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Sample records for north-end orebody rosebery

  1. The North End Boston.

    ERIC Educational Resources Information Center

    Connally, Nicole; And Others

    Goals and objectives, student activities, and evaluations are contained in this guide for a one-day scavenger hunt through the North End of Boston. The culmination of a unit involving urban planning and land-use problems, the field trip is intended to give students first-hand experience with city life and a better understanding of urban issues…

  2. Mine Planning for Asteroid Orebodies

    NASA Astrophysics Data System (ADS)

    Gertsch, L. S.; Gertsch, R. E.

    2000-01-01

    Given that an asteroid (or comet) has been determined to contain sufficient material of value to be potentially economic to exploit, a mining method must be selected and implemented. This paper discusses the engineering necessary to bring a mine online, and the opportunities and challenges inherent in asteroid mineral prospects. The very important step of orebody characterization is discussed elsewhere. The mining methods discussed here are based on enclosing the asteroid within a bag in some fashion, whether completely or partially. In general, asteroid mining methods based on bags will consist of the following steps. Not all will be required in every case, nor necessarily in this particular sequence. Some steps will be performed simultaneously. Their purpose is to extract the valuable material from the body of the asteroid in the most efficient, cost-effective manner possible. In approximate order of initiation, if not of conclusion, the steps are: 1. Tether anchoring to the asteroid. 2. Asteroid motion control. 3. Body/fragment restraint system placement. 4. Operations platform construction. 5. Bag construction. 6. Auxiliary and support equipment placement. 7. Mining operations. 8. Processing operations. 9. Product transport to markets.

  3. 25. DETAIL VIEW OF COMMEMORATIVE NAMEPLATE PLAQUE, NORTH END SPAN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. DETAIL VIEW OF COMMEMORATIVE NAMEPLATE PLAQUE, NORTH END SPAN - East Bloomsburg Bridge, Spanning Susquehanna River at Pennsylvania Route 487 (Legislative Route 283), Bloomsburg, Columbia County, PA

  4. 14. DETAIL VIEW OF COMMEMORATIVE PLAQUE AND FINIAL, NORTH END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. DETAIL VIEW OF COMMEMORATIVE PLAQUE AND FINIAL, NORTH END SPAN - East Bloomsburg Bridge, Spanning Susquehanna River at Pennsylvania Route 487 (Legislative Route 283), Bloomsburg, Columbia County, PA

  5. BLDG 1 REAR (EAST) AND NORTH END Naval Magazine ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    BLDG 1 REAR (EAST) AND NORTH END - Naval Magazine Lualualei, Headquarters Branch, Administration Building, Between Constitution & Constellation Streets, east side of main quad, Pearl City, Honolulu County, HI

  6. 4. NORTH END OF TERMINAL ROOM, SHOP LEVEL SHOWING SPIRAL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. NORTH END OF TERMINAL ROOM, SHOP LEVEL SHOWING SPIRAL STAIR TO CABLE RACK. Looking north. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  7. 26. Aerial photograph dated 20 June 1942, showing north end ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    26. Aerial photograph dated 20 June 1942, showing north end of Gould Island from the southwest. At upper left is firing pier. Shop building and power plant under construction at center. Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  8. 5. EXTERIOR OF NORTH END OF BUILDINT 104 SHOWING WOODSIDED ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. EXTERIOR OF NORTH END OF BUILDINT 104 SHOWING WOODSIDED BEDROOM ADDITION TO FRONT OF HOUSE, AND SMALL GABLE ROOF OVER FORMER BATHROOM PROJECTION ON NORTH END OF HOUSE. VIEW TO SOUTH. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  9. Anomalous orebody within the Ambrosia Lake trend at Sandstone Mine

    SciTech Connect

    Foster, J.F.; Quintanar, R.J.

    1980-01-01

    The Sandstone Mine contains an anomalous orebody that lacks the characteristic coloring and high gamma-ray expression typically associated with uranium ore in the Ambrosia Lake district. The orebody occurs at the downdip edge of a tongue of hematitic sand in the basal sand unit of the Westwater Canyon Member of the Morrison Formation. The orebody ranges from white to light gray in color. Preliminary analysis indicates the presence of uranophane (Ca(UO/sub 2/)/sub 2/SiO/sub 3/(OH)/sub 2/.5H/sub 2/O), evidently altered from coffinite, which is the predominant uranium mineral in the district. Equivalent U/sub 3/O/sub 8/ indicates that this orebody is relatively recent. Oxidizing meteoric water, which formed a geochemical cell, remobilized uranium minerals in preexisting trend orebodies and deposited the uranium downdip of the furthest extent of this cell. Post-Dakota deformation influenced the course of the migrating meteoric water and the extent of the redox interface controlling the orebody. As sampling and mining lower grades of uranium becomes increasingly more economical, the potential for unknown reserves adjacent to the redox interface should not be overlooked.

  10. 9. Interior of 'Pavilion Lounge' at north end of Second ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Interior of 'Pavilion Lounge' at north end of Second Grandstand, showing vaulted ceilings, bar and spider chandelier. (May 1993) - Longacres, Second Grandstand, 1621 Southwest Sixteenth Street, Renton, King County, WA

  11. Feature 6, removed culvert north end to south very little ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Feature 6, removed culvert north end to south very little showing due to vegetation - Victory Highway, One Mile Segment West of West Wendover and South of Interstate 80, West Wendover, Elko County, NV

  12. 4. SANDY RIVER BRIDGE AT TROUTDALE, NORTH END, LOOKING 224 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. SANDY RIVER BRIDGE AT TROUTDALE, NORTH END, LOOKING 224 DEGREES SOUTHWEST. - Historic Columbia River Highway, Sandy River Bridge at Troutdale, Historic Columbia River Highway spanning Sandy River, Troutdale, Multnomah County, OR

  13. 3. SANDY RIVER BRIDGE AT TROUTDALE, NORTH END, LOOKING 184 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. SANDY RIVER BRIDGE AT TROUTDALE, NORTH END, LOOKING 184 DEGREES SOUTH. SAME PHOTO AS OR-36-2. - Historic Columbia River Highway, Sandy River Bridge at Troutdale, Historic Columbia River Highway spanning Sandy River, Troutdale, Multnomah County, OR

  14. Looking South at North End of Rod Loading Line Including ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Looking South at North End of Rod Loading Line Including Welding Area Within Rod Loading building - Hematite Fuel Fabrication Facility, Rod Loading Building, 3300 State Road P, Festus, Jefferson County, MO

  15. 19. GENERAL VIEW OF EMPLOYEES' LOCKER ROOM AT NORTH END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. GENERAL VIEW OF EMPLOYEES' LOCKER ROOM AT NORTH END OF LEVEL 3; LOOKING NORTHWEST - Rath Packing Company, Beef Killing Building, Sycamore Street between Elm & Eighteenth Streets, Waterloo, Black Hawk County, IA

  16. J SERIES MAGAZINE. J 107 NORTH END AND REAR (EAST). ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    J SERIES MAGAZINE. J 107 NORTH END AND REAR (EAST). J 106-103 IN BACKGROUND. - Naval Magazine Lualualei, Headquarters Branch, Inert Storehouse Type, Twelfth Street between Kwajulein & New Mexico Streets, Pearl City, Honolulu County, HI

  17. J SERIES MAGAZINE. #J107 FRONT (WEST) AND NORTH END. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    J SERIES MAGAZINE. #J107 FRONT (WEST) AND NORTH END. - Naval Magazine Lualualei, Headquarters Branch, Inert Storehouse Type, Twelfth Street between Kwajulein & New Mexico Streets, Pearl City, Honolulu County, HI

  18. Oblique of north end and west side, brig is in ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Oblique of north end and west side, brig is in background to the right - U.S. Naval Base, Pearl Harbor, United States All-Steel Hangar, Wasp Boulevard between Kingfisher Street and Ranger Loop, Pearl City, Honolulu County, HI

  19. 23. STEAM PLANT TURBINE DECK FROM NORTH END OF BUILDING, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. STEAM PLANT TURBINE DECK FROM NORTH END OF BUILDING, SHOWING FOURTH STEAM UNIT IN PLACE AT FAR SOUTH END. April 6, 1950 - Crosscut Steam Plant, North side Salt River near Mill Avenue & Washington Street, Tempe, Maricopa County, AZ

  20. 5. EXTERIOR ELEVATION OF NORTH END OF EAST FACADE OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. EXTERIOR ELEVATION OF NORTH END OF EAST FACADE OF STEAM PLANT, BUILDING 740, LOOKING WEST. - Oakland Naval Supply Center, Steam Plant, Sixth Street south of East K Street, Oakland, Alameda County, CA

  1. 1. WEST SIDE, NORTH END OF BUILDING 1. SHOWS ADDITIONAL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. WEST SIDE, NORTH END OF BUILDING 1. SHOWS ADDITIONAL ANGLES IN BUILDING AT SOUTHERN END. - Chollas Heights Naval Radio Transmitting Facility, Transmitter Building, 6410 Zero Road, San Diego, San Diego County, CA

  2. INTERIOR DETAIL OF SECOND FLOOR DOORS AT NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    INTERIOR DETAIL OF SECOND FLOOR DOORS AT NORTH END OF BUILDING; CAMERA FACING NORTH - Mare Island Naval Shipyard, Transportation Building & Gas Station, Third Street, south side between Walnut Avenue & Cedar Avenue, Vallejo, Solano County, CA

  3. DETAIL OF FIRST STORY WINDOWS ON NORTH END OF EAST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL OF FIRST STORY WINDOWS ON NORTH END OF EAST ELEVATION; CAMERA FACING WEST. - Mare Island Naval Shipyard, Transportation Building & Gas Station, Third Street, south side between Walnut Avenue & Cedar Avenue, Vallejo, Solano County, CA

  4. INTERIOR VIEW OF FIRST FLOOR SPACE AT NORTH END, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    INTERIOR VIEW OF FIRST FLOOR SPACE AT NORTH END, LOOKING AT WEST WALL; CAMERA FACING NORTHWEST. - Mare Island Naval Shipyard, Transportation Building & Gas Station, Third Street, south side between Walnut Avenue & Cedar Avenue, Vallejo, Solano County, CA

  5. INTERIOR VIEW OF SECOND STORY SPACE, NORTH END OF BUILDING; ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    INTERIOR VIEW OF SECOND STORY SPACE, NORTH END OF BUILDING; CAMERA FACING SOUTHEAST. - Mare Island Naval Shipyard, Transportation Building & Gas Station, Third Street, south side between Walnut Avenue & Cedar Avenue, Vallejo, Solano County, CA

  6. 13. Interior, storage room of depot located at north end, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. Interior, storage room of depot located at north end, looking northeast from southwest corner of room - Missouri Pacific Railway Depot, Natches Street (State Highway 15) & Pine Street intersection, northeast corner, Wisner, Franklin Parish, LA

  7. 12. Interior, storage room of depot located at north end, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. Interior, storage room of depot located at north end, looking south - Missouri Pacific Railway Depot, Natches Street (State Highway 15) & Pine Street intersection, northeast corner, Wisner, Franklin Parish, LA

  8. 11. Detail view of the north end of the east ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. Detail view of the north end of the east elevation highlighting the fluted tile door surround of the northeast entrance - Arlington Realty Building, 2300 North Wilson Boulevard, Arlington, Arlington County, VA

  9. 8. View toward the northeast at the north end of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. View toward the northeast at the north end of the eastern segment of the north roundhouse. (Numbers 58, 59, and 60 are visible.) - Central Railroad of New Jersey, Engine Terminal, Jersey City, Hudson County, NJ

  10. GENERAL AERIAL VIEW OF NORTH END OF LAKE ALDWELL (RESERVOIR) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL AERIAL VIEW OF NORTH END OF LAKE ALDWELL (RESERVOIR) WITH ELWHA DAM AND POWERHOUSE. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

  11. 1. PERSPECTIVE VIEW OF THE NORTH END AND WEST SIDE, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. PERSPECTIVE VIEW OF THE NORTH END AND WEST SIDE, LOOKING SOUTHEAST FROM A BOAT. BUILDING NO. 14 IS VISIBLE AT THE EXTREME RIGHT. - United Engineering Company Shipyard, Pier 4, 2900 Main Street, Alameda, Alameda County, CA

  12. Detail, north end of console and pneumatic tube message port, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, north end of console and pneumatic tube message port, also showing mirror to reflect view of communications switchboard - March Air Force Base, Strategic Air Command, Combat Operations Center, 5220 Riverside Drive, Moreno Valley, Riverside County, CA

  13. 3. Perspective view of north end of Bunker 103 showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Perspective view of north end of Bunker 103 showing north set of steel doors. Camera pointed NW. - Puget Sound Naval Shipyard, Munitions Storage Bunker, Naval Ammunitions Depot, North of Campbell Trail, Bremerton, Kitsap County, WA

  14. 2. Elevation view of north end of Bunker 104 showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Elevation view of north end of Bunker 104 showing steps and slope of earthen roof. Camera pointed W. - Puget Sound Naval Shipyard, Munitions Storage Bunker, Naval Ammunitions Depot, South of Campbell Trail, Bremerton, Kitsap County, WA

  15. Detail, exterior side of doubleplanked north end, Burton Park Club ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, exterior side of double-planked north end, Burton Park Club House, view to south-southwest (135mm lens). - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

  16. Oblique view, north end and west side, Burton Park Club ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Oblique view, north end and west side, Burton Park Club House, view to south (90mm lens). - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

  17. 1. DEDICATION PLAQUE ENTITLED FIVE MILE VIADUCT ON NORTH END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. DEDICATION PLAQUE ENTITLED FIVE MILE VIADUCT ON NORTH END OF BRIDGE. - U.S. Route 78 Bridge (Five Mile Viaduct), U.S. Route 78 spanning CSX Railroad & Meeting Street (S-39), North Charleston, Charleston County, SC

  18. Detail view of the north end of the west elevation ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail view of the north end of the west elevation to show entrance (Duplicate view of HABS DC-833-6) - Ambassador Bruce House, 1422 Thirty-Fifth Street, Northwest, Washington, District of Columbia, DC

  19. Perspective view of the north end of the west elevation, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Perspective view of the north end of the west elevation, looking northwest to southeast (Duplicate view of HABS DC-833-4) - Ambassador Bruce House, 1422 Thirty-Fifth Street, Northwest, Washington, District of Columbia, DC

  20. View of North End of Oxide Building Interior Including Roof ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of North End of Oxide Building Interior Including Roof and Wall Juncture and Crane Trolley - Hematite Fuel Fabrication Facility, Oxide Building & Oxide Loading Dock, 3300 State Road P, Festus, Jefferson County, MO

  1. 27. AVENUE OF THE GIANTS SIGN AT NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. AVENUE OF THE GIANTS SIGN AT NORTH END OF ROAD. PEPPERWOOD, HUMBOLDT COUNTY, CALIFORNIA. LOOKING S. - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City, Del Norte County, CA

  2. Detail, east side, north end, showing door and overhead rail ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, east side, north end, showing door and overhead rail for refrigeration room. - Fitzsimons General Hospital, Ice Plant, Southwest Corner of East I Avenue & North Thirteenth Street, Aurora, Adams County, CO

  3. 21. FOLDING DOORS AT RAIL SPUR ENTRANCE TO NORTH END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. FOLDING DOORS AT RAIL SPUR ENTRANCE TO NORTH END OF PLANT. VIEW TO EAST. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  4. 20. OFFICE AT NORTH END OF SECOND FLOOR, ADMINISTRATIVE OFFICES ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. OFFICE AT NORTH END OF SECOND FLOOR, ADMINISTRATIVE OFFICES SECTION. VIEW TO SOUTHEAST. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  5. 23. LUNCH ROOM ALONGSIDE SUNKEN RAIL SPUR, NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. LUNCH ROOM ALONGSIDE SUNKEN RAIL SPUR, NORTH END OF PLANT. VIEW TO NORTH-NORTHEAST. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  6. 10. VIEW OF NORTH END SPAN, SHOWING FLOOR BEAM AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. VIEW OF NORTH END SPAN, SHOWING FLOOR BEAM AND STRINGERS AT PANEL POINT L1 - East Bloomsburg Bridge, Spanning Susquehanna River at Pennsylvania Route 487 (Legislative Route 283), Bloomsburg, Columbia County, PA

  7. 8. VIEW, LOOKING SOUTHWEST, SHOWING NORTH END SPAN, SIDE AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. VIEW, LOOKING SOUTHWEST, SHOWING NORTH END SPAN, SIDE AND FLOOR SYSTEM - East Bloomsburg Bridge, Spanning Susquehanna River at Pennsylvania Route 487 (Legislative Route 283), Bloomsburg, Columbia County, PA

  8. Interior detail of bathroom on first floor north end, west ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior detail of bathroom on first floor north end, west side, camera facing west. - Mare Island Naval Shipyard, WAVES Officers Quarters, Cedar Avenue, west side between Tisdale Avenue & Eighth Street, Vallejo, Solano County, CA

  9. 12. INTERIOR OF NORTH END ENCLOSED SCREEN PORCH. DOUBLE FRENCH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. INTERIOR OF NORTH END ENCLOSED SCREEN PORCH. DOUBLE FRENCH DOORS LEAD TO BEDROOM #3. VIEW TO EAST. - Big Creek Hydroelectric System, Powerhouse 8, Operator Cottage, Big Creek, Big Creek, Fresno County, CA

  10. Interior view of north end of the Bagasse Storage Building ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior view of north end of the Bagasse Storage Building with traveling crane used to load bagasse to send to boiler, looking from the west - Kekaha Sugar Company, Bagasse Storage Building, 8315 Kekaha Road, Kekaha, Kauai County, HI

  11. 14. VIEW TO SOUTHWEST AT NORTH END OF SECONDFLOOR ASSEMBLY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. VIEW TO SOUTHWEST AT NORTH END OF SECOND-FLOOR ASSEMBLY AREA. VIEW SHOWS DETAILS OF SAWTOOTH ROOF STRUCTURE. - Rosie the Riveter National Historical Park, Ford Assembly Plant, 1400 Harbour Way South, Richmond, Contra Costa County, CA

  12. 17. WEST (FRONT) PORCH, VIEWED FROM NORTH END TOWARDS THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. WEST (FRONT) PORCH, VIEWED FROM NORTH END TOWARDS THE SOUTH A. C. Eschete, photographer, September 24, 1977 - Bagatelle Plantation, East River Road (moved to Iberville Parish), Donaldsonville, Ascension Parish, LA

  13. 35. NORTH END OF BALTIMOREWASHINGTON PARKWAY, WHERE MARYLAND HIGHWAY 295, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    35. NORTH END OF BALTIMORE-WASHINGTON PARKWAY, WHERE MARYLAND HIGHWAY 295, "THE BALTIMORE-WASHINGTON EXPRESSWAY," BEGINS, MARYLAND HIGHWAY 175 IN BACKGROUND. VIEWN. - Baltimore-Washington Parkway, Greenbelt, Prince George's County, MD

  14. 5. EXTERIOR OF NORTH END OF BUILDING 105 SHOWING 1946 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. EXTERIOR OF NORTH END OF BUILDING 105 SHOWING 1946 BEDROOM ADDITION. BUILDING 108 IS VISIBLE AT EXTREME PHOTO LEFT. VIEW TO SOUTHEAST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  15. 6. INTERIOR DETAIL OF WINDOW IN EAST WALL NORTH END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. INTERIOR DETAIL OF WINDOW IN EAST WALL NORTH END ROOM. BUILDING 4 IS VISIBLE THROUGH WINDOW. - Chollas Heights Naval Radio Transmitting Facility, Recreation Building, 6410 Zero Road, San Diego, San Diego County, CA

  16. 19. DETAIL, METAL LIGHT STANDARD, AT NORTH END BLOCK OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. DETAIL, METAL LIGHT STANDARD, AT NORTH END BLOCK OF EAST PARAPET, FROM WEST, SHOWING SIMPLE ORNAMENTATION OF BASE OF STANDARD, WITH 'UNION METAL' IMPRINT - Fifth Street Viaduct, Spanning Bacon's Quarter Branch Valley on Fifth Street, Richmond, Independent City, VA

  17. 222. NORTH END OF DIVIDING STRIP LOCATED NEAR LITTLE HUNTING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    222. NORTH END OF DIVIDING STRIP LOCATED NEAR LITTLE HUNTING CREEK ON GWMP LOOKING SOUTH, 1946. - George Washington Memorial Parkway, Along Potomac River from McLean to Mount Vernon, VA, Mount Vernon, Fairfax County, VA

  18. 6. Main Control Switchboard (north end interior), view to the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Main Control Switchboard (north end interior), view to the southwest. - Washington Water Power Clark Fork River Noxon Rapids Hydroelectric Development, Powerhouse, South bank of Clark Fork River at Noxon Rapids, Noxon, Sanders County, MT

  19. 6. NORTH END OF MACHINE SHOP. FORGE SHOP (HAER No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. NORTH END OF MACHINE SHOP. FORGE SHOP (HAER No. CA-326-K) ON LEFT, FORD PLANT IN DISTANCE, NE BY 60. - Rosie the Riveter National Historical Park, Machine Shop, 1311 Canal Boulevard, Richmond, Contra Costa County, CA

  20. BLDG A 101, FRONT (EAST) AND NORTH END SHOWING EXTERIOR ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    BLDG A 101, FRONT (EAST) AND NORTH END SHOWING EXTERIOR STAIR TO 2ND FLOOR AND PALM TREE. - Naval Magazine Lualualei, Headquarters Branch, Operational Storage Building, Thirteenth Street near Franklin Street intersection, Pearl City, Honolulu County, HI

  1. 8. West side of north end of bridge resting on ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. West side of north end of bridge resting on approach abutment. Oblique detail view northeast (from below roadbed level, beside bridge). 150 mm lens. - Gault Bridge, Spanning Deer Creek at South Pine Street, Nevada City, Nevada County, CA

  2. VIEW OF MACHINE SHOP STORAGE OPENINGS, NORTH END OF BARN, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW OF MACHINE SHOP STORAGE OPENINGS, NORTH END OF BARN, LOOKING SOUTH (This northern-most facade of the barn was originally a board and batten wall with two sliding doors. In the early decades of the twentieth century Frederick Edward Arnold moved the wall and doors; they now make up the north end of bay 3. This was done to ease machine storage) - Arnold Farm, Barn, 1948 Arnold Road, Coupeville, Island County, WA

  3. 25. Aerial photograph dated 20 June 1942, showing north end ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Aerial photograph dated 20 June 1942, showing north end of Gould Island from the northeast (caption on photo is in error). Shop and power plant under construction at left, firing pier under construction at far right. Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  4. Orebody Modelling for Exploration: The Western Mineralisation, Broken Hill, NSW

    SciTech Connect

    Lotfolah Hamedani, Mohammad Plimer, Ian Rutherford; Xu Chaoshui

    2012-09-15

    The Western Mineralisation in the Broken Hill deposit was studied to identify the zonation sequence of lithogeochemical haloes along and across the strike of the orebody. Samples used are from 77 drill holes and the samples were assayed for Pb, Zn, Fe, S, Cu, Ag, Cd, Sb, Bi and As. Variogram analyses were calculated for all the elements and kriging was used to construct the 3D block model. Analysis of cross sections along and across the strike of the orebody shows that Bi and Sb form broader halos around sulphide masses and this suggests that they are pathfinder elements for the Pb and Zn elements of this orebody. The threshold concentrations (minimum anomaly) of the 10 elements were determined using the concentration-area analysis. On east-west vertical cross sections, the values of linear productivity, variability gradient and zonality index were calculated for each element. Based on the maximum zonality index of each element, the sequence of geochemical zonation pattern was determined from top to bottom of the orebody. The result shows that S, Pb, Zn and Cd tend to concentrate in the upper part of the mineralisation whereas Ag, Cu, Bi and As have a tendency to concentrate in the lower part of the mineralised rocks. Also, an empirical product ratio index was developed based on the position of the elements in the zonation sequence. The methods and results of this research are applicable to exploration of similar Zn and Pb sulphide ore deposits.

  5. 31. Interior view, north end of the west wall looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    31. Interior view, north end of the west wall looking at the section between the front door and the northwestern corner of the building, with scale (note position of post fire partition wall and floor joists as recorded in the brickwork) - Kiskiack, Naval Mine Depot, State Route 238 vicinity, Yorktown, York County, VA

  6. Interior, north end, upper level, looking south towards door to ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior, north end, upper level, looking south towards door to one of the building's refrigeration rooms. Photograph taken just south of CO-172-AQ-4. - Fitzsimons General Hospital, Ice Plant, Southwest Corner of East I Avenue & North Thirteenth Street, Aurora, Adams County, CO

  7. Interior, north end, upper level, looking west. This photograph taken ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior, north end, upper level, looking west. This photograph taken inside the refrigeration room whose door is in the background of CO-172-AQ-5. - Fitzsimons General Hospital, Ice Plant, Southwest Corner of East I Avenue & North Thirteenth Street, Aurora, Adams County, CO

  8. 55. Aerial view looking north; end of openwater section of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    55. Aerial view looking north; end of open-water section of Dundee Canal at bottom, Botany Worsted Mills at center - Dundee Canal Industrial Historic District, Beginning at George Street in Passaic & extending north along Dundee Canal approximately 1.2 miles to Canal headgates opposite East Clifton Avenue in Clifton, Passaic, Passaic County, NJ

  9. 62. May 1985. NORTH END OF WASH HOUSE (Negative slightly ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    62. May 1985. NORTH END OF WASH HOUSE (Negative slightly reticulated. Tree behind fence is common fig, Ficus carica.) - Borough House, West Side State Route 261, about .1 mile south side of junction with old Garners Ferry Road, Stateburg, Sumter County, SC

  10. 6. VIEW OF NORTH END OF EAST DAM, LOOKING SOUTH. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF NORTH END OF EAST DAM, LOOKING SOUTH. (View is taken from lakeside with lowered water level. This view encompasses the same area as MT-88-A-5 above.) - Three Bears Lake & Dams, East Dam, North of Marias Pass, East Glacier Park, Glacier County, MT

  11. 18. John N. Vogel, Photographer, August 1992 NORTH END COUNTERWEIGHT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. John N. Vogel, Photographer, August 1992 NORTH END COUNTERWEIGHT PIT. VIEW TO EAST SOUTHEAST. STEP UP GEARS AT LEAST END OF MAIN DRIVE SHAFT GEAR (LOWER LEFT) - Tayco Street Bridge, Spanning Government Canal at Tayco & Water Streets, Menasha, Winnebago County, WI

  12. 9. Elevation view of north end of west wall of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Elevation view of north end of west wall of South Section. Bulkhead is visible on right. This photo makes an extended elevation panorama with photo WA-116-E-7 and WA-116-E-8. - Puget Sound Naval Shipyard, Drydock No. 3, Farragut Avenue, Bremerton, Kitsap County, WA

  13. 6. INTERIOR OF NORTH END OF STEAM PLANT, GROUND FLOOR, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. INTERIOR OF NORTH END OF STEAM PLANT, GROUND FLOOR, SHOWING FORMER LOCATION OF DIESEL ENGINES. THIS WAS THE FIRST PART OF THE BUILDING TO BE CONSTRUCTED, WHEN IT HOUSED ONLY THE DIESEL ENGINES. December 4, 1990 - Crosscut Steam Plant, North side Salt River near Mill Avenue & Washington Street, Tempe, Maricopa County, AZ

  14. 83. GENERAL VIEW FROM NORTH END OF GUN HILL PLATFORM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    83. GENERAL VIEW FROM NORTH END OF GUN HILL PLATFORM OF 3RD AVENUE EL SHOWING THE SOUTHBOUND TRACK APPROACH INTO GUN HILL STATION. 7TH AVENUE EXPRESS EL ABOVE. - Interborough Rapid Transit Company, Third Avenue Elevated Line, Borough of the Bronx, New York County, NY

  15. 13. Concrete stairs at north end of east wall of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. Concrete stairs at north end of east wall of South Section, as viewed from floor of drydock. Depth measure on far left is same as in photo WA-116-E-12. Camera is pointed E. This photo makes a panorama with photo WA-116-E-3. - Puget Sound Naval Shipyard, Drydock No. 3, Farragut Avenue, Bremerton, Kitsap County, WA

  16. 16. EXTERIOR NORTH END OF TULE RIVER POWERHOUSE SHOWING POWERHOUSE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. EXTERIOR NORTH END OF TULE RIVER POWERHOUSE SHOWING POWERHOUSE AT PHOTO CENTER, SUBSTATION AT PHOTO RIGHT FOREGROUND, OFFICE BEHIND SUBSTATION AT RIGHT OF POWERHOUSE, AND MACHINE SHOP AT LEFT OF POWERHOUSE. THIS PHOTOGRAPH DUPLICATES HISTORIC VIEW SHOWN IN PHOTO CA-216-17. VIEW TO SOUTHEAST. - Tule River Hydroelectric Project, Water Conveyance System, Middle Fork Tule River, Springville, Tulare County, CA

  17. 1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING BUILDING 108 AT PHOTO RIGHT AND BUILDING 105 AT PHOTO CENTER BEHIND TREE. RUSH CREEK POWERHOUSE IS PARTIALLY VISIBLE AT EXTREME PHOTO LEFT). VIEW TO WEST. - Rush Creek Hydroelectric System, Clubhouse Cottage, Rush Creek, June Lake, Mono County, CA

  18. Facility 136, oblique view of east side and north end ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Facility 136, oblique view of east side and north end with entry door, electrical panel with soda bottles, view facing west - U.S. Naval Base, Pearl Harbor, Latrines, Off Avenue C, at Repair Basins B13, B15-B18 & B20, Pearl City, Honolulu County, HI

  19. Oblique view of north end and east side, taken from ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Oblique view of north end and east side, taken from back side of bus stop, with stair to Facility 2 in foreground, view facing southwest - U.S. Naval Base, Pearl Harbor, Passenger Shelter, Seventh Street near Avenue F intersection, Pearl City, Honolulu County, HI

  20. Detail, north end wall, Burton Park Amphitheater, view to southwest ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, north end wall, Burton Park Amphitheater, view to southwest (90mm lens). Also visible are pilasters along back wall, east wing of stage area (within doorway), and east steps. Walls are adobe brick, with concrete coping. - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

  1. Detail, interior side of doubleplanked door, north end, Burton Park ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, interior side of double-planked door, north end, Burton Park Club House, view to east-southeast (135mm lens). Note diagonal sheathing of interior surface, wrought-iron strap hinges. - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

  2. 10. INTERIOR OF ATTIC, VIEW FROM NORTH END LOOKING SOUTHEAST. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. INTERIOR OF ATTIC, VIEW FROM NORTH END LOOKING SOUTHEAST. NOTE ENTRANCE TO NORTH STAIR TOWER ON LEFT. THE HEAVY TIMBER TRUSS SYSTEM IS VISIBLE ALONG RIGHT SIDE OF PHOTOGRAPH. THIS SPACE WAS USED FOR PRODUCTION THROUGHOUT THE HISTORY OF THE MILL. - Graniteville Mill, Marshall Street, Graniteville, Aiken County, SC

  3. OVERVIEW OF THE NORTH END OF FACILITY NO. S 20. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    OVERVIEW OF THE NORTH END OF FACILITY NO. S 20. NOTE THE RIGHT-ANGLE SECTION OF THE WHARF AT THE LEFT WHERE FACILITY NO. S 20 JOINS FACILITY NO. S 19. VIEW FACING EAST - U.S. Naval Base, Pearl Harbor, Floating Dry Dock Quay, Hurt Avenue at northwest side of Magazine Loch, Pearl City, Honolulu County, HI

  4. 18. DETAIL OF NORTH END OF ATLAS CONTROL CONSOLE NEAR ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. DETAIL OF NORTH END OF ATLAS CONTROL CONSOLE NEAR WEST WALL OF SLC-3W CONTROL ROOM SHOWING PAYLOAD ENVIRONMENT CONTROL AND MONITORING PANELS (LABELED 'PECMP') - Vandenberg Air Force Base, Space Launch Complex 3, Launch Operations Building, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  5. Facility 136, view of north end, "No Smoking" sign, view ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Facility 136, view of north end, "No Smoking" sign, view facing south-southwest - U.S. Naval Base, Pearl Harbor, Latrines, Off Avenue C, at Repair Basins B13, B15-B18 & B20, Pearl City, Honolulu County, HI

  6. 8. DETAIL OF NORTH END OF EAST TRUSS, SHOWING END ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. DETAIL OF NORTH END OF EAST TRUSS, SHOWING END POST, TOP AND LOWER CHORDS, AND DIAGONAL EYE BARS, SEEN FROM NORTHEAST. - Mitchell's Mill Bridge, Spanning Winter's Run on Carrs Mill Road, west of Bel Air, Bel Air, Harford County, MD

  7. 5. Elevation view of north end of east wall of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. Elevation view of north end of east wall of South Section, as viewed from atop pier. On far left is bulkhead, depth measure stick and old concrete stairs. Camera is pointed E from a position slightly to the right (south) of photo WA-116-E-4. - Puget Sound Naval Shipyard, Drydock No. 3, Farragut Avenue, Bremerton, Kitsap County, WA

  8. View of plate girder spans at north end, looking west ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View of plate girder spans at north end, looking west from beneath state route 18 bridge (which lies along previous alignment of Pittsburgh, Fort Wayne & Chicago Railway). - Pittsburgh, Fort Wayne & Chicago Railway, Beaver River Bridge, Spanning Beaver River along line of Second Avenue, New Brighton, Beaver County, PA

  9. 5. HOUSE NORTH END EXTERIOR SHOWING ASBESTOS SIDING, CONCRETE WALKWAY ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. HOUSE NORTH END EXTERIOR SHOWING ASBESTOS SIDING, CONCRETE WALKWAY TO REAR OF HOUSE, CLOSELINE SUPPORT AT EXTREME PHOTO RIGHT, AND CASEMENT WINDOW TO ATTIC JUST BELOW THE GABLE PEAK. VIEW TO SOUTHWEST. - Big Creek Hydroelectric System, Big Creek Town, Operator House, Orchard Avenue south of Huntington Lake Road, Big Creek, Fresno County, CA

  10. Interior view of north end of first floor of Express ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior view of north end of first floor of Express Building Mail Room, facing east. Toilet rooms are on right, and Lunch Room with surveillance gallery above it is on left. Enclosed stairs is at back of photograph - Southern Pacific Railroad Depot, Railroad Terminal Post Office & Express Building, Fifth & I Streets, Sacramento, Sacramento County, CA

  11. Interior of north end entry, piping on upper left, steel ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior of north end entry, piping on upper left, steel door, bare bulb top center, view facing south-southwest - U.S. Naval Base, Pearl Harbor, Operations & Message Center, Behind Facility No. 1, corner of Avenue E & Seventh Street, connected to Facility Nos. 1B & 1D by wooden bridges, Pearl City, Honolulu County, HI

  12. 3. OVERVIEW LOOKING EAST: taken from north end BLDG. 1. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. OVERVIEW LOOKING EAST: taken from north end BLDG. 1. - Fafnir Bearing Plant, Bounded on North side by Myrtle Street, on South side by Orange Street, on East side by Booth Street & on West side by Grove Street, New Britain, Hartford County, CT

  13. 7. Oblique view southeast of north end of building. Scale ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. Oblique view southeast of north end of building. Scale visible adjacent to door at lower right. Compare to HABS-CA-2611-B-4. - Deetjen's Big Sur Inn, Hayloft Building, East Side of State Highway 1, Big Sur, Monterey County, CA

  14. NORTH END OF DOUBLE FURNACE AND CAST AND ENGINE SHED, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    NORTH END OF DOUBLE FURNACE AND CAST AND ENGINE SHED, WITH BLOWER HOUSE TO THE EAST AND CHARGING BRIDGE AND TRESSLE TO THE WEST, LOOKING SOUTH-SOUTHEAST. - Tannehill Furnace, 12632 Confederate Parkway, Tannehill Historical State Park, Bucksville, Tuscaloosa County, AL

  15. DETAIL OF "FEET" OF MAIN TRUSS NORTH END. NOTE PLATES ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL OF "FEET" OF MAIN TRUSS NORTH END. NOTE PLATES ON WHICH FEET REST ALLOWING EXPANSION OF TRUSS AS IT EXPANDS AND SHRINKS UNDER THE SUN - Missouri & North Arkansas Railroad Bridge, Spanning Middle Fork Little Red River, Shirley, Van Buren County, AR

  16. 2. EXTERIOR NORTH END OF BUILDING 103 SHOWING PAVED PARKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. EXTERIOR NORTH END OF BUILDING 103 SHOWING PAVED PARKING AREA BETWEEN BUILDING 103 AND BUILDING 104, AND WALKWAY TO FRONT (EAST SIDE) ENTRY OF HOUSE. VIEW TO SOUTHEAST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  17. 1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING BUILDING 108 AT PHOTO RIGHT AND BUILDING 105 AT PHOTO CENTER BEHIND SWITCHRACKS AND TREE. POWERHOUSE IS AT EXTREME PHOTO LEFT. VIEW TO WEST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  18. Detail of north end of the Electrical Shop (foreground) and ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail of north end of the Electrical Shop (foreground) and Sheet Metal Shop, note the metal-frame windows in the Electrical Shop, view facing east - Kahului Cannery, Plant No. 28, Boiler House, Sheet Metal and Electrical Shops, 120 Kane Street, Kahului, Maui County, HI

  19. 12. VIEW OF THE NORTH END, STATION 'L', FROM THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. VIEW OF THE NORTH END, STATION 'L', FROM THE ROOF OF POWERHOUSE EXTENSION (BUILDING L5), WELDING SHOP (BUILDING F) IN FOREGROUND, PEPCO BUILDING (BUILDING A) IN BACKGROUND - Portland General Electric Company, Station "L", 1841 Southeast Water Street, Portland, Multnomah County, OR

  20. Interior, north end of building, looking north. At left is ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior, north end of building, looking north. At left is the threading machine and the cutout in the wall for a long tube in the machine is on the north wall beyond the machine. - Fitzsimons General Hospital, Shops Building, Northwest Corner of West Pennington Avenue, & North Tenth Street, Aurora, Adams County, CO

  1. VIEW OF PIEDMONT AVENUE NEAR NORTH END OF STADIUM. SEEN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW OF PIEDMONT AVENUE NEAR NORTH END OF STADIUM. SEEN FROM EAST SIDE OF PIEDMONT LOOKING SOUTH. Photograph by Brian Grogan, July 8, 2007 - Piedmont Way & the Berkeley Property Tract, East of College Avenue between Dwight Way & U.C. Memorial Stadium, Berkeley, Alameda County, CA

  2. NORTH END OF PIEDMONT AVENUE. STADIUM AT LEFT REAR. SEEN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    NORTH END OF PIEDMONT AVENUE. STADIUM AT LEFT REAR. SEEN FROM WEST SIDE OF PIEDMONT LOOKING SE. Photograph by Brian Grogan, July 8, 2007 - Piedmont Way & the Berkeley Property Tract, East of College Avenue between Dwight Way & U.C. Memorial Stadium, Berkeley, Alameda County, CA

  3. VIEW TO EAST OF THE NORTH END OF BASIN NO. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW TO EAST OF THE NORTH END OF BASIN NO. 1 (THE WESTERN-MOST BASIN) SHOWING THE CRANEWAY AND GALLERY BETWEEN BASINS NO. 1 AND 2. BASSWOOD BUOY TENDER AND THREE SMALL VESSELS ARE BERTHED IN BASIN NO. 1. LARGER VESSELS ARE BERTHED IN BASINS TO THE EAST, SEEN IN BACKGROUND - Rosie the Riveter National Historical Park, Graving Docks, Shipyard No. 3, Richmond, Contra Costa County, CA

  4. 1. Streetscape of north ends of Detention Wards, Building Nos. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. Streetscape of north ends of Detention Wards, Building Nos. 9946-B (left) and 9945-B (middle). Walled-in courtyard adjoins Building No. 9944-B at extreme right edge. Steam plant is in distance. This photo makes a panorama with photo WA-202-10-2. - Madigan Hospital, Detention Wards, Bounded by Wilson & McKinley Avenues & Garfield & Lincoln Streets, Tacoma, Pierce County, WA

  5. 7. WASTE CALCINING FACILITY, LOOKING AT NORTH END OF BUILDING. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. WASTE CALCINING FACILITY, LOOKING AT NORTH END OF BUILDING. CAMERA FACING SOUTH. TENT-ROOFED COVER IN RIGHT OF VIEW IS A TEMPORARY WEATHER-PROOFING SHELTER OVER THE BLOWER PIT IN CONNECTION WITH DEMOLITION PROCEDURES. SMALL BUILDING CPP-667 IN CENTER OF VIEW WAS USED FOR SUPPLEMENTARY OFFICE SPACE BY HEALTH PHYSICISTS AND OTHERS. INEEL PROOF SHEET NOT NUMBERED. - Idaho National Engineering Laboratory, Old Waste Calcining Facility, Scoville, Butte County, ID

  6. 31. VIEW OF DRILL HALL FROM NORTH END OF DRILL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    31. VIEW OF DRILL HALL FROM NORTH END OF DRILL FLOOR FACING SOUTH. SHOWS EAST AND WEST BALCONIES, VEHICLE ENTRANCE AT THE SOUTHWEST CORNER OF THE DRILL FLOOR, THE CONCESSION STAND IN THE SOUTHEAST CORNER OF THE DRILL FLOOR AND THE FOUR WINDOWS IN THE SOUTH TRUSS SPACE. NOTE CRACKS IN THE UPPER RIGHT CORNER (WEST) OF THE SOUTH WALL. - Yakima National Guard Armory, 202 South Third Street, Yakima, Yakima County, WA

  7. 3. Streetscape showing north ends of Medical Detachment Barracks on ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Streetscape showing north ends of Medical Detachment Barracks on Ramp No. 6. The 'triple-peak building' consists of Buildings Nos. 9973-B (far left), an addition (middle), and 9972-B (with covered walkway). Other buildings in distance are the north B sides of Building Nos. 9971, 9970 and 9969 (at far right). - Madigan Hospital, Medical Detachment Barracks, Bounded by Wilson & McKinley Avenues & Garfield & Lincoln Streets, Tacoma, Pierce County, WA

  8. 5. Main Control Switchboard (north end rear), view to the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. Main Control Switchboard (north end rear), view to the south, with item 14 (the Libby transmission line panel) visible in left foreground, through item 9 (the Hot Springs No. 2 transmission line panel) obliquely visible on left side of the photograph. - Washington Water Power Clark Fork River Noxon Rapids Hydroelectric Development, Powerhouse, South bank of Clark Fork River at Noxon Rapids, Noxon, Sanders County, MT

  9. 11. PUMP ROOM FLOOR OF GENE PLANT FROM NORTH END, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. PUMP ROOM FLOOR OF GENE PLANT FROM NORTH END, CENTRIFUGAL PUMPS DESIGNED BY BYRON JACKSON CO., MANUFACTURED BY PELTON WATER WHEEL CO. OF SAN FRANCISCO. POWERED BY G.E. SYNCHRONOUS MOTOR 9000 HP, 6900 VOLTS, 612 AMPS, 7320 KVA, 3 PHASE, 60 CYCLES, 400 RPM, EXCITATION AT 125 VOLTS, 540 AMPS. - Gene Pump Plant, South of Gene Wash Reservoir, 2 miles west of Whitsett Pump Plant, Parker Dam, San Bernardino County, CA

  10. 2. CONTEXT VIEW LOOKING WEST AT THE NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. CONTEXT VIEW LOOKING WEST AT THE NORTH END OF BUILDING F, CENTER, SHOWING THE CORNER OF BUILDING D AT THE FAR RIGHT, AND THE NORTHWEST CORNER OF BUILDING AT THE FAR LEFT. BUILDING E IS VISIBLE BY THE PALM TREE AT RIGHT CENTER, JUST NORTH OF BUILDING F. - U.S. Coast Guard Air Station San Francisco, Warehouse, 1020 North Access Road, San Francisco, San Francisco County, CA

  11. The electromagnetic radiation from semiconductor minerals in orebody

    NASA Astrophysics Data System (ADS)

    Ozawa, M.; Nagahama, H.; Muto, J.; Nagase, T.

    2013-12-01

    In complex ore deposits composing semiconductor minerals, electromagnetic radiation in the radio frequency (30 kHz ~ 3 MHz) is induced by propagation of elastic waves [1]. Semiconductor minerals are divided into n- or p-type. When each p-type and n-type is joined, the resulting junction (p-n junction) has the rectifying property. Many natural orebodies show this property, but it has not been evaluated qualitatively. A lot of p-n junctions exist as which connect in parallel and in series in the orebody [2]. They can be regarded as a single p-n junction at large scale. Hence elucidating the electric property of micro p-n junction is required to understand the semiconductor properties of orebody. To discuss the electromagnetic emission from semiconductor minerals in the orebody associated with tectonic process, we measure the electric property of the semiconductor pyrite. Composition and electric properties of natural semiconductor minerals are heterogeneous due to the presence of impurities and defects. Therefore, it is needed to clarify the properties at each microscopic region. In this research, we apply electroetching method and SEM analysis to acquire composition characteristics and use an indentation probe to reveal microscopic electric properties. Sample of pyrite is from Waga-Sennin mine, Akita prefecture, Japan. The area of cross section is 1.4 cm2 with thickness of 0.38 mm2. In the electrolytic etching, the surface of samples showed etching figures and zonal structures with widths of about 10 -100 μm. According to the SEM analysis, Pb inclusions were observed to be precipitated parallel to crystallographic planes. The heterogeneous change in electric properties of each area was observed to be as etching figure. Thermal probing method clarified that the regions of n-p type differences were also coincidence well to etching figure patterns. P-type regions showed a higher solubility than n-type regions. At p-n junction regions, rectifying property was observed

  12. 1. EAST SIDE/NORTH END EXTERIOR OF RUSH CREEK POWERHOUSE SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. EAST SIDE/NORTH END EXTERIOR OF RUSH CREEK POWERHOUSE SHOWING ROLLING METAL DOOR ON NORTH END, SWITCHRACKS NORTH OF POWERHOUSE AND WORKER COTTAGES IN COMPLEX. VIEW TO SOUTHWEST. - Rush Creek Hydroelectric System, Powerhouse Exciters, Rush Creek, June Lake, Mono County, CA

  13. Interaction between karst terrain and bauxites: evidence from Quaternary orebody distribution in Guangxi, SW China.

    PubMed

    Yang, Lin; Wang, Qingfei; Zhang, Qizuan; Carranza, Emmanuel John M; Liu, Huan; Liu, Xuefei; Deng, Jun

    2017-09-19

    Most bauxite in China is located upon the karst surface, yet the relation between karstification process and bauxite formation is barely known. Here we discuss how the relation affects the karst and bauxite evolution through analyzing distributions of orebody parameters from 9,007 exploration wells (434 orebodies) in western Guangxi, South China block. In high-elevation karst terrain dominated by peaks, orebodies have greater average thickness, lower Al2O3 and higher Fe2O3(T) than those in low-elevation region dominated by depressions. Principal component and multifractal analyses show that the Al2O3, Fe2O3(T) and LOI and the orebody thickness, determined by depression geometry, have more even distributions in high-elevation terrain. This explains that the interaction between the oxidized, alkaline water in karst surface and the ferrous clay minerals that released H(+) during bauxite secondary weathering was more intensive in high-elevation terrain than in low-elevation one. The interaction with self-organized nature is considered responsible for the even development of karstic depressions and bauxite orebody thicknesses in high-elevation terrain. In comparison, SiO2 distribution is more even in low-elevation terrain, where connected depressions near the phreatic zone facilitated SiO2 mobilization and even distribution.

  14. Interior detail of sliding doors at north end U.S. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior detail of sliding doors at north end - U.S. Naval Base, Pearl Harbor, United States All-Steel Hangar, Wasp Boulevard between Kingfisher Street and Ranger Loop, Pearl City, Honolulu County, HI

  15. 1. 185/189D in center, north end west facades (190D front ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. 185/189-D in center, north end west facades (190-D front left and west facade; 195-D rear right). Looking south. - D-Reactor Complex, Deaeration Plant-Refrigeration Buildings, Area 100-D, Richland, Benton County, WA

  16. Exterior detail of the north end double doors U.S. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Exterior detail of the north end double doors - U.S. Naval Base, Pearl Harbor, Paint & Oil Storage, Near intersection of Avenue E & Seventh Street, adjacent to Facility Nos. 3A & 56, Pearl City, Honolulu County, HI

  17. Interior view from the north end entry U.S. Naval ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior view from the north end entry - U.S. Naval Base, Pearl Harbor, Paint & Oil Storage, Near intersection of Avenue E & Seventh Street, adjacent to Facility Nos. 3A & 56, Pearl City, Honolulu County, HI

  18. Progress report on geologic studies of the Ranger orebodies, Northern Territory, Australia

    USGS Publications Warehouse

    Nash, J.T.; Frishman, David

    1982-01-01

    The Ranger No. 1 and No. 3 orebodies contain about 124,000 tonnes U3O8 in highly chloritized metasediments of the lower Proterozoic Cahill Formation within about 500 m of the projected sub-Kombolgie Formation unconformity. In both orebodies, oxidized and reduced uranium minerals occur chiefly in quartzose schists that have highly variable amounts of muscovite, sericite, and chlorite. The effects of several periods of alteration are pervasive in the vicinity of orebodies where biotite and garnet are altered to chlorite, and feldspars to white mica or chlorite. Oxidized uranium minerals, associated with earthy iron oxides, occur from the surface to a depth of about 60 m. Below the oxidized zone, uranium occurs chiefly as uraninite and pitchblende disseminated through thick sections of quartz-chlorite-muscovite schist and has no apparent association with graphite or sulfides. In fact, graphite is rare and sulfides are generally low in abundance (<0.5 percent). Higher ore grades occur in disrupted zones a few centimeters thick and in some quartz-chlorite vein-like zones of uncertain origin. Uranium correlates strongly with chlorite, but not all of the many ages of chlorite have associated uranium. At least five textural varieties of chlorite are present and represent at least 3 ages. Preliminary microprobe analyses suggest that Mg-Fe-Al contents are relatively uniform. Apatite commonly occurs with chlorite. Uranium is not common in carbonate rocks and seems to occur only in disrupted zones that have chlorite alteration. Chloritization and silicification are more widespread and intense in the No. 1 orebody than in the No. 3. In both orebodies, hematite occurs tens to hundreds of meters below the weathered zone, in both altered and largely unaltered rocks, with and without uranium. The structure of the orebodies is outwardly simple, particularly in No. 3; dips are less than 40? on most lithologic contacts. The No. 1 orebody is in a basin-like structure about 400 m wide

  19. 52. VIEW FROM NORTH END OF SLC3W MAST TRENCH SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    52. VIEW FROM NORTH END OF SLC-3W MAST TRENCH SHOWING NORTH FACE OF ERECT UMBILICAL MAST. LAUNCHER IN BACKGROUND. METEOROLOGICAL TOWER AND SLC-3E MST IN DISTANT BACKGROUND. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  20. MTR BUILDING INTERIOR, TRA603. CAMERA IS AT NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    MTR BUILDING INTERIOR, TRA-603. CAMERA IS AT NORTH END OF THIRD FLOOR BALCONY LOOKING SOUTHEAST. DETAIL OF REACTOR'S NORTH FACE AND ITS TEST HOLES. MOCK-UP APPARATUS IS BEYOND REACTOR. INL NEGATIVE NO. HD46-5-4. Mike Crane, Photographer, 2/2005 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

  1. The Linguistic Development and Socialization of Italian-American Children in Boston's North End.

    ERIC Educational Resources Information Center

    Biondi, Lawrence S. J.

    This study investigates and determines how the processes involved in language acculturation and socialization become interrelated in the linguistic, cultural, and social development of white, Italian-American monolingual and bilingual children of working class parents in Boston's North End. This sociolinguistic study deals particularly with the…

  2. 2. Building No. 9944B. Elevation view of north end from ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Building No. 9944-B. Elevation view of north end from roof of Building No. 9981 includes walled-in courtyard between Buildings Nos. 9944-B and 9945-B. This photo makes a panorama with photo WA-202-10-1. - Madigan Hospital, Detention Wards, Bounded by Wilson & McKinley Avenues & Garfield & Lincoln Streets, Tacoma, Pierce County, WA

  3. 51. VIEW OF NORTH END OF SLC3W UMBILICAL MAST IN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    51. VIEW OF NORTH END OF SLC-3W UMBILICAL MAST IN TRENCH WITH TRENCH DOORS OPEN. SLC-3W MST IN SERVICE POSITION OVER LAUNCHER IN BACKGROUND. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  4. 7. CONSTRUCTION CAMP WAREHOUSE/SHOP, GROUND FLOOR GARAGE, INTERIOR (north end ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. CONSTRUCTION CAMP WAREHOUSE/SHOP, GROUND FLOOR GARAGE, INTERIOR (north end of building, looking south at interior wall. Note overhead crane/hoist. - Tieton Dam, Construction Camp Warehouse-Shop, South & East side of State Highway 12, Naches, Yakima County, WA

  5. PROGRESS REPORT ON GEOLOGIC STUDIES OF THE RANGER OREBODIES, NORTHERN TERRITORY, AUSTRALIA.

    USGS Publications Warehouse

    Nash, J. Thomas; Frishman, David; ,

    1985-01-01

    The Ranger No. 1 and No. 3 orebodies contain about 124,000 tonnes U//3O//8 in highly chloritized metasediments of the lower Proterozoic Cahill Formation within about 500 m of the projected sub-Kombolgie Formation unconformity. In both orebodies, oxidized and reduced uranium minerals occur chiefly in quartzose schists that have highly variable amounts of muscovite, sericite, and chlorite. The effects of several periods of alteration are pervasive in the vicinity of orebodies where biotite and garnet are altered to chlorite, and feldspars to white mica or chlorite. Oxidized uranium minerals, associated with earthy iron oxides, occur from the surface to a depth of about 60 m. Below the oxidized zone, uranium occurs chiefly as uraninite and pitchblende disseminated through thick sections of quartz-chlorite-muscovite schist and has no apparent association with graphite or sulphides. The geologic age(s) of uranium emplacement are obscure because there are few age criteria. Reduced uranium minerals are younger than 1. 8-b. y. -old granite dykes, and some occur locally in 1. 65-b. y. -old Kombolgie Formation.

  6. Sampling and analysis of chemical element concentration distribution in rock units and orebodies

    NASA Astrophysics Data System (ADS)

    Agterberg, F. P.

    2012-01-01

    Existing sampling techniques applied within known orebodies, such as sampling along mining drifts, yield element concentration values for larger blocks of ore if they are extended into their surroundings. The resulting average concentration values have relatively small "extension variance". These techniques can be used for multifractal modeling as well as ore reserve estimation approaches. Geometric probability theory can aid in local spatial covariance modeling. It provides information about increase of variability of element concentration over short distances exceeding microscopic scale. In general, the local clustering of ore crystals results in small-scale variability known as the "nugget effect". Parameters to characterize spatial covariance estimated from ore samples subjected to chemical analysis for ore reserve estimation may not be valid at local scale because of the nugget effect. The novel method of local singularity mapping applied within orebodies provides new insights into the nature of the nugget effect. Within the Pulacayo orebody, Bolivia, local singularity for zinc is linearly related with logarithmically transformed concentration value. If there is a nugget effect, moving averages resulting from covariance models or estimated by other methods that have a smoothing effect, such as kriging, can be improved by incorporating local singularities indicating local element enrichment or depletion. Although there have been many successful applications of the multifractal binomial/p model, its application within the Pulacayo orebody results in inconsistencies, indicating some shortcomings of this relatively simple approach. Local singularity analysis and universal multifractal modeling are two promising new approaches to improve upon results obtained by commonly used geostatistical techniques and use of the binomial/p model. All methods in this paper are illustrated using a single example (118 Pulacayo zinc values), and several techniques are applied to

  7. 46. NORTH END OF MILL NO. 2, 1st FLOOR, BELOW ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    46. NORTH END OF MILL NO. 2, 1st FLOOR, BELOW PICKER AND CLOTH ROOM AREA. FUNCTION OF THIS SPACE UNKNOWN AT PRESENT. NOTE THAT EYE BEAM REPLACES ORIGINAL WALL OF 1892 PICKER HOUSE. CENTER (OR LEFT) DOOR IS ENTRY TO MILL NO. 2. RIGHT DOOR IS ENTRY TO 1892 NAPPER ROOM. - Prattville Manufacturing Company, Number One, 242 South Court Street, Prattville, Autauga County, AL

  8. MTR BUILDING INTERIOR, TRA603. CAMERA IS AT NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    MTR BUILDING INTERIOR, TRA-603. CAMERA IS AT NORTH END OF SECOND FLOOR BALCONY LOOKING TOWARDS WORK PLATFORMS ON NORTH FACE OF REACTOR. BRIDGE TO THIRD FLOOR BALCONY FROM TOP OF REACTOR IS AT UPPER RIGHT OF VIEW. CAMERA FACING EASTERLY. INL NEGATIVE NO. HD-46-4-1. Mike Crane, Photographer, 2/2005 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

  9. MTR BUILDING INTERIOR, TRA603. CAMERA IS AT NORTH END OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    MTR BUILDING INTERIOR, TRA-603. CAMERA IS AT NORTH END OF THIRD FLOOR BALCONY LOOKING SOUTHEAST AND ACROSS TOP OF REACTOR. MOCK-UP APPARATUS IS BEYOND REACTOR. BRIDGE CONNECTING BALCONY AND REACTOR TOP AT RIGHT OF VIEW. INL NEGATIVE NO. HD46-5-2. Mike Crane, Photographer, 2/2005 - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

  10. Oreshoot zoning in the Carlin-type Betze orebody, Goldstrike Mine, Eureka County, Nevada

    USGS Publications Warehouse

    Peters, Stephen G.; Ferdock, Gregory C.; Woitsekhowskaya, Maria B.; Leonardson, Robert; Rahn, Jerry

    1998-01-01

    Field and laboratory investigations of the giant Betze gold orebody, the largest Carlin-type deposit known, in the north-central Carlin trend, Nevada document that the orebody is composed of individual high-grade oreshoots that contain different geologic, mineralogic, and textural characteristics. The orebody is typical of many structurally controlled Carlin-type deposits, and is hosted in thin-bedded, impure carbonate or limy siltstone, breccia bodies, and intrusive or calc-silicate rock. Most ores in the Betze orebody are highly sheared or brecciated and show evidence of syndeformational hydrothermal deposition. The interplay between rock types and pre- and syn-structural events accounts for most of the distribution and zoning of the oreshoots. Hydrothermal alteration is scale dependent, either in broad, pervasive alteration patterns, or in areas related to various oreshoots. Alteration includes decarbonatization (~decalcification) of carbonate units, argillization (illite-clay), and silicification. Patterns of alteration zoning in and surrounding the Betze orebody define a large porous, dilated volume of rock where high fluid flow predominated. Local restriction of alteration to narrow illite- and clay-rich selvages around unaltered marble or calc-silicate rock phacoids implies that fluid flow favored permeable structures and deformed zones. Gold mainly is present as disseminated sub-micron-sized particles, commonly associated with Asñrich pyrite, although one type of oreshoot contains micron-size free gold. Oreshoots form a three-dimensional zoning pattern in the orebody within a WNW-striking structural zone of shearing and shear folding, termed the Dillon deformation zone (DDZ). Main types of oreshoots are: (1) rutile-bearing siliceous oreshoots; (2) illite-clay-pyrite oreshoots; (3) realgar- and orpiment-bearing oreshoots; (4) stibnite-bearing siliceous oreshoots; and (5) polymetallic oreshoots. Zoning patterns result from paragenetically early development

  11. The development of volcanic hosted massive sulfide and barite gold orebodies on Wetar Island, Indonesia

    NASA Astrophysics Data System (ADS)

    Scotney, Philip M.; Roberts, Stephen; Herrington, Richard J.; Boyce, Adrian J.; Burgess, Ray

    2005-07-01

    Wetar Island is composed of Neogene volcanic rocks and minor oceanic sediments and forms part of the Inner Banda Arc. The island preserves precious metal-rich volcanogenic massive sulfide and barite deposits, which produced approximately 17 metric tonnes of gold. The polymetallic massive sulfides are dominantly pyrite (locally arsenian), with minor chalcopyrite which are cut by late fractures infilled with covellite, chalcocite, tennantite tetrahedrite, enargite, bornite and Fe-poor sphalerite. Barite orebodies are developed on the flanks and locally overly the massive sulfides. These orebodies comprise friable barite and minor sulfides, cemented by a series of complex arsenates, oxides, hydroxides and sulfate, with gold present as <10 μm free grains. Linear and pipe-like structures comprising barite and iron-oxides beneath the barite deposits are interpreted as feeder structures to the barite mineralization. Hydrothermal alteration around the orebodies is zoned and dominated by illite kaolinite smectite assemblages; however, local alunite and pyrophyllite are indicative of late acidic, oxidizing hydrothermal fluids proximal to mineralization. Altered footwall volcanic rocks give an illite K Ar age of 4.7±0.16 Ma and a 40Ar/39Ar age of 4.93±0.21 Ma. Fluid inclusion data suggest that hydrothermal fluid temperatures were around 250 270°C, showed no evidence of boiling, with a mean salinity of 3.2 wt% equivalent NaCl. The δ34S composition of sulfides ranges between +3.3‰ and +11.7‰ and suggests a significant contribution of sulfur from the underlying volcanic edifice. The δ34S barite data vary between +22.4‰ and +31.0‰, close to Miocene seawater sulfate. Whole rock 87Sr/86Sr analyses of unaltered volcanic rocks (0.70748 0.71106) reflect contributions from subducted continental material in their source region. The 87Sr/86Sr barite data (0.7076 0.7088) indicate a dominant Miocene seawater component to the hydrothermal system. The mineral deposits formed on

  12. THE WEATHERING OF A SULFIDE OREBODY: SPECIATION AND FATE OF SOME POTENTIAL CONTAMINANTS

    SciTech Connect

    Courtin-Nomade, Alexandra; Grosbois, Cecile; Marcus, Matthew A.; Fakra, Sirine C.; Beny, Jean Michel; Foster, Andrea L.

    2010-07-16

    Various potentially toxic trace elements such as As, Cu, Pb and Zn have been remobilized by the weathering of a sulfide orebody that was only partially mined at Leona Heights, California. As a result, this body has both natural and anthropogenically modified weathering profiles only 500 m apart. The orebody is located in a heavily urbanized area in suburban Oakland, and directly affects water quality in at least one stream by producing acidic conditions and relatively high concentrations of dissolved elements (e.g., {approx}500 mg/L Cu, {approx}3700 mg/L Zn). Micrometric-scale mineralogical investigations were performed on the authigenic metal-bearing phases (less than 10 {mu}m in size) using electron-probe micro-analysis (EPMA), micro-Raman, micro X-ray absorption spectroscopy (mXAS), scanning X-ray diffraction (mSXRD) and scanning X-ray fluorescence (mSXRF) mapping techniques. Those measurements were coupled with classical mineralogical laboratory techniques, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Authigenic metal-bearing phases identified are mainly sulfates (jarosite, epsomite, schwertmannite), Fe (oxy-)hydroxides (goethite, hematite and poorly crystalline Fe products) and poorly crystalline Mn (hydr-)oxides. Sulfates and Fe (oxy-)hydroxides are the two main secondary products at both sites, whereas Mn (hydr-) oxides were only observed in the samples from the non-mining site. In these samples, the various trace elements show different affinities for Fe or Mn compounds. Lead is preferentially associated with Mn (hydr-)oxides and As with Fe (oxy-)hydroxides or sulfates. Copper association with Mn and Fe phases is questionable, and the results obtained rather indicate that Cu is present as individual Cu-rich grains (Cu hydroxides). Some ochreous precipitates were found at both sites and correspond to a mixture of schwertmannite, goethite and jarosite containing some potentially toxic trace elements such as Cu, Pb and Zn. According to the

  13. The weathering of a sulfide orebody: Speciation and fate of some potential contaminants

    USGS Publications Warehouse

    Courtin-Nomade, A.; Grosbois, C.; Marcus, M.A.; Fakra, S.C.; Beny, J.-M.; Foster, A.L.

    2009-01-01

    Various potentially toxic trace elements such as As, Cu, Pb and Zn have been remobilized by the weathering of a sulfide orebody that was only partially mined at Leona Heights, California. As a result, this body has both natural and anthropogeni- cally modified weathering profiles only 500 m apart. The orebody is located in a heavily urbanized area in suburban Oakland, and directly affects water quality in at least one stream by producing acidic conditions and relatively high concentrations of dissolved elements (e.g., ??500 ??g/L Cu, ??3700 ??g/L Zn). Micrometric-scale mineralogical investigations were performed on the authigenic metal-bearing phases (less than 10 ??m in size) using electron-probe micro-analysis (EPMA), micro-Raman, micro X-ray absorption spectroscopy (??XAS), scanning X-ray diffraction ((??SXRD) and scanning X-ray fluorescence (??-SXRF) mapping techniques. Those measurements were coupled with classical mineralogical laboratory techniques, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Authigenic metal-bearing phases identified are mainly sulfates (jarosite, epsomite, schwertmannite), Fe (oxy-)hydroxides (goethite, hematite and poorly crystalline Fe products) and poorly crystalline Mn (hydr-)oxides. Sulfates and Fe (oxy-)hydroxides are the two main secondary products at both sites, whereas Mn (hydr-) oxides were only observed in the samples from the non-mining site. In these samples, the various trace elements show different affinities for Fe or Mn compounds. Lead is preferentially associated with Mn (hydr-)oxides and As with Fe (oxy-)hydroxides or sulfates. Copper association with Mn and Fe phases is questionable, and the results obtained rather indicate that Cu is present as individual Cu-rich grains (Cu hydroxides). Some ochreous precipitates were found at both sites and correspond to a mixture of schwertmannite, goethite and jarosite containing some potentially toxic trace elements such as Cu, Pb and Zn. According to the trace

  14. Environmental Assessment Addressing FTFA07-1174, Repair Approach Lighting System at the North End of Runway 01/19 at Eglin AFB, Florida

    DTIC Science & Technology

    2013-05-01

    The USAF proposes to repair the approach lighting system at the north end of Runway 01/19 on Eglin AFB, Florida. Based on the age and condition of...the existing runway approach lighting structures, repairing the approach lighting system at the north end of Runway 01/19 is required to provide a safe

  15. Map showing a deep-tow geophysical study of the north end of the San Clemente Fault, California Borderland

    USGS Publications Warehouse

    Ford, George A.; Normark, William R.

    1980-01-01

    A deep-tow geophysical study of a small ridge along the north end of the San Clemente fault, informally termed Kimki Ridge by Arne Junger and J.G. Vedder (unpub. data, 1979), was conducted in April 1976 using the R/V Melville of the Scripps Institution of Oceanography. The purpose of the survey was to search for evidence of active faulting along the north-ward extension of the San Clemente fault, a major structural feature in the California Borderland (fig. 1). 

  16. Occurrence of Sn-Bearing colusite in the ore-body "T" of the Bor copper deposit, Serbia

    NASA Astrophysics Data System (ADS)

    Cvetković, Ljubomir; Pačevski, Aleksandar; Tončić, Trajče

    2013-07-01

    The ore body "T" is the newly discovered massive-pyrite type one which is located in the central part of the Bor copper mine. The main copper minerals are chalcocite-digenite, covellite and enargite. Small amounts of colusite are frequently present in the ore-body. It mostly occurs as the distinct exsolutions in digenite and, associating with enargite and covellite. Composition of the studied colusite shows enriched Sn content, giving an empirical formula from Cu24.7V1.8Fe0.2As5.1Sb0.2Sn0.8S32 to Cu26.7V2.0Fe0.3As3.0Sb0.3Sn3.5S32. This colusite represents a solid solution between colusite and nekrasovite within a range of 14-54 mol % nekrasovite. Most of the analyses show content of <50 mol % nekrasovite corresponding to the Sn-bearing colusite variety, while one analysis shows content of 54 mol % nekrasovite corresponding to the As-bearing nekrasovite.

  17. Rhenium-osmium systematics of the Mount Isa copper orebody and the Eastern Creek Volcanics, Queensland, Australia: implications for ore genesis

    NASA Astrophysics Data System (ADS)

    Gregory, Melissa J.; Schaefer, Bruce F.; Keays, Reid R.; Wilde, Andy R.

    2008-07-01

    The syn-tectonic breccia-hosted Mount Isa Cu deposit in northwest Queensland is the largest sediment-hosted Cu deposit in Australia. Whole-rock samples of chalcopyrite-rich Cu ore form an isochron with a Re-Os age of 1,372 ± 41 Ma. This age is more than 100 Ma younger than the previously accepted age of Cu ore formation, an Ar-Ar mineral age for biotite separated from the host rocks within the alteration envelope to the Cu orebody. This discrepancy cannot be unequivocally resolved due to a lack of other absolute geochronological constraints for Cu mineralisation or the deformation event associated with Cu emplacement. The 1,372 ± 41 Ma date may reflect (a) the time of Cu deposition, (b) the time of a hydrothermal event that reset the Re-Os signature of the Cu ore or (c) mixing of the Re-Os isotope systematics between the host rocks and Cu-bearing fluids. However, a range of published Ar-Ar and Rb-Sr dates for potassic alteration associated with Cu mineralisation also records an event between 1,350 and 1,400 Ma and these are consistent with the 1,372 Ma Re-Os age. The 1.8 Ga Eastern Creek Volcanics are a series of tholeiitic basalts with a primary magmatic Cu enrichment which occur adjacent to the Mount Isa Cu deposit. The whole-rock Os isotopic signature of the Eastern Creek Volcanics ranges from mantle-like values for the upper Pickwick Member, to more radiogenic/crustal values for the lower Cromwell Member. The Re-Os isotope signature of the Cu ores overlaps with those calculated for the two volcanic members at 1,372 Ma; hence, the Os isotope data are supportive of the concept that the Os in the Cu ores was sourced from the Eastern Creek Volcanics. By inference, it is therefore postulated that the Eastern Creek Volcanics are the source of Cu in the Mount Isa deposit, as both Os and Cu are readily transported by oxidised hydrothermal fluids, such as those that are thought to have formed the Cu orebody. The Pickwick Member yields a Re-Os isochron age of 1,833

  18. Deep Coral Habitat Characterization of the North End of Raita Bank, Papahānaumokuākea Marine National Monument in the Northwestern Hawaiian Islands

    NASA Astrophysics Data System (ADS)

    Foxworth, L.; Sautter, L.

    2016-02-01

    The purpose of this study is to characterize and explore the north end of Raita Bank in the Northwestern Hawaiian Islands, to assess where deep marine coral would most likely grow and flourish. The bank is located within the largest U.S marine protected area, the Papahānaumokuākea Marine National Monument (PMNM), 1120 km northwest of Honolulu, Hawaii. Multibeam sonar data were collected by the Schmidt Ocean Institute using the R/V Falkor's Kongsberg EM302 and EM710 during an exploratory cruise within the PMNM in May-June 2014. Raita Bank hosts both shallow and deep coral; however, this study was focused on potential deep coral habitat at depths ranging 400 to 3000 m. The bank stretches approximately 44.0 km east-west and 35.8 km north-south and its shallowest point surveyed is 320 m. Overall gradients between 400 and 3000 m depths range from 0.10 to 0.26, including major terraces at 500 and 1000 m. The steeper gradients and terraced areas indicate favorable conditions for deep coral. A bathymetric map created with CARIS HIPS and SIPS 9.0 software was used to visualize seafloor geomorphology and characterize deep coral habitat by examining slope relief, distance to shelf edge, and other geomorphologic features. Additionally, backscatter was used to analyze the seafloor's relative hardness to identify hard-bottom seafloor areas that would be more likely to support deep coral. Maps generated from this study will be invaluable for future explorations of deep coral habitat on the bank.

  19. D-0 North End Cap Calorimeter Cold Test Results

    SciTech Connect

    Michael, J.; /Fermilab

    1990-08-02

    The North endcap calorimeter vessel was recieved on July 1, 1990. A cooldown of the pressure vessel with liquid nitrogen was performed on July 10-11 to check the vessel's integrity. With the pressure vessel cold, the insulating vacuum was monitored for leaks. Through out the testing, the insulating vacuum remained good and the vessel passed the test. The cold test was carried out per the procedures of D-Zero engineering note 3740.220-EN-250. The test was very similar to the cold test performed on the Central Calorimeter in October of 1987. Reference D-Zero engineering notes 3740.210-EN-122, 3740.000-EN107, and 3740.210-EN-110 for information about the CC cold test. The insulating vacuum space was pumped on while equipment was being connected to the pressure vessel. Two hours after starting to pump with the blower the vacuum space pressure was at about 210 microns. Pumping on the vacuum space for the next 15 hours showed no progress and a leak detector was connected to the pumping line. A leak check showed a leak in a thermocouple feedthru on the vacuum space relief plate. After fixing the leak, the pressure dropped to 16 microns in less than one hour. A rate of rise test was performed starting at a pressure of 13 microns. The pressure rose to 39 microns within 8 minutes and then only rose to 43 microns in 2.5 hours (1.6 microns/hour). After all connections were made to the pressure vessel, a vacuum pump with an estimated effective pumping speed of about 70 scfm was valved on. The lowest pressure achieved after 2 days of pumping was 80 microns. Valving out the pump for 30 minutes resulted in a 5 micron per minute rate of rise. The rate of rise was considered acceptable since there were known leak paths through the bolts of the signal ports. The EC North vessel was rolled outside of Lab A in preparation for a 5000 gallon liquid nitrogen trailer which arrived July, 10 at 8:00am. Before filling the vessel, the vacuum space pump was valved off. The pressure in the vacuum space was 12 microns at that point. During the next 24 hours of the test, the vacuum space pressure decreased to 5 microns. A plot of the vacuum space pressure with time is included at the end of this note. The liquid nitrogen was pressure transferred from the trailer at 29 psig to the pressure vessel at 1 psig for ten hours. At that time there was sufficient (16-inch) of liquid nitrogen in the vessel to turn the LN2 trailer delivery pump on. Thirteen and one half hours after starting the fill, the vessel had 50-inch of LN2 collected. During the latter part of the filling, about twelve loud metallic bangs were heard. The noises came at random intervals with sometimes five minutes between and other times an hour between. The best way to describe the sound is to imagine the sound made if someone was trapped inside the vessel with a baseball bat and took a good swing. The trailer was disconnected and the the vessel was left overnight for ten hours. Due to the slow LN2 fill rate, the temperature gradient in the pressure vessel shell was not very large, only about 25 kelvin difference was found from a RTD in the warm-up nozzle of the vessel and the resistors of the liquid level probe. A temperature versus time graph is included at the end of this note.

  20. North End Runway Material Extraction and Transport Environmental Assessment

    DTIC Science & Technology

    2006-05-01

    Contaminants include chlorinated solvent products and hydrocarbons, primarily benzene (EAFB, 2003). Levels of chlorinated solvents at FT23 must attenuate to... etg . 0 a l.SY~3~ {\\(SYJL ..------ v~&;41r~ eobr) (a =t= I ,-·- ~~ t2-- ------ ~8~\\e.,. Hydric Soil Indicators: _& Histosol _ Concretions Histic

  1. Geology of the north end of the Salt Valley Anticline, Grand County, Utah

    USGS Publications Warehouse

    Gard, Leonard Meade

    1976-01-01

    This report describes the geology and hydrology of a portion of the Salt Valley anticline lying north of Moab, Utah, that is being studied as a potential site for underground storage of nuclear waste in salt. Selection of this area was based on recommendations made in an earlier appraisal of the potential of Paradox basin salt deposits for such use. Part of sec. 5, T. 23 S., R. 20 E. has been selected as a site for subsurface investigation as a potential repository for radioactive waste. This site has easy access to transportation, is on public land, is isolated from human habitation, is not visible from Arches National Park, and the salt body lies within about 800 feet (244 m) of the surface. Further exploration should include investigation of possible ground water in the caprock and physical exploration of the salt body to identify a thick bed of salt for use as a storage zone that can be isolated from the shaly interbeds that possibly contain quantities of hydrocarbons. Salt Valley anticline, a northwest-trending diapiric structure, consists of Mesozoic sedimentary rocks arched over a thick core of salt of the Paradox Member of the Middle Pennsylvanian Hermosa Formation. Salt began to migrate to form and/or develop this structure shortly after it was deposited, probably in response to faulting. This migration caused upwelling of the salt creating a linear positive area. This positive area, in turn, caused increased deposition of sediments in adjacent areas which further enhanced salt migration. Not until late Jurassic time had flowage of the salt slowed sufficiently to allow sediments of the Morrison and younger formations to be deposited across the salt welt. A thick cap of insoluble residue was formed on top of the salt diapir as a result of salt dissolution through time. The crest of the anticline is breached; it collapsed in two stages during the Tertiary Period. The first stage was graben collapse during the early Tertiary; the second stage occurred after Miocene regional uplift had caused downcutting streams to breach the salt core resulting in further collapse. The axis of the anticline is a narrow generally flat-floored valley containing a few hills composed of downdropped Mesozoic rocks foundered, in the caprock. The caprock, which underlies thin alluvium in the valley, is composed of contorted gypsum, shale, sandstone, and limestone--the insoluble residue of the Paradox salt.

  2. Geology of the north end of the Ruby Range, southwestern Montana

    USGS Publications Warehouse

    Tysdal, Russell G.

    1970-01-01

    This study consists of two parts: stratigraphy and sedimentation, and structure of rocks in the northern one-third of the Ruby Range of southwestern Montana. Detailed studies of Cambrian marine dolomite rocks in the Red Lion Formation and in the upper part of the Pilgrim Limestone resulted in their division into distinct rock units, termed lithofacies. These lithofacies contain features suggestive of subtidal, intertidal, and supratidal environments similar to those presently forming in the Persian Gulf. Stromatolltic structures occurring in the uppermost part of the Red Lion Formation are similar to those presently forming in Shark Bay, Australia. The Ruby Range within the map area is broken into a series of northwest-plunging basement (Precambrian metamorphic rock) blocks, differentially uplifted during the Cretaceous-Tertiary orogenic period. These blocks are bordered by upthrust faults, which are nearly vertical in their lower segments and are .low-angle in their uppermost parts. Asymmetrical folds in Paleozoic sedimentary rocks formed in response to the differential uplift of the blocks; thus they too plunge to the northwest. Displaced masses of rock border the range on the three sides within the map area and are interpreted as gravity-slide features resulting from uplift of the range. Normal faulting began blocking out the present range margins by Oligocene time.

  3. Fluid inclusion and stable isotope data for the Pea Ridge Fe-REE orebody, Missouri

    SciTech Connect

    Sidder, G.B.; Day, W.C.; Rye, R.O. )

    1993-03-01

    New fluid-inclusion and stable-isotope data define the character of the mineralizing fluids that formed the iron and rare-earth-element ore deposit at the Pea Ridge Mine, southeast Missouri. These fluids were very hot and highly saline brines that may have been magmatically derived. Early, pre-magnetite ore skarn alteration of the host rhyolitic tuff took place at temperatures greater than 420 C and possibly as high as 680 C based upon calculated temperatures of quartz-magnetite pairs. Halite homogenization of three- or more phase (liquid + vapor + salts) fluid inclusions in quartz indicates that the skarn-forming fluid had a temperature of about 460 C to > 530 C and a salinity of about 45 to 57 equivalent weight percent NaCl. Analyses of [delta][sup 18]O in quartz from the skarn zone average about 14.5[per thousand], compared to a value of about 13.0[per thousand] for quartz in the host rhyolite. Average [delta][sup 34]S values for pyrite of about 2.3[per thousand] in the skarn zone may reflect a magmatic source. Magnetite ore was deposited at temperatures between about 340 C and 530 C from a fluid with a salinity between about 54 and 60 equivalent weight percent NaCl. The large apparent range of temperatures indicated by both fluid-inclusion and stable-isotope data within each zone may be due to contamination by quartz from multiple stages of quartz deposition. Also, the assumed isotopic equilibrium between some mineral pairs may be incorrect. Moreover, fluid inclusions are relatively rare in all ore and alteration zones except the silicified zone, and only a few inclusions are clearly primary in origin. Nonetheless, the predominance of high temperatures and high salinities in all of the mineralized and altered zones supports the interpretation that Pea ridge is a magmatic hydrothermal deposit. This magmatic hydrothermal model is also supported by paragenetic relations defined by geologic mapping and geochemical modeling of major-, minor-, and trace-element data.

  4. Oreshoot Zoning in the Carlin-Type Betze Orebody, Goldstrike Mine, Eureka County, Nevada

    DTIC Science & Technology

    1998-01-01

    oreshoots. Hydrothermal alteration is scale dependent, either in broad, pervasive alteration patterns, or in areas related to various oreshoots...genesis in terms of the regional tectono- paleo-thermal history. Hydrothermal Alteration Alteration types associated with gold mineralized...compatible with synchronous deformation and hydrothermal alteration . Crystallinities of illite in altered diorite and calc-silicate rock (0.73° to 1.05° 2θ

  5. Genesis of superimposed hypogene and supergene Fe orebodies in BIF at the Madoonga deposit, Yilgarn Craton, Western Australia

    NASA Astrophysics Data System (ADS)

    Duuring, Paul; Hagemann, Steffen

    2013-03-01

    The Madoonga iron ore body hosted by banded iron formation (BIF) in the Weld Range greenstone belt of Western Australia is a blend of four genetically and compositionally distinct types of high-grade (>55 wt% Fe) iron ore that includes: (1) hypogene magnetite-talc veins, (2) hypogene specular hematite-quartz veins, (3) supergene goethite-hematite, and (4) supergene-modified, goethite-hematite-rich detrital ores. The spatial coincidence of these different ore types is a major factor controlling the overall size of the Madoonga ore body, but results in a compositionally heterogeneous ore deposit. Hypogene magnetite-talc veins that are up to 3 m thick and 50 m long formed within mylonite and shear zones located along the limbs of isoclinal, recumbent F1 folds. Relative to least-altered BIF, the magnetite-talc veins are enriched in Fe2O3(total), P2O5, MgO, Sc, Ga, Al2O3, Cl, and Zr; and depleted in SiO2 and MnO2. Mafic igneous countryrocks located within 10 m of the northern contact of the mineralised BIF display the replacement of primary igneous amphibole and plagioclase, and metamorphic chlorite by hypogene ferroan chlorite, talc, and magnetite. Later-forming, hypogene specular hematite-quartz veins and their associated alteration halos partly replace magnetite-talc veins in BIF and formed during, to shortly after, the F2-folding and tilting of the Weld Range tectono-stratigraphy. Supergene goethite-hematite ore zones that are up to 150 m wide, 400 m long, and extend to depths of 300 m replace least-altered BIF and existing hypogene alteration zones. The supergene ore zones formed as a result of the circulation of surface oxidised fluids through late NNW- to NNE-trending, subvertical brittle faults. Flat-lying, supergene goethite-hematite-altered, detrital sediments are concentrated in a paleo-topographic depression along the southern side of the main ENE-trending ridge at Madoonga. Iron ore deposits of the Weld Range greenstone belt record remarkably similar deformation histories, overprinting hypogene alteration events, and high-grade Fe ore types to other Fe ore deposits in the wider Yilgarn Craton (e.g. Koolyanobbing and Windarling deposits) despite these Fe camps being presently located more than 400 km apart and in different tectono-stratigraphic domains. Rather than the existence of a synchronous, Yilgarn-wide, Fe mineralisation event affecting BIF throughout the Yilgarn, it is more likely that these geographically isolated Fe ore districts experienced similar tectonic histories, whereby hypogene fluids were sourced from commonly available fluid reservoirs (e.g. metamorphic, magmatic, or both) and channelled along evolving structures during progressive deformation, resulting in several generations of Fe ore.

  6. Assessment of Sediment Risk in the North End of Tai Lake, China: Integrating Chemical Analysis and Chronic Toxicity Testing with Chironomus dilutus.

    PubMed

    Qi, Hongxue; Ma, Ping; Li, Huizhen; You, Jing

    2015-11-01

    Whole life-cycle bioassays with Chironomus dilutus were performed to evaluate sediment toxicity in Tai Lake, a typical freshwater lake in China. Meanwhile, contaminants of concern were analyzed in sediment. The sediments in Tai Lake showed no acute mortality in 10-day testing to C. dilutus. After chronic exposure to the sediments, however, adverse effects-including decreased survival and sublethal impairments of growth, emergence, and fecundity-were observed at most sites in Tai Lake. A variety of contaminants were detected in sediment with the total concentrations in the range of 504-889 ng/g dry weight (dw) for polycyclic aromatic hydrocarbons, 0.56-1.81 ng/g dw for polychlorinated biphenyls, 38.6-87.8 ng/g dw for polybrominated diphenyl ethers, 8.34-14.2 ng/g dw for organochlorine pesticides, 1.27-2.95 ng/g dw for organophosphate pesticides, 0.11-0.21 ng/g dw for pyrethroid pesticides, and 332-609 µg/g dw for metals. Finally, a canonical correlation analysis was applied to link chronic sediment toxicity to the toxic units of individual contaminants. Results suggested that two pesticides (hexachlorocyclohexane and chlorpyrifos) and two metals (chromium and nickel) in sediments from Tai Lake were the potential contributors to the noted toxicity in C. dilutus in the life-cycle toxicity testing. In conclusion, acute bioassays with the benthos were not sensitive enough to assess sediment toxicity in freshwater lakes in China, and it is desirable to integrate chronic toxicity testing with chemical analysis to better understand sediment risk.

  7. A reinterpretation of the δDH2O of inclusion fluids in contemporaneous quartz and sphalerite, Creede mining district, Colorodo: a generic problem for shallow orebodies?

    USGS Publications Warehouse

    Foley, Nora K.; Bethke, Philip M.; Rye, Robert O.

    1989-01-01

    The unusually high contrast between the salinities of the ore-depositing fluids and the ground water overlying the ore zone allowed recognition of this phenomenon at Creede. It is likely, however, that Creede is not unique. Similar phenomena may be common in shallow ore zones where rapid fluctuation of an interface between a deep, high-temperature thermal plume and an overlying, cooler ground water may be expected to occur. Careful study of the origins of fluid inclusions, particularly in quartz, is essential to characterize the primary ore fluids and to assess the role of ground water in the hydrology of shallow ore deposits.

  8. Orebody geometry, fluid and metal sources of the Omitiomire Cu deposit in the Ekuja Dome of the Damara Belt in Namibia

    NASA Astrophysics Data System (ADS)

    Kitt, Shawn; Kisters, Alexander; Vennemann, Torsten; Steven, Nick

    2017-04-01

    The Omitiomire Cu deposit (resource of 137 Mt at 0.54% Cu) in the Ekuja Dome of the Damara Belt in Namibia is hosted by an anastomosing, low-angle Pan-African (ca. 520 Ma) shear zone system developed around an older (ca. 1100-1060 Ma), late Mesoproterozoic intrusive breccia between a suite of mafic rocks (originally lava flows) and later tonalitic gneisses. High-grade ore shoots preferentially formed along contacts between tectonically interleaved biotite-epidote-quartz-chalcocite schists and felsic gneisses, and are directly related to an increase in the number and cumulative thickness of thin, contact-parallel mineralized shear zones. Alteration and mineralization are associated with elevated concentrations of K2O, Cr, Rb, S, and Cu and a loss of Na2O, CaO, and MgO. Oxygen isotope fractionation for quartz-biotite, quartz-feldspar, and quartz-amphibole mineral pairs support equilibrium temperatures of between 500 and 650 °C during the fluid/rock interaction. Mineral separates from amphibole-biotite gneisses and mineralized schists have similar ranges in δ18O values of about 1.2 to 2 ‰ relative to VSMOW. Coexisting minerals are arranged in an order of increasing δ18O values from biotite, to epidote, amphibole, and quartz, suggesting that the Omitiomire Shear Zone was a rock-dominated system. Similarly, H-isotope results for mineral separates from biotite-epidote schists and amphibole gneisses do not show any reversals for D/H fractionations, with δD values of between -48 and -82 ‰, typical of metamorphic-magmatic rocks. The homogeneous and low δ34S values (-6.1 to -4.7 ‰ CDT) are compatible with a local redistribution of sulfur from magmatic rocks and interaction with sulfur derived from metamorphic fluids of metasedimentary origin. The relatively low fluid/rock ratios and elevated Cu values (>1500 ppm) from unaltered amphibolite point to a local redistribution of an earlier (late Mesoproterozoic) Keweenaw-type Cu mineralization into later Pan-African shear zones during the exhumation of the Ekuja Dome. The timing, polyphase evolution, and tectonic setting of the Omitiomire deposit show remarkable similarities with the large Cu deposits of the Domes Region in the adjoining Lufilian Arc of northern Zambia. This suggests the presence of a much larger, regionally significant Cu province extending from central Namibia, through northern Botswana, and into Zambia.

  9. Magmatic Conduit Metallogenic System in Jinchuan Cu-Ni (PGE) Sulfide Deposit

    NASA Astrophysics Data System (ADS)

    Su, S.; Tang, Z.; Zhou, M.; Song, C.

    2014-12-01

    The Jinchuan Cu-Ni (PGE) sulfide deposit is located in the southwestern margin of North China Craton. Jinchuan ultramafic intrusion hosts the third largest magmatic Cu-Ni deposit in the world. There are mainly four orebodies, namely, orebody-58, orebody-24, orebody-1, and orebody-2, respectively from west to east in the deposit. The primary characteristics of Jinchuan Cu-Ni sulfide deposit are the following: (1) There is an obvious boundary between orebodys and country rocks, usually orebodys intruded into country rocks. (2) "sulfide melts" migrate and settle in the later stage of magma evolution. (3) Fluid Minerals Assemblages are found in the sulfide ores, there is Phl+Cc+Pn+Ccp+Po in orebody-2; Phl+Dol+AP+Pn+Ccp+Po in orebody-24; Q+Mag+AP+Pn+Ccp+Po in orebody-58. (4) Massive sulfides mainly occur in orebody-2, and its PGE content is very rare. Pt-Pd enrichment zones mainly occur in orebody-1; orebody-24 and orebody-58. Ir vs. Ru, Rh, Pt, Pd show positive relationship in orebody-2, but Ir vs. Ru, Rh show positive relationship, Ir vs. Pt, Pd exhibit negative relationship in orebody-1, orebody-24 and orebody-58. The modeling of Ir-Pd shows that the massive sulfide in orebody-2 maybe the origin of MSS. Pt-Pd enrichment zones in orebody-1 orebody-24 and orebody-58 are the relic liquid of monosulfide solid solution segregation; (5) Cu/Ni value is 1.24 in orebody-58, 1.56 in orebody-24, 1.83 in orebody-1, and 2.06 in orebody-2. These features imply that (1) "ore magma" or "melt-fluid bearing metal" formed in the staging chamber in depth; (2) "ore magma" might contain a lot of fluids; (3) "melt-fluid bearing metal" flow moves as a whole; (4) The moving direction of melt-fluid bearing metal flow is form west to east. The ores are enriched in Ni in the front, and enriched in Cu, Pt, Pd in the back of Jinchuan Magmatic Conduit Metallogenic System.

  10. Quantifying multi-element and volumetric uncertainty, Coleman McCreedy deposit, Ontario, Canada

    NASA Astrophysics Data System (ADS)

    Goodfellow, Ryan; Albor Consuegra, Francisco; Dimitrakopoulos, Roussos; Lloyd, Tim

    2012-05-01

    Traditional geostatistical modelling of orebodies and estimation of grade-tonnage curves do not account for the uncertainty of the orebody grades and tonnages. Geological interpretations of complex shapes are often over-constrained, and therefore do not properly identify the location of the ore. In these situations, tonnage is often under-estimated and grade is over-estimated, resulting in orebody models used for mine planning that lead to costly financial decisions. This paper presents an approach aiming to better assess the uncertainty in an orebody model. The approach is applied to Vale's West Orebody of the Coleman McCreedy Mine, a poly-metallic deposit containing nickel, copper, gold, platinum and palladium. To encapsulate the orebody's variability and uncertainty, the nickel-copper sulphide mineralized zone is simulated using the single normal equation simulation method. The realizations serve as the orebody models from which the grades of multiple elements are jointly simulated using Min/Max Autocorrelation Factors. The final result is a series of equiprobable representations of the mineralization that incorporates both grade and tonnage uncertainty. The case study indicates that had conventional orebody estimations been used, there would have been a 10% over-estimation of orebody volume, along with significant over-estimation of low-grade material and under-estimation of high-grade material.

  11. 14. VIEW TO WESTSOUTHWEST ACROSS CAR TEST TRACT SITE TO ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. VIEW TO WEST-SOUTHWEST ACROSS CAR TEST TRACT SITE TO NORTH END OF ASSEMBLY PLANT, SHOWING NORTH END ADDITIONS. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  12. Use of structural geology in exploration for and mining of sedimentary rock-hosted Au deposits

    USGS Publications Warehouse

    Peters, Stephen G.

    2001-01-01

    Structural geology is an important component in regional-, district- and orebody-scale exploration and development of sedimentary rock-hosted Au deposits.Identification of timing of important structural events in an ore district allows analysis and classification of fluid conduits and construction of genetic models for ore formation.The most practical uses of structural geology deal with measurement and definition of various elements that comprise orebodies, which can then be directly applied to ore-reserve estimation,ground control,grade control, safety issues,and mine planning.District- and regional-scale structural studies are directly applicable to long-term strategic planning,economic analysis,and land ownership. Orebodies in sedimentary rock-hosted Au deposits are discrete, hypogene, epigenetic masses usually hosted in a fault zone,breccia mass, or lithologic bed or unit. These attributes allow structural geology to be directly applied to the mining and exploration of sedimentary rock-hosted Au deposits. Internal constituents in orebodies reflect unique episodes relating to ore formation.The main internal constituents in orebodies are ore minerals, gangue, and alteration minerals that usually are mixed with one another in complex patterns, the relations among which may be used to interpret the processes of orebody formation and control.Controls of orebody location and shape usually are due to structural dilatant zones caused by changes in attitude, splays, lithologic contacts,and intersections of the host conduit or unit.In addition,conceptual parameters such as district fabric,predictable distances, and stacking also are used to understand the geometry of orebodies.Controls in ore districts and location and geometry of orebodies in ore districts can be predicted to various degrees by using a number of qualitative concepts such as internal and external orebody plunges,district plunge, district stacking, conduit classification, geochemical, geobarometric and

  13. A parasitological survey in three selected communities in Luapula Province, Northern Rhodesia

    PubMed Central

    McCullough, Fergus; Friis-Hansen, Bent

    1961-01-01

    The authors present the results of a parasitological survey conducted among children living in three rural and geographically separate communities selected for the work of the Health and Nutrition Scheme, Fort Rosebery, Northern Rhodesia. The survey included observations on Plasmodium spp. and other parasites of the blood, Endamoeba spp., and helminth and arthropod parasites. In addition, data on the distribution and taxonomy of local anophelines and fresh-water molluscs are given. As was expected, malaria, urinary bilharziasis and hookworm were the most important parasitic infections recorded, though the prevalence of each varied considerably in each community. Such local variation in prevalence of a particular parasitic infection should prove to be encouraging, rather than discouraging, to the initiation of control measures. The results of the present survey support the view, too frequently forgotten, that for an adequate understanding of the prevalence of different parasitic infections precise, local investigations are imperative; without such investigations, broad conclusions are seldom valid. PMID:13773853

  14. 81. PHOTOCOPY OF DRAWING, SURFACE BUILDINGS, GENERAL, TRANSFORMER HOUSE, LOWER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    81. PHOTOCOPY OF DRAWING, SURFACE BUILDINGS, GENERAL, TRANSFORMER HOUSE, LOWER CAMP, NORTH END - Kennecott Copper Corporation, On Copper River & Northwestern Railroad, Kennicott, Valdez-Cordova Census Area, AK

  15. 82. PHOTOCOPY OF DRAWING, SURFACE BUILDINGS, GENERAL, TRANSFORMER HOUSE, LOWER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    82. PHOTOCOPY OF DRAWING, SURFACE BUILDINGS, GENERAL, TRANSFORMER HOUSE, LOWER CAMP, NORTH END - Kennecott Copper Corporation, On Copper River & Northwestern Railroad, Kennicott, Valdez-Cordova Census Area, AK

  16. 7. CABLE RACK, MEZZANINE LEVEL, INTERIOR OF TEST STAND 1A. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. CABLE RACK, MEZZANINE LEVEL, INTERIOR OF TEST STAND 1A. Looking north from north end of the cable tunnel leading toward Control Center. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  17. 24. Aerial photograph dated 22 April 1942, showing Gould Island ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    24. Aerial photograph dated 22 April 1942, showing Gould Island from the northeast. Complex under construction includes shop building (large rectangle at north end of island, and firing pier (at far right). Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  18. 17. HOLDING TANKS AND SLUICE DOORS This picture is taken ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. HOLDING TANKS AND SLUICE DOORS This picture is taken from atop the redwood holding tanks at the north end of the building, looking across at the north end of the building. Below can be seen the sluice doors through which the fish flowed to the cutting area. - Hovden Cannery, 886 Cannery Row, Monterey, Monterey County, CA

  19. Fast 3D Focusing Inversion of Gravity Data Using Reweighted Regularized Lanczos Bidiagonalization Method

    NASA Astrophysics Data System (ADS)

    Rezaie, Mohammad; Moradzadeh, Ali; Kalate, Ali Nejati; Aghajani, Hamid

    2017-01-01

    Inversion of gravity data is one of the important steps in the interpretation of practical data. One of the most interesting geological frameworks for gravity data inversion is the detection of sharp boundaries between orebody and host rocks. The focusing inversion is able to reconstruct a sharp image of the geological target. This technique can be efficiently applied for the quantitative interpretation of gravity data. In this study, a new reweighted regularized method for the 3D focusing inversion technique based on Lanczos bidiagonalization method is developed. The inversion results of synthetic data show that the new method is faster than common reweighted regularized conjugate gradient method to produce an acceptable solution for focusing inverse problem. The new developed inversion scheme is also applied for inversion of the gravity data collected over the San Nicolas Cu-Zn orebody in Zacatecas State, Mexico. The inversion results indicate a remarkable correlation with the true structure of the orebody that is achieved from drilling data.

  20. Origin of the Mariano Lake uranium deposit, McKinley County, New Mexico

    USGS Publications Warehouse

    Fishman, Neil S.; Reynolds, Richard L.

    1982-01-01

    The Mariano Lake uranium deposit, hosted by the Brushy Basin Member of the Jurassic Morrison Formation, occurs in the trough of an east-west trending syncline at the western end of the Smith Lake-Mariano Lake group of uranium deposits near Crownpoint, New Mexico. The orebody, which contains abundant amorphous organic material, is situated on the reduced side of a regional reduction-oxidation (redox) interface. The presence of amorphous organic material suggests the orebody may represent a tabular (primary) deposit, whereas the close proximity of the orebody to the redox interface is suggestive that uranium was secondarily redistributed by oxidative processes from pre-existing tabular orebodies. Uranium contents correlate positively with both organic carbon and vanadium contents. Petrographic evidence and scanning electron microscope-energy dispersive analyses point to uranium residence in the epigentically introduced amorphous organic material, which coats detrital grains and fills voids. Uranium mineralization was preceded by the following diagenetic alterations: precipitation of pyrite (d34S values ranging from-11.0 to-38.2 per mil); precipitation of mixed-layer smectite-illite clays; partial dissolution of some of the detrital feldspar population; and precipitation of quartz and adularia overgrowths. Alterations associated with uranium mineralization include emplacement of amorphous organic material (possibly uranium bearing); destruction of detrital iron-titanium oxide grains; coprecipitation of chlorite and microcrystalline quartz, and precipitation of pyrite and marcasite (d34S values for these sulfides ranging from -29.4 to -41.6 per mil). After mineralization, calcite, dolomite, barite, and kaolinite precipitated, and authigenic iron disulfides were replaced by ferric oxides and hydroxides. Geochemical data (primarily the positive correlation of uranium content to both organic carbon and vanadium contents) and petrographic observations (epigentically

  1. Origin of the Nchanga copper-cobalt deposits of the Zambian Copperbelt

    NASA Astrophysics Data System (ADS)

    McGowan, Ross R.; Roberts, Stephen; Boyce, Adrian J.

    2006-01-01

    The Zambian Copperbelt forms the southeastern part of the 900-km-long Neoproterozoic Lufilian Arc and contains one of the world’s largest accumulations of sediment-hosted stratiform copper mineralization. The Nchanga deposit is one of the most significant ore systems in the Zambian Copperbelt and contains two major economic concentrations of copper and cobalt, hosted within the Lower Roan Group of the Katangan Supergroup. A Lower Orebody (copper only) and Upper Orebody (copper and cobalt) occur towards the top of arkosic units and within the base of overlying shales. The sulfide mineralogy includes pyrite, bornite, chalcopyrite, and chalcocite, although in the Lower Orebody, sulfide phases are partially or completely replaced by malachite and copper oxides. Carrollite is the major cobalt-bearing phase and is restricted to fault-propagation fold zones within a feldspathic arenite. Hydrothermal alteration minerals include dolomite, phlogophite, sericite, rutile, quartz, tourmaline, and chlorite. Quartz veins from the mine sequence show halite-saturated fluid inclusions, ranging from ~31 to 38 wt% equivalent NaCl, with homogenisation temperatures (ThTOT) ranging between 140 and 180°C. Diagenetic pyrites in the lower orebody show distinct, relatively low δ 34S, ranging from -1 to -17‰ whereas arenite- and shale-hosted copper and cobalt sulfides reveal distinctly different δ 34S from -1 to +12‰ for the Lower Orebody and +5 to +18‰ for the Upper Orebody. There is also a clear distinction between the δ 34S mean of +12.1±3.3‰ ( n=65) for the Upper Orebody compared with +5.2±3.6‰ ( n=23) for the Lower Orebody. The δ 13C of dolomites from units above the Upper Orebody give δ 13C values of +1.4 to +2.5‰ consistent with marine carbon. However, dolomite from the shear-zones and the alteration assemblages within the Upper Orebody show more negative δ 13C values: -2.9 to -4.0‰ and -5.6 to -8.3‰, respectively. Similarly, shear zone and Upper Orebody

  2. Historical lead isotope record of a sediment core from the Derwent River (Tasmania, Australia): a multiple source environment.

    PubMed

    Townsend, Ashley T; Seen, Andrew J

    2012-05-01

    A 105 cm sediment core from the Derwent River (Tasmania, Australia) was collected in 2004 and was characterised considering both physical (loss on ignition at 550 °C and grain size) and chemical (Fe, Cu, Zn, Cd and Pb concentrations, Pb isotope ratios and (210)Pb dating) properties. The core was analysed to (i) investigate the historical profiles of some important elements associated with the Risdon zinc refinery adjacent to the Derwent River, (ii) determine Pb isotopic signatures of sediment samples, and (iii) assess the veracity of Pb isotope ratios as indicators of contaminant Pb input. Extractable metal concentrations were (all values as mgkg(-1), non-normalised for grain size) Fe: 20,000-35,000, Zn: 42-4500, Pb: 5-1090, Cu: 13-141, and Cd: 1-31; with a close correlation between Cu, Zn, Cd and Pb. Metal enrichment factors (normalised to Al) were Pb: 0.9-144, Zn: 0.8-93, Cd: 0.8-30, Cu: 0.8-8.9 and Fe: 0.9-1.3, confirming anthropogenic contributions of Cu, Zn, Pb and Cd to the sediments. The onset of metal contamination above background levels occurred at a depth between 43 and 49 cm, with maximum concentrations noted near 20 cm for Cu, Zn, Cd and Pb. Lead isotope ratios were determined in sediments using sector field ICP-MS, and were found to be 36.5-38.8, 16.5-18.7 and 1.07-1.20 for (208)Pb/(204)Pb, (206)Pb/(204)Pb and (206)Pb/(207)Pb ratios, respectively. Major Australian ores processed at the refinery over the previous ~90 years include those from Broken Hill, Rosebery, Mt Isa, Elura, Hellyer and Century deposits. Anthropogenic impact by Pb with Broken Hill type isotopic ratio was initially evident in the core at 43-49 cm. The introduction of Rosebery and Elura ores to the refinery was also clearly noted. Pb isotope ratios further highlight that the Derwent River has been exposed to a greater impact by anthropogenic Pb in comparison to other major Tasmanian rivers, namely the Huon and Tamar.

  3. U-Pb isotope systematics and apparent ages of uranium ores, Ambrosia Lake and Smith Lake districts, Grants mineral belt, New Mexico.

    USGS Publications Warehouse

    Ludwig, K. R.; Simmons, K.R.; Webster, J.D.

    1984-01-01

    Two types of uranium orebodies occur in continental sandstones of the Upper Jurassic Morrison formation: 1) 'primary' tabular peneconcordant bodies rich in interstitial organic material (containing most of the U) and older than the overlying Cretaceous Dakota sandstone and 2) younger discordant ore-bodies associated with Tertiary faults, containing little organic material (coffinite is the U-carrier) and considered to be redistributed primary ore. U/Pb isotope ages of four of the younger ore-bodies from the Ambrosia Lake district are concordant at 3.3-12.5 m.y. U/Pb isotope ages of primary ores from the same district show pronounced normal discordance, explained by continuous loss of Pb and 238U daughters and, locally, by U-gain during Tertiary redistribution. The primary ores, without Tertiary U-gain, plot on the concordia diagram close to a calculated continuous diffusion curve for coupled loss of Pb and 238U daughters. The concordia intercept of this curve corresponds with an age of approx 130 m.y. Ore-bodies in the Smith Lake district have characteristics both of primary (co-extensive with organic material) and redistributed (discordant) types. They show less coherent U/Pb isotope systematics but give only pre-Tertiary apparent ages.-G.J.N.

  4. Gravity measurements useful in the preliminary evaluation of the Nimiuktuk barite deposit, Alaska.

    USGS Publications Warehouse

    Barnes, D.F.; Mayfield, C.F.; Morin, R.L.; Brynn, S.

    1982-01-01

    Measurements taken in 1979 are used to assess the Nimiuktuk deposit; combined models suggest that the orebody contains a total mass of >1.5M metric tons of high-grade barite. The anomaly associated with Nimiuktuk suggests that gravity exploration could locate other massive deposits.-after Authors

  5. The Balmat-Edwards zinc-lead deposits-synsedimentary ore from Mississippi valley-type fluids.

    USGS Publications Warehouse

    Whelan, J.F.; Rye, R.O.; Delorraine, W.

    1984-01-01

    The Balmat-Edwards Zn-Pb district in New York is in Mid-Proterozoic Grenville marbles. Tabular to podiform, generally conformable massive sphalerite-galena orebodies occur at various horizons in the approx 1 km-thick marbles. Metamorphism obscured or obliterated most primary characteristics, whose reconstruction is attempted through detailed S, C, and O isotope studies of the Fowler orebody, and trace element and S isotope studies of sphalerite concentrates and composite ore samples from 22 orebodies. Sulphur isotope data reflect equilibration at near peak metamorphism with some indication of re-equilibration during retrograde metamorphism. The carbon and oxygen isotope composition of gangue carbonates suggests derivation from the host marbles. The oxygen isotope composition of gangue quartz is compatible with a chert origin or metamorphism-equilibration with other minerals. Sulphur and lead isotopes and sulphide mineralogy suggests that the ore fluids were evolved basin brines, chemically like those responsible for Mississippi Valley-type deposits. The large stratigraphic span (> 600 m) of the Balmat orebodies may be due to basin dewatering of million-year intervals. Stratigraphically increasing 34S values of evaporite-anhydrite are postulated to record hydrothermal events and to imply bacterial sulphate reduction on an unusually large scale. Such a stratigraphic increase may be a general exploration guide where sediment-hosted exhalative deposits or Mississippi Valley-type deposits occur.-G.J.N.

  6. Preliminary mineralogic, fluid inclusion, and stable isotope study of the Mahd adh Dhahab gold mine, Kingdom of Saudi Arabia

    USGS Publications Warehouse

    Rye, Robert O.; Hall, W.E.; Cunningham, C.G.; Czamanske, G.K.; Afifi, A.M.; Stacey, J.S.

    1983-01-01

    The Mahd adh Dhahab mine, located about 280 km northeast of Jiddah, Kingdom of Saudi Arabia, has yielded more than 2 million ounces of gold from periodic production during the past 3,000 years. A new orebody on the southern side of the ancient workings, known as the South orebody, is being developed by Gold Fields-Mahd adh Dhahab Limited. A suite of samples was collected from the newly exposed orebody for preliminary mineralogic, stable isotope, fluid inclusion, and geochemical studies. The Mahd adh Dhahab deposit is in the carapace of a Proterozoic epizonal rhyolite stock that domed pyroclastic and metasedimentary rocks of the Proterozoic Halaban group. Ore of gold, silver, copper, zinc, tellurium, and lead is associated with north-trending, steeply dipping quartz veins in a zone 1,000 m long and 400 m wide. The veins include an assemblage of quartz-chlorite-pyrite-hematite-chalcopyrite-sphalerite-precious metals, which is similar to the mineral assemblage at the epithermal deposit at Creede, Colorado. The primary ore contains abundant chalcopyrite, sphalerite, and pyrite in addition to a complex precious metal assemblage. Gold and silver occur principally as minute grains of telluride minerals disseminated in quartz-chlorite-hematite and as inclusions in chalcopyrite and sphalerite. Telluride minerals include petzite, hessite, and sylvanite. Free gold is present but not abundant. All of the vein-quartz samples contained abundant, minute inclusions of both low-density, vapor-rich fluids and liquid-rich fluids. Primary fluid inclusions yielded homogenization temperatures of from 110? to 238? C. Preliminary light-stable isotope studies of the sulfide minerals and quartz showed that all of the d34S values are between 1.2 and 6.3 per mil, which is a typical range for hydrothermal sulfide minerals that derive their sulfur from an igneous source. The data-suggest that the sulfide sulfur isotope geochemistry was controlled by exchange with la large sulfur isotope

  7. Geochemical characteristics of the Church Rock 1 and 1 East uranium deposits, Grants uranium region, New Mexico

    USGS Publications Warehouse

    Fishman, Neil S.; Reynolds, Richard L.

    1983-01-01

    In the Church Rock 1 and 1 East mines, Grants uranium region (GUR), New Mexico, uranium orebodies occur within three sandstone units in the upper part of the Westwater Canyon Member of the late Jurassic Morrison Formation. Geochemical analyses reveal that organic carbon contents in ore samples from all three sand units are uniformly low (most are less than 0.01 percent). Vanadium (ranging from 0.0002 to 0.19 percent) and sulfur (ranging from <0.01 to 0.74 percent) typically show positive correlations with uranium; however, vanadium contents rarely exceed those of uranium in ore samples. Although no systematic relationship of either selenium or molybdenum to uranium is evident, some ore samples contain anomalously high concentrations of either of these elements. Geochemically, the ore deposits of the Church Rock area contrast greatly with primary (tabular) uranium orebodies in the GUR which contain abundant organic carbon and greater amounts of vanadium and sulfur. These differences and radiometric age determinations strongly suggest that the Church Rock ores formed as a result of the redistribution of uranium from preexisting uranium deposits within the last 1 m.y. However, the Church Rock deposits differ geochemically from redistributed orebodies in the Westwater Canyon Member elsewhere in the GUR. Specifically, redistributed orebodies in the Ambrosia Lake district, which are comparable in contents of uranium and organic carbon with the Church Rock deposits, are characterized by vanadium contents typically higher than those of uranium. Similarly, sulfur contents in the redistributed deposits of the Ambrosia Lake district are greater than those found in the Church Rock ores. In addition, anomalously high concentrations of molybdenum have rarely been found in other redistributed orebodies of the GUR.

  8. 11. Submersible torpedo tube mounted on platform of elevator at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. Submersible torpedo tube mounted on platform of elevator at northeast (starboard) elevator tower. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  9. 44. 'Submarine Torpedo Tube Foundation and Towers,' Y&D Drawing 226855, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    44. 'Submarine Torpedo Tube Foundation and Towers,' Y&D Drawing 226855, approved by Bureau of Ordnance. Dated 20 October 1943. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  10. 3. VIEW, LOOKING EAST, SHOWING OPEN SPACE AT RANGE BUILDING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW, LOOKING EAST, SHOWING OPEN SPACE AT RANGE BUILDING AT NORTH END, Interior - Winchester Repeating Arms Company, Tract K Shooting Range, 125 Munson Street (rear section), New Haven, New Haven County, CT

  11. DETAIL, CONTROL BOOTH, RP1 TANK FARM Edwards Air Force ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL, CONTROL BOOTH, RP1 TANK FARM - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Combined Fuel Storage Tank Farm, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  12. 5. EAST SIDE, TEST STAND AND ITS SUPERSTRUCTURE. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. EAST SIDE, TEST STAND AND ITS SUPERSTRUCTURE. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  13. 2. BUILDING 8767, SOUTH FRONT AND EAST SIDE. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. BUILDING 8767, SOUTH FRONT AND EAST SIDE. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  14. 16. DETAIL SHOWING LIQUID OXYGEN TANK FOURTEENINCH BALL VALVE. Looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. DETAIL SHOWING LIQUID OXYGEN TANK FOURTEEN-INCH BALL VALVE. Looking southwest. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  15. DELUGE AND WATER RECLAMATION BASIN BELOW TEST STAND 1A. Looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DELUGE AND WATER RECLAMATION BASIN BELOW TEST STAND 1-A. Looking north northwest - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Flame Deflector Water System, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  16. 4. DETAIL SHOWING FLAME DEFLECTOR. Looking southeast. Edwards Air ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. DETAIL SHOWING FLAME DEFLECTOR. Looking southeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  17. 17. DETAIL, FOURTEENINCH LIQUID OXYGEN BALL VALVE. Looking south southeast. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. DETAIL, FOURTEEN-INCH LIQUID OXYGEN BALL VALVE. Looking south southeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  18. 7. MOTION PICTURE CAMERA STAND AT BUILDING 8768. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. MOTION PICTURE CAMERA STAND AT BUILDING 8768. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  19. 8. BUILDING 8769, WEST FRONT AND SOUTH SIDE. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. BUILDING 8769, WEST FRONT AND SOUTH SIDE. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  20. 4. BUILDING 8767, INTERIOR. Looking west. Edwards Air Force ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. BUILDING 8767, INTERIOR. Looking west. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  1. 6. BUILDING 8768, NORTHWEST SIDE AND SOUTHWEST FRONT. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. BUILDING 8768, NORTHWEST SIDE AND SOUTHWEST FRONT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  2. 11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF SUPERSTRUCTURE. Looking northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  3. 22. DETAIL, TWO LIGHTING TYPES AT REAR OF TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. DETAIL, TWO LIGHTING TYPES AT REAR OF TEST STAND 1-A. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  4. 8. SOUTH REAR, SUPERSTRUCTURE. Looking north from deck. Edwards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. SOUTH REAR, SUPERSTRUCTURE. Looking north from deck. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  5. 14. DETAIL SHOWING HYDROGEN (LEFT) AND OXYGEN (RIGHT) PREVALVES. Looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. DETAIL SHOWING HYDROGEN (LEFT) AND OXYGEN (RIGHT) PREVALVES. Looking southeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  6. 77 FR 19689 - Notice of Inventory Completion: California Department of Parks and Recreation, Sacramento, CA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-02

    ... and all of the Chocolate Mountains, the territory extends southward to Todos Santos Bay, Laguna Salada... a line from just below Borrego Springs to the north end of the Salton Basin and the Chocolate...

  7. 3. VIEW OF EAST SOUTHEAST, GROUND LEVEL VIEW OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW OF EAST - SOUTHEAST, GROUND LEVEL VIEW OF APPROACH SPANS, NORTH END OF BRIDGE, MAIN SPANS IN BACKGROUND - Buffalo River Bridge, Spanning Buffalo River on U.S. Highway 65, Marshall, Searcy County, AR

  8. Partial elevation view of the Oregon Trunk Railway Freight Depot, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Partial elevation view of the Oregon Trunk Railway Freight Depot, view looking west at north end of east façade - Oregon Trunk Railway Freight Depot, Southwest First Street & Cascade Avenue, Redmond, Deschutes County, OR

  9. 22. DETAIL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING FISH LADDER AT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. DETAIL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING FISH LADDER AT NORTH END OF DAM/SPILLWAY; VIEW SHOWS SECTION OF FISH LADDER NEAR WHERE IT ENTERS THE COLUMBIA RIVER. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  10. 24. DETAIL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER AT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    24. DETAIL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER AT NORTH END OF DAM/SPILLWAY; WATER FLOWING THROUGH FISH LADDER IS VISIBLE AT BOTTOM. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  11. Facility No. 171, oblique view of west side and north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Facility No. 171, oblique view of west side and north end, with Facility Nos. 170 and S169 in the background - U.S. Naval Base, Pearl Harbor, Inert Ammunition Storehouses, Avocet and Kingfisher Streets, Pearl City, Honolulu County, HI

  12. 25. Detail of cast iron lamp post base with fluted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Detail of cast iron lamp post base with fluted wooded post at top, located at north end of bridge. VIEW NORTHEAST - Chelsea Street Bridge & Draw Tender's House, Spanning Chelsea River, Boston, Suffolk County, MA

  13. 13. Historic American Buildings Survey Alex Bush, Photographer, January 8, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. Historic American Buildings Survey Alex Bush, Photographer, January 8, 1937 STAIR ON NORTH END OF PORTICO - Wilcox County Courthouse, Broad, Claiborne, Court & Water Streets, Camden, Wilcox County, AL

  14. ARC-1943-A93-0074-5

    NASA Image and Video Library

    1943-05-19

    Navy Naval Air Station Moffett Field Public works Serial 1514 - Contract NOy-5604, Earl W. Heple & J.H. Pomeroy contractors NAS Moffett Field: Aerial view of new Hangar2 & Hangar 3 construction at alt 200 ft from north end.

  15. GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL AERIAL VIEW TO SOUTH OF ELWHA DAM AND POWERHOUSE WITH NORTH END OF RESERVOIR. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

  16. 4. Upper level of marine museum looking southwest at enclosed ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Upper level of marine museum looking southwest at enclosed exterior wall of area office building - Duluth Ship Canal, Marine Museum-Area Office, North end of Minnesota Point at Canal Park, Duluth, St. Louis County, MN

  17. 7. North side of marine museum and area office building ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. North side of marine museum and area office building looking south-southwest - Duluth Ship Canal, Marine Museum-Area Office, North end of Minnesota Point at Canal Park, Duluth, St. Louis County, MN

  18. 3. Eastlooking view of marine museum lower and upper floors ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. East-looking view of marine museum lower and upper floors from area office building window - Duluth Ship Canal, Marine Museum-Area Office, North end of Minnesota Point at Canal Park, Duluth, St. Louis County, MN

  19. 1. GENERAL PERSPECTIVE VIEW OF TOWN OF ATLANTIC CITY, LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. GENERAL PERSPECTIVE VIEW OF TOWN OF ATLANTIC CITY, LOOKING NORTH FROM NINTH FLOOR OF CEASAR'S PARKING GARAGE ON KENTUCKY AVENUE - Town of Atlantic City, North end of Absecon Island, South of Absecon Channel, Atlantic City, Atlantic County, NJ

  20. 30. Bronze plaque located on southern inner wall at east ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    30. Bronze plaque located on southern inner wall at east end of south pier taken looking southeast - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  1. 1. PAINT AND OIL STORAGE SHED, FRONT, LOOKING SOUTHWEST. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. PAINT AND OIL STORAGE SHED, FRONT, LOOKING SOUTHWEST. - NIKE Missile Base SL-40, Paint & Oil Storage Shed, North end of base, northwest of Mess Hall & south of Basketball Court, Hecker, Monroe County, IL

  2. 2. PAINT AND OIL STORAGE SHED, FRONT AND RIGHT SIDES, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. PAINT AND OIL STORAGE SHED, FRONT AND RIGHT SIDES, LOOKING SOUTH. - NIKE Missile Base SL-40, Paint & Oil Storage Shed, North end of base, northwest of Mess Hall & south of Basketball Court, Hecker, Monroe County, IL

  3. 7. PHOTOCOPY, ELEVATIONS FOR E.M. BARRACKS, N.C.O. AND OFFICERS QUARTERS. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. PHOTOCOPY, ELEVATIONS FOR E.M. BARRACKS, N.C.O. AND OFFICERS QUARTERS. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  4. 2. BARRACKS, NEXT TO BASKETBALL COURT, RIGHT SIDE, LOOKING SOUTHEAST. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. BARRACKS, NEXT TO BASKETBALL COURT, RIGHT SIDE, LOOKING SOUTHEAST. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  5. 3. BARRACKS, NEXT TO BASKETBALL COURT, LEFT SIDE, LOOKING NORTHWEST. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. BARRACKS, NEXT TO BASKETBALL COURT, LEFT SIDE, LOOKING NORTHWEST. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  6. 5. BARRACKS, NEXT TO BASKETBALL COURT, RIGHT AND REAR SIDES, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. BARRACKS, NEXT TO BASKETBALL COURT, RIGHT AND REAR SIDES, LOOKING EAST. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  7. 4. BARRACKS, NEXT TO BASKETBALL COURT, FRONT AND LEFT SIDE, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. BARRACKS, NEXT TO BASKETBALL COURT, FRONT AND LEFT SIDE, LOOKING NORTHWEST. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  8. 1. BARRACKS, NEXT TO BASKETBALL COURT, FRONT, LOOKING SOUTHWEST. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. BARRACKS, NEXT TO BASKETBALL COURT, FRONT, LOOKING SOUTHWEST. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  9. 12. View to north along recovery dock along east side ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. View to north along recovery dock along east side of firing pier. Steel brackets originally supported a sheltering canopy over the dock. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  10. Looking southeast from intersection of Idaho Avenue and Line Street ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Looking southeast from intersection of Idaho Avenue and Line Street showing north end and west front - University of Idaho, University Classroom Building, Line Street between University Avenue & Idaho Avenue, Moscow, Latah County, ID

  11. Perspective view toward southwest from Idaho Avenue showing east side ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Perspective view toward southwest from Idaho Avenue showing east side and north end - University of Idaho, University Classroom Building, Line Street between University Avenue & Idaho Avenue, Moscow, Latah County, ID

  12. Looking southwest from Idaho Avenue showing east side and north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Looking southwest from Idaho Avenue showing east side and north end with entrance - University of Idaho, University Classroom Building, Line Street between University Avenue & Idaho Avenue, Moscow, Latah County, ID

  13. 10. VIEW OF BUILDING 6. INTERIOR OF SINGLE STORY SECTION ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. VIEW OF BUILDING 6. INTERIOR OF SINGLE STORY SECTION AT NORTH END. FACING SOUTHEAST. - Winehaven, Storage Cellar & Fermentation Room, Point Molate Naval Fuel Depot, Richmond, Contra Costa County, CA

  14. 3. Historic American Buildings Survey, Frederik C. Gjessing, Photographer April ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic American Buildings Survey, Frederik C. Gjessing, Photographer April 19, 1954 WALL FRAGMENTS AT NORTH END OF SECOND LINE OF DEFENSE, NORTH ELEVATION. - Fortifications of San Juan, Outer Defenses, Puerta de Tierra, San Juan, San Juan Municipio, PR

  15. 4. Historic American Buildings Survey, Frederik C. Gjessing, Photographer April ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic American Buildings Survey, Frederik C. Gjessing, Photographer April 19, 1954 WALL FRAGMENT AT NORTH END OF SECOND LINE OF DEFENSE, EAST ELEVATION. - Fortifications of San Juan, Outer Defenses, Puerta de Tierra, San Juan, San Juan Municipio, PR

  16. Bruce D. Judd, FAIA, Photographer August 1997. OBLIQUE VIEW OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Bruce D. Judd, FAIA, Photographer August 1997. OBLIQUE VIEW OF LOS ANGELES CITY HALL SHOWING NORTH END OF EAST ELEVATION, FACING NORTHWEST. - Los Angeles City Hall, 200 North Spring Street, Los Angeles, Los Angeles County, CA

  17. 7. FIRST FLOOR, INTERIOR, DETAIL OF FISH SMOKING OVEN LOCATED ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. FIRST FLOOR, INTERIOR, DETAIL OF FISH SMOKING OVEN LOCATED IN NORTH END OF BUILDING, ALONG WEST WALL; LOOKING WEST - Gerber Sheet Metal Works Building, 128 Porthand Avenue, South, Minneapolis, Hennepin County, MN

  18. 8. Historic American Buildings Survey PHOTOCOPY CA. 1916 OF SLEEPING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Historic American Buildings Survey PHOTOCOPY CA. 1916 OF SLEEPING PORCH, AT NORTH END CAPABLE OF SLEEPING SIX. Original in Collections of Marian College - James A. Allison Mansion, 3200 Coldspring Road, Indianapolis, Marion County, IN

  19. 17. Interior first level view looking north within forward (north) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. Interior first level view looking north within forward (north) section of firing pier. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  20. 18. Interior first level view looking northnortheast within forward (north) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. Interior first level view looking north-northeast within forward (north) section of firing pier, with office module toward foreground. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  1. 4. VIEW OF WATER TOWER FROM ELECTRICAL TRANSFORMER CAGE AT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF WATER TOWER FROM ELECTRICAL TRANSFORMER CAGE AT NORTH END OF SECOND FLOOR WAREHOUSE. VIEW TO WEST-NORTHWEST. - Ford Motor Company Long Beach Assembly Plant, Assembly Building, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  2. 6. ROOF OF TURBINE BUILDING AND OF L.P. BOILER ROOM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. ROOF OF TURBINE BUILDING AND OF L.P. BOILER ROOM FROM NORTH END OF TURBINE BUILDING ROOF - Portland General Electric Company, Turbine Building, 1841 Southeast Water Street, Portland, Multnomah County, OR

  3. 6. Historic American Buildings Survey Photocopy c. 1923 from J. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Historic American Buildings Survey Photocopy c. 1923 from J. J. Glessner The Story of a House FIRST FLOOR STAIRCASE: MAIN HALL NORTH END - John J. Glessner House, 1800 South Prairie Avenue, Chicago, Cook County, IL

  4. 33 CFR 117.1058 - Snake River.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... OPERATION REGULATIONS Specific Requirements Washington § 117.1058 Snake River. (a) The draw of the... the north end, upstream side, of the Washington State highway bridge at mile 2.2. These lights shall...

  5. 33 CFR 117.1058 - Snake River.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... OPERATION REGULATIONS Specific Requirements Washington § 117.1058 Snake River. (a) The draw of the... the north end, upstream side, of the Washington State highway bridge at mile 2.2. These lights shall...

  6. 3. VIEW, LOOKING SOUTHEAST, SHOWING WEST LONGITUDINAL ELEVATION OF NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. VIEW, LOOKING SOUTHEAST, SHOWING WEST LONGITUDINAL ELEVATION OF NORTH END SPAN - East Bloomsburg Bridge, Spanning Susquehanna River at Pennsylvania Route 487 (Legislative Route 283), Bloomsburg, Columbia County, PA

  7. VIEW OF THE FRONT SIDE OF BOAT LANDING S370 NEAR ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW OF THE FRONT SIDE OF BOAT LANDING S370 NEAR NORTH END, FACING WEST - U.S. Naval Base, Pearl Harbor, Boat Landing S370, Along Essex Street at Southeast shore of Ford Island, Pearl City, Honolulu County, HI

  8. VIEW OF THE BOILER ROOM WITH STACK TO THE LEFT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW OF THE BOILER ROOM WITH STACK TO THE LEFT AND NORTH END OF THE BAGASSE STORE HOUSE TO THE RIGHT. VIEW FROM THE WEST - Kekaha Sugar Company, Sugar Mill Building, 8315 Kekaha Road, Kekaha, Kauai County, HI

  9. 18. VIEW NORTHEAST, SHAFT, CAM, AND OPERATING ARM FOR NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. VIEW NORTHEAST, SHAFT, CAM, AND OPERATING ARM FOR NORTH END LOCK, INBOARD SIDE OF WEST BASCULE GIRDER - Grand Street Bridge, Spanning Pequonnock River at Grand Street, Bridgeport, Fairfield County, CT

  10. Interior detail of exit door on second floor at north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior detail of exit door on second floor at north end; camera facing north. - Mare Island Naval Shipyard, WAVES Officers Quarters, Cedar Avenue, west side between Tisdale Avenue & Eighth Street, Vallejo, Solano County, CA

  11. 14. Historic American Buildings Survey, John O. Brostrup, Photographer January ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. Historic American Buildings Survey, John O. Brostrup, Photographer January 13, 1937 1:45 P.M. COPY OF TEXT, NORTH END OF EAST WALL IN CHAPEL OF SAAL. - The Cloisters, Saal, Ephrata, Lancaster County, PA

  12. 10. Historic American Buildings Survey, John O. Brostrup, Photographer January ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. Historic American Buildings Survey, John O. Brostrup, Photographer January 13, 1937 11:35 A.M. COPY OF TEXT, NORTH END OF WEST WALL IN CHAPEL OF SAAL. - The Cloisters, Saal, Ephrata, Lancaster County, PA

  13. 6. DOUBLE METAL DOORS ON WEST SIDE WITH CABLES ENTERING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. DOUBLE METAL DOORS ON WEST SIDE WITH CABLES ENTERING GROUND AT NORTH END OF BUILDING. - Chollas Heights Naval Radio Transmitting Facility, Helix House, 6410 Zero Road, San Diego, San Diego County, CA

  14. 14. VIEW OF AREA TO BE INUNDATED FOR EASTSIDE RESERVOIR, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. VIEW OF AREA TO BE INUNDATED FOR EASTSIDE RESERVOIR, LOOKING SOUTHEAST FROM OBSERVATORY HILL AT NORTH END OF WEST DAM. - Eastside Reservoir, Diamond & Domenigoni Valleys, southwest of Hemet, Hemet, Riverside County, CA

  15. 39. West tile gauge on south pier. Each square tile ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    39. West tile gauge on south pier. Each square tile is 4' in size. Bottom left hand corner of west tile - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  16. 40. West tile gauge on south pier. Each square tile ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    40. West tile gauge on south pier. Each square tile is 4' in size. Bottom right hand corner of west tile - Duluth Ship Canal, South Pier, North end of Minnesota Point & Canal Park, Duluth, St. Louis County, MN

  17. NY32649 ELECTRICAL SUBSTATION (BUILDING 2675) AND EDUCATION CENTER (BUILDING 2670) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    NY-326-49 ELECTRICAL SUBSTATION (BUILDING 2675) AND EDUCATION CENTER (BUILDING 2670) AT NORTH END OF ARIZONA AVENUE. VIEW TO NORTHEAST. - Plattsburgh Air Force Base, U.S. Route 9, Plattsburgh, Clinton County, NY

  18. 3. Historic American Buildings Survey Lanny Miyamoto, Photographer October 1958 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. Historic American Buildings Survey Lanny Miyamoto, Photographer October 1958 INTERIOR, BREAKFAST ROOM, NORTH END - Garrett-Jacobs House, 7, 9, 11, 13 West Mount Vernon Place, Baltimore, Independent City, MD

  19. 33 CFR 165.515 - Safety Zone: Cape Fear River, Wilmington, North Carolina.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... the Battleship USS NORTH CAROLINA, across the Cape Fear River to the north end of the Coast Guard... (Chandler's Wharf), back across the Cape Fear River to Eagle Island, and then up along the west bank of the...

  20. 4. Historic American Buildings Survey Harold Allen, Photographer June 1964 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic American Buildings Survey Harold Allen, Photographer June 1964 SECOND AND THIRD FLOOR WINDOWS, NORTH END OF WEST (FRONT) ELEVATION - Jewelers' Building, 15-19 South Wabash Avenue, Chicago, Cook County, IL

  1. 27. Aerial photograph dated 14 October 1943 taken directly over ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. Aerial photograph dated 14 October 1943 taken directly over Gould Island. Completed complex shown at north end of the island (to right in photograph), including power plant, shop, frame approach, firing pier, and small harbor formed by finger pier off east side of firing pier. Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  2. Spatial and temporal zoning of hydrothermal alteration and mineralization in the Sossego iron oxide-copper-gold deposit, Carajás Mineral Province, Brazil: Paragenesis and stable isotope constraints

    USGS Publications Warehouse

    Monteiro, Lena V.S.; Xavier, R.P.; Carvalho, E.R.; Hitzman, M.W.; Johnson, C.A.; Souza, Filho C.R.; Torresi, I.

    2008-01-01

    The Sossego iron oxide–copper–gold deposit (245 Mt @ 1.1% Cu, 0.28 g/t Au) in the Carajás Mineral Province of Brazil consists of two major groups of orebodies (Pista–Sequeirinho–Baiano and Sossego–Curral) with distinct alteration assemblages that are separated from each other by a major high angle fault. The deposit is located along a regional WNW–ESE-striking shear zone that defines the contact between metavolcano–sedimentary units of the ∼2.76 Ga Itacaiúnas Supergroup and tonalitic to trondhjemitic gneisses and migmatites of the ∼2.8 Ga Xingu Complex. The deposit is hosted by granite, granophyric granite, gabbro, and felsic metavolcanic rocks. The Pista–Sequeirinho–Baiano orebodies have undergone regional sodic (albite–hematite) alteration and later sodic–calcic (actinolite-rich) alteration associated with the formation of massive magnetite–(apatite) bodies. Both these alteration assemblages display ductile to ductile–brittle fabrics. They are cut by spatially restricted zones of potassic (biotite and potassium feldspar) alteration that grades outward to chlorite-rich assemblages. The Sossego–Curral orebodies contain weakly developed early albitic alteration and very poorly developed subsequent calcic–sodic alteration. These orebodies contain well-developed potassic alteration assemblages that were formed during brittle deformation that resulted in the formation of breccia bodies. Breccia matrix commonly displays coarse mineral infill suggestive of growth into open space. Sulfides in both groups of deposits were precipitated first with potassic alteration and more importantly with a later assemblage of calcite–quartz–epidote–chlorite. In the Sequeirinho orebodies, sulfides range from undeformed to deformed; sulfides in the Sossego–Curral orebodies are undeformed. Very late, weakly mineralized hydrolytic alteration is present in the Sossego/Currral orebodies. The sulfide assemblage is dominated by chalcopyrite with

  3. Tension vein arrays in progressive strain: complex but predictable architecture, and major hosts of ore deposits

    NASA Astrophysics Data System (ADS)

    Laing, W. P.

    2004-06-01

    Most en échelon vein arrays are extensional and can be termed tension vein arrays (TVAs). TVAs in major fault and shear zones (FSZs) are subject to progressive deformation. This deforms the initial TVA (whose geometry is well documented in the literature), via discrete stages; first into progressively more complex architecture, involving folding of the tension veins, then into progressively more simple architecture, ultimately forming pipes. During this progression the TVA axis (new definition) rotates within the shear plane from normal, to parallel, to the displacement vector. The deforming TVA axis has simpler geometry than the complex tension veins, and it can be employed to precisely track the deformation state of the FSZ, its displacement vector, and shear sense, through all the strain stages. Five structural-metasomatic stages are defined by discrete steps in the strain evolution. TVAs are difficult to recognise, and are under-recognised, in ore systems for a number of inherent geological reasons. Orebodies founded on dilation form parallel to the TVA axis, which is also parallel to dilational jogs in the parent FSZ. Orebodies formed early in the FSZ history are normal to the displacement vector, and in progressive shear rotate with the TVA axis toward the displacement vector; orebodies formed late in the FSZ history overprint apparently complex to 'chaotic' vein stockwork, which nevertheless has analysable geometry. TVA-hosted orebodies are not necessarily parallel to the displacement vector of the host FSZ, but occupy elongate orientations over a 90° range within the FSZ. Large orebodies are favourably developed in TVAs in unfoliated FSZs (type 1 shear zones), which may form fluid 'superhighways'. Type 1 shear zones form in predictable circumstances involving particularly host rocktype and crustal position. Strike-slip FSZs possess a downdip TVA axis and are especially able to tap deep crustal fluid. TVA-hosted orebodies form a major deposit style

  4. Modeling the response of the geothermal system at Lihir Island, Papua New Guinea to mine dewatering

    SciTech Connect

    Menzies, A.J.; Forth, J.L.

    1995-03-01

    Lihir Gold, Ltd., with RTZ Corporation, Niugini Mining Ltd. and the Government of Papua New Guinea as major shareholders, plans to mine two contiguous gold orebodies located in the Luise Caldera, Lihir Island, Papua New Guinea. Niugini Mining Ltd. first discovered the deposit, which is believed to be the largest undeveloped gold deposit in the world, in 1982 and detailed exploration was later conducted by Kennecott Corporation (an RTZ subsidiary) who also prepared the plan for mining the deposit. The gold was deposited in the caldera breccias by rising hot fluids from a still active geothermal system to form the orebody which is to be mined in a 2 km x 1.5 km open pit that will ultimately reach a depth of about 220 m below sea level.

  5. The exhumed ``Carlin-type'' fossil oil reservoir at Yankee Basin

    NASA Astrophysics Data System (ADS)

    Hulen, Jeffrey B.; Collister, James W.; Stout, Bill; Curtiss, David K.; Dahdah, Nicolas F.

    1998-12-01

    The Carlin-type disseminated gold orebodies of Yankee basin in the southern part of the Alligator Ridge mining district in Nevada contain widespread oil as smears, open-space fillings, and fluid inclusions in syn- and pre-mineral calcite veins. These unusual oils are the relicts of an exhumed and deeply oxidized oil reservoir that encom-passes the orebodies at the crest of a dissected, anticlinal trap. Results of fluid-inclusion microthermometry and organic geochemistry demonstrate that the oils experienced peak paleotemperatures of no more than about 150°C, a temperature unusually low for Carlin-type mineralization, but ideal for the transport, entrapment, and preservation of liquid hydrocarbon. Similar geothermal systems are actively circulating at three of Nevada’s producing oil fields—Grant Canyon, Bacon Flat, and Blackburn. Accordingly, concealed Carlin-type fossil hydrothermal systems of this type, even if subeconomic for gold, could contain commercial concentrations of oil.

  6. Post-depositional tectonic modification of VMS deposits in Iberia and its economic significance

    NASA Astrophysics Data System (ADS)

    Castroviejo, Ricardo; Quesada, Cecilio; Soler, Miguel

    2011-07-01

    The original stratigraphic relationships and structure of VMS deposits are commonly obscured by deformation. This can also affect their economic significance, as shown by several Iberian Pyrite Belt (IPB, SW Iberia) examples. The contrasting rheologic properties of the different lithologies present in an orebody (massive sulphide, feeder stockwork, alteration envelope, volcanic and sedimentary rocks) play a major role in determining its overall behaviour. Variscan thin-skinned tectonics led to stacking of the massive pyrite and stockwork bodies in duplex structures, resulting in local thickening and increased tonnage of minable mineralization. Furthermore, differential mechanical behaviour of the different sulphide minerals localised the detachments along relatively ductile sulphide-rich bands. The result was a geochemical and mineralogical reorganisation of most deposits, which now consist of barren, massive pyrite horses, bounded by base metal-rich ductile shear zones. Metal redistribution was enhanced by mobilisation of the base metal sulphides from the initially impoverished massive pyrite, through pressure-solution processes, to tensional fissures within the already ductile shear zones. In NW Iberia, VMS deposits were also strongly overprinted by the Variscan deformation during emplacement of the Cabo Ortegal and Órdenes allochthonous nappe complexes, but no stacking of the orebodies was produced. Original contacts were transposed, and the orebodies, their feeder zones and the country rock acquired pronounced laminar geometry. In lower-grade rocks (greenschist facies, Cabo Ortegal Complex), solution transfer mechanisms are common in pyrite, which remains in the brittle domain, while chalcopyrite shows ductile behaviour. In higher-grade rocks (amphibolite facies, Órdenes Complex), metamorphic recrystallisation overprints earlier deformation textures. The contrasting behaviour of the IPB and NW Iberian deposits is explained by key factors that affect their

  7. The importance of mineralogical input into geometallurgy programs

    USGS Publications Warehouse

    Hoal, K. Olson; Woodhead, J.D.; Smith, Kathleen S.

    2013-01-01

    Mineralogy is the link between ore formation and ore extraction. It is the most fundamental component of geomet programs, and the most important aspect of a life-of-project approach to mineral resource projects. Understanding orebodies is achieved by understanding the mineralogy and texture of the materials, throughout the process, because minerals hold the information required to unlock the value they contain. Geomet mineralogy programs absolutely require the appropriate expertise and at least three steps of mineral characterisation prior to using semi-automated or other methods: field examination, thorough core logging, and optical microscopy. Economic geological inputs for orebody characterisation are necessary for orebody understanding, and are exemplified by current research in the Zambian Copperbelt, where revised sequence stratigraphy and understanding of alteration, metasomatism and metamorphism can be used to predict topical issues at mine sites. Environmental inputs for sustainability characterisation are demonstrated by recent work on tailings from the Leadville, Colorado, USA area, including linking mineralogy to water quality issues. Risk assessments need to take into account the technical uncertainties around geological variability and mineral extractability, and mineralogy is the only metric that can be used to make this risk contribution.

  8. Strategies for Creating Prescribed Hydraulic Fractures in Cave Mining

    NASA Astrophysics Data System (ADS)

    He, Q.; Suorineni, F. T.; Oh, J.

    2017-04-01

    The cave mining method was traditionally applied to massive low-grade, weak orebodies at shallow depths (less than 500 m) that favour cave propagation under gravity. Currently, this method is being applied to stronger orebodies and is taking place at depths of up to 2000 m below the surface. To ensure continuous cave propagation, preconditioning of the orebody is essential in this latter caving environment to improve rock mass caveability and to decrease fragmentation sizes. Hydraulic fracturing was initiated in the oil industry and is now being used in the cave mining industry as a preconditioning method and for stalled caves reactivation. A limitation of conventional hydraulic fracturing in the cave mining industry is that the hydraulic fracture orientation is uncontrollable and is dictated by the minimum in situ stress orientation. The preconditioning effectiveness of orientation-uncontrollable hydraulic fractures is limited in some geotechnical conditions, and the concept of creating orientation-controllable hydraulic fractures, here termed prescribed hydraulic fractures, is proposed to fill this gap. In this paper, the feasibility of the proposed approaches to creating prescribed hydraulic fractures is presented based on previous studies and numerical modelling. The numerical modelling code reliability in simulating the hydraulic fracture propagation and reorientation process was validated by comparing with laboratory results in the reported literature. In addition, the sensitivity of the prescribed hydraulic fracturing to the in situ stress condition and rock mass properties is examined.

  9. Geology of the Brick Flat massive sulfide body, Iron Mountain cluster, West Shasta district, California ( USA).

    USGS Publications Warehouse

    Albers, J.P.

    1985-01-01

    The Brick Flat massive sulfide body is one of a group of 8 individual bodies that constitute the Iron Mountain cluster in the S part of the West Shasta district. Before they were separated by postmineral faulting, 5 of the 8 sulfide bodies formed a single large deposit about 1375 m long with a mass of some 23 million metric tons. The pyritic Brick Flat sulfide body is one of the 5 faulted segements of this deposit. The Brick Flat massive sulfide lies within medium phenocryst rhyolite that is characteristic of the ore-bearing middle unit of the Balaklala Rhyolite. It is interpreted to be downfaulted a vertical distance of 75 to 85 m from the Old Mine sulfide-gossan orebody along the N-dipping Camden South fault. It is bounded in turn on its N side by another parallel fault, the Camden North, which drops the orebody down another 75 m to the level of the Richmond orebody. -from Author

  10. Ore mineralogy and sulfur isotope study of the massive sulfide deposit of Filon Norte, Tharsis Mine, Spain

    NASA Astrophysics Data System (ADS)

    Kase, K.; Yamamoto, M.; Nakamura, T.; Mitsuno, C.

    1990-10-01

    The volcanogenic massive sulfide deposit of Filon Norte at Tharsis is hosted by carbonaceous black slate and connected only partly with stockwork veins. The massive ores are usually composed of fine-grained pyrite with subordinate amounts of sphalerite, chalcopyrite, galena and arsenopyrite. Monoclinic pyrrhotite sometimes occurs in massive pyritic ores in the apparently middle and upper horizons of the orebody, and siderite-rich ores are interstratified with compact pyritic ores in the apparently lower horizons. From the occurrence of monoclinic pyrrhotite, together with the FeS contents of sphalerite mostly ranging from 11 to 16 mol %, it is inferred that the sulfide minerals of the massive orebody were precipitated in euxinic muds on the sea-floor at temperatures below 250°C. The negatively shifted, highly variable δ 34S values of the massive ores and their close similarity to those of the underlying black slates strongly suggest that the sulfide sulfur of the massive orebody and the slates is cognate and biogenic.

  11. Near-surface ambient noise tomography in the Baogutu copper deposit area

    NASA Astrophysics Data System (ADS)

    Li, Xin-xin; Li, Qing-chun

    2016-12-01

    The Baogutu copper deposit region is located in the northwestern margin of the Junggar basin, controlled by the NE-SW trend Darbut fault. This region developed mid-late Hercynian (330-320 Ma) intermediate-acid small porphyry bodies. Hosted in the lower carboniferous volcano-sedimentary sequences, the Baogutu porphyry copper deposit has experienced two epochs of fluid metallogenesis after the adakitic magma diagenesis. In the copper deposit area, the orebody distributes in the strata of the Baogutu and Xibeikulasi group, and the ground surface is covered by tuffaceous siltstone. The clear structure of the copper deposit has not been revealed yet. In this paper, we utilize the technique of ambient noise tomography (ANT) to image the phase velocity anomaly maps of different frequencies in the deposit area. Then, we invert the shear (S-) wave velocity structures by using a damped least squares inversion algorithm. The pattern of the tomographic images indicates that the copper deposit mainly distributes in the range of 0.3-0.5 km depth. The major orebody is identified as an obviously high-velocity anomaly. In addition, a small high-velocity anomaly is observed at a depth greater than 0.4 km in the northeast of the study area, and it might associate with another orebody of the Baogutu copper deposit, which has not previously been reported.

  12. The Talgan massive sulfide deposit, the southern Urals, Russia, as an example of subseafloor ore deposition from magmatic fluid

    NASA Astrophysics Data System (ADS)

    Amplieva, E. E.

    2008-10-01

    The sequence of orebody formation at the Talgan massive sulfide deposit; morphology of sulfide orebodies; mineralogy, texture, and structure of ore; chemical composition of minerals; and fluid inclusions and relationships between stable isotopes (S, C, O) in sulfides from ores and carbonate rocks are discussed. The deposit is localized in the Uzel’ga ore field of the northern Magnitogorsk Megazone. The sulfide ore is hosted in the upper felsic sequence of the Middle Devonian Karamalytash Formation, composed of basalt, basaltic andesite, and rhyodacite. Orebodies are irregular lenses lying conformably with host rocks. Pyrite, chalcopyrite, sphalerite, and fahlore are the major ore minerals; galena, bornite, and hematite are of subordinate abundance. Sulfide mineralization bears attributes of deposition under subseafloor conditions. The carbonate and rhyolite interlayers at the roofs of orebodies and the supraore limestone sequence served as screens. Zoning typical of massive sulfide deposits was not established. The study of fluid inclusions has shown that the temperature of the hydrothermal solution varied from 375 to 110°C. δ34S‰ ranges from -2.4 to +3.2‰ in pyrite, from -1.2 to +2.8‰ in chalcopyrite, and from -3.5 to +3.0‰ in sphalerite (CDT). These parameters correspond to an isotopic composition of magmatic sulfur without a notable percentage of sulfate sulfur. δ13C and δ18O of carbonates vary from -18.1 to +5.9‰ (PDB) and from +13.7 to +27.8‰ (SMOW), respectively. The carbon and oxygen isotopic compositions of carbonates from ores and host rocks markedly deviate from the field of marine carbonates; a deep source of carbon is suggested. The results obtained show that the main mass of polysulfide ore at the Talgan deposit was formed beneath the floor of a paleoocean. The ore-forming system was short-lived and its functioning did not give rise to the formation of zonal orebodies. Magmatic fluid played the leading role in mineral formation.

  13. Full Scale Wind Tunnel and Seaplane Tow Channel

    NASA Technical Reports Server (NTRS)

    1930-01-01

    Construction progress, Full Scale entrance cone looking north, exit cone looking south, wind vanes north end, wind vanes north end of east return passage, wind vanes south end of west exit cone looking north east, wind vanes at south end of east exit cone looking north west, entrance cone looking south from north end. Full-Scale Tunnel (FST) entrance cone under construction. Smith DeFrance describes the entrance cone in NACA TR 459 as follows: 'The entrance cone is 75 feet in length and in this distance the cross section changes from a rectangle 72 by 110 feet to a 30 by 60 foot elliptic section. The area reduction in the entrance cone is slightly less than 5:1. The shape of the entrance cone was chosen to give as fas as possible a constant acceleration to the air stream and to retain a 9-foot length of nozzle for directing the flow.' (p. 293)

  14. The geology of the Morro Velho gold deposit in the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero, Brazil

    USGS Publications Warehouse

    Vial, Diogenes Scipioni; DeWitt, Ed; Lobato, Lydia Maria; Thorman, Charles H.

    2007-01-01

    The Morro Velho gold deposit, Quadrilátero Ferrífero region, Minas Gerais, Brazil, is hosted by rocks at the base of the Archean Rio das Velhas greenstone belt. The deposit occurs within a thick carbonaceous phyllite package, containing intercalations of felsic and intermediate volcaniclastic rocks and dolomites. Considering the temporal and spatial association of the deposit with the Rio das Velhas orogeny, and location in close proximity to a major NNW-trending fault zone, it can be classified as an orogenic gold deposit. Hydrothermal activity was characterized by intense enrichment in alteration zones of carbonates, sulfides, chlorite, white mica±biotite, albite and quartz, as described in other Archean lode-type gold ores. Two types of ore occur in the deposit: dark gray quartz veins and sulfide-rich gold orebodies. The sulfide-rich orebodies range from disseminated concentrations of sulfide minerals to massive sulfide bodies. The sulfide assemblage comprises (by volume), on average, 74% pyrrhotite, 17% arsenopyrite, 8% pyrite and 1% chalcopyrite. The orebodies have a long axis parallel to the local stretching lineation, with continuity down the plunge of fold axis for at least 4.8 km. The group of rocks hosting the Morro Velho gold mineralization is locally referred to as lapa seca. These were isoclinally folded and metamorphosed prior to gold mineralization. The lapa seca and the orebodies it hosts are distributed in five main tight folds related to F1 (the best examples are the X, Main and South orebodies, in level 25), which are disrupted by NE- to E-striking shear zones. Textural features indicate that the sulfide mineralization postdated regional peak metamorphism, and that the massive sulfide ore has subsequently been neither metamorphosed nor deformed. Lead isotope ratios indicate a model age of 2.82 ± 0.05 Ga for both sulfide and gold mineralization. The lapa seca are interpreted as the results of a pre-gold alteration process and may be

  15. Rapid Sediment Characterization Tools

    DTIC Science & Technology

    2008-09-01

    the shoreline on the northeast side of South Basin. An area of higher surface concentrations (>250 μg/kg) was apparent near the mouth of Yosemite ...concentrations >2,000 μg/kg was more extensive, both at the north end of South Basin and at the mouth of Yosemite Creek. Overall, concentrations are...extent at the north end of South Basin, and increased in extent at the mouth of Yosemite Creek (Figure 4, top). At 2.5 ft below the mudline, PCB

  16. 16. Detail view of the scale area at the north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. Detail view of the scale area at the north end of the 1937 main section, looking east-northeast; the original office is at th left, and the scale at the right - Ewing Livestock Market, South side of First Avenue North, 500 feet west of Route 724, Ewing, Lee County, VA

  17. 33 CFR 165.804 - Snake Island, Texas City, Texas; mooring and fleeting of vessels-safety zone.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Snake Island, Texas City, Texas... Guard District § 165.804 Snake Island, Texas City, Texas; mooring and fleeting of vessels—safety zone... Turning Basin west of Snake Island; (3) The area of Texas City Channel from the north end of the Turning...

  18. ONE MILLION GALLON WATER TANK, PUMP HEADER PIPE (AT LEFT), ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    ONE MILLION GALLON WATER TANK, PUMP HEADER PIPE (AT LEFT), HEADER BYPASS PIPE (AT RIGHT), AND PUMPHOUSE FOUNDATIONS. Looking northeast - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Flame Deflector Water System, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  19. 9. WEST SIDE, TEST STAND AND SUPERSTRUCTURE. TEST STAND 1B ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. WEST SIDE, TEST STAND AND SUPERSTRUCTURE. TEST STAND 1-B IN DISTANCE. Looking east. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  20. GENERAL VIEW OF PUMPHOUSE FOUNDATIONS, ALSO SHOWING THREE PUMPS STILL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL VIEW OF PUMPHOUSE FOUNDATIONS, ALSO SHOWING THREE PUMPS STILL ON THE PAD, AND THE ELECTRICAL SUBSTATION IN LEFT MIDDLE DISTANCE - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Flame Deflector Water System, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  1. RP1 (KEROSENE) STORAGE TANKS ON HILLSIDE EAST OF TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    RP1 (KEROSENE) STORAGE TANKS ON HILLSIDE EAST OF TEST STAND 1-B. THIS TANK FARM SERVES BOTH TEST STANDS 1-A AND 1-B - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Combined Fuel Storage Tank Farm, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  2. 11. OBSERVATION POST NO. 3, NORTH SIDE AND WEST REAR, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. OBSERVATION POST NO. 3, NORTH SIDE AND WEST REAR, TEST STAND AT RIGHT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  3. 13. DETAIL SHOWING OXYGEN (LEFT) AND HYDROGEN (RIGHT) PREVALVES ON ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. DETAIL SHOWING OXYGEN (LEFT) AND HYDROGEN (RIGHT) PREVALVES ON SECOND DECK OF SUPERSTRUCTURE, ABOVE THE ENGINE. Looking northwest. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  4. 3. DETAIL OF NORTH FRONT AND WEST SIDE, WITH SUPERSTRUCTURE, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. DETAIL OF NORTH FRONT AND WEST SIDE, WITH SUPERSTRUCTURE, FROM NEAR OBSERVATION POST NO. 3. Looking south southeast from below. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  5. 2. TERMINAL ROOM, SHOP LEVEL INTERIOR, SHOWING MEZZANINE LEVEL CABLE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. TERMINAL ROOM, SHOP LEVEL INTERIOR, SHOWING MEZZANINE LEVEL CABLE RACK AT UPPER RIGHT. Looking north. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  6. 15. DETAIL SHOWING HYDROGEN (LEFT) AND OXYGEN (RIGHT) SPHERICAL TANKS ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. DETAIL SHOWING HYDROGEN (LEFT) AND OXYGEN (RIGHT) SPHERICAL TANKS ON RUN LINE DECK, THIRD LEVEL. DARK TONED PIPING IS THE FIRE EXTINGUISHING SYSTEM. Looking south southwest. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  7. PUMP SETS NO. 5 AND NO. 4. Each pump set ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    PUMP SETS NO. 5 AND NO. 4. Each pump set consists of a Worthington Pump and a General Electric motor - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Flame Deflector Water System, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  8. 5. METAL SHOP ROOM (AREA 108 ON PLAN CA236R36). Looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. METAL SHOP ROOM (AREA 108 ON PLAN CA-236-R-36). Looking northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  9. 1. TERMINAL ROOM, INTERIOR, SHOP LEVEL, SHOWING FIRE EXTINGUISHING SYSTEM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. TERMINAL ROOM, INTERIOR, SHOP LEVEL, SHOWING FIRE EXTINGUISHING SYSTEM PIPES AND VALVES AT LEFT. Looking southeast from entrance to terminal room. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  10. 21. VALVES, GAUGES, AND SEVERAL TYPES OF LIGHTING ALONG ROAD ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. VALVES, GAUGES, AND SEVERAL TYPES OF LIGHTING ALONG ROAD AT SOUTH REAR OF TEST STAND 1-A. RP1 TANK FARM IN MIDDLE DISTANCE. Looking northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  11. 18. CROWS NEST ATOP SUPERSTRUCTURE. Looking up from northeast corner ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. CROWS NEST ATOP SUPERSTRUCTURE. Looking up from northeast corner of run line deck. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  12. 9. BUILDING 8769, EAST REAR AND NORTH SIDE, TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. BUILDING 8769, EAST REAR AND NORTH SIDE, TEST STAND AT RIGHT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  13. 19. TRAVELING CRANE ATOP SUPERSTRUCTURE, FROM RUN LINE DECK. Looking ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. TRAVELING CRANE ATOP SUPERSTRUCTURE, FROM RUN LINE DECK. Looking up to north northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  14. 2. NORTH FRONT, FROM SUPERSTRUCTURE TO FLAME DEFLECTOR. Looking south ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. NORTH FRONT, FROM SUPERSTRUCTURE TO FLAME DEFLECTOR. Looking south southwest from Observation Post No. 1 (Building 8767). - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  15. 3. SHOP AREA. Looking west into storage cage from near ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. SHOP AREA. Looking west into storage cage from near northeast corner of room. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  16. 24. SATURN V Fl ENGINE TEST FIRING ON TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    24. SATURN V F-l ENGINE TEST FIRING ON TEST STAND 1A. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  17. 12. DETAIL SHOWING EAST SIDE OF THE OXYGEN AND HYDROGEN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. DETAIL SHOWING EAST SIDE OF THE OXYGEN AND HYDROGEN PRE-VALVE DECK (2ND LEVEL). Looking south. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  18. 5. BUILDING 8768, SOUTH SIDE AND EAST REAR. TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. BUILDING 8768, SOUTH SIDE AND EAST REAR. TEST STAND 1A AT LEFT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  19. 7. SOUTH REAR. Looking northwest from corner of the Instrumentation ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. SOUTH REAR. Looking northwest from corner of the Instrumentation and Control Building (Building 8762). - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  20. 10. DETAIL SHOWING THRUST MEASURING SYSTEM. Looking up from the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. DETAIL SHOWING THRUST MEASURING SYSTEM. Looking up from the test stand deck to east. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  1. 10. OBSERVATION POST NO. 3, WEST OF TEST STAND 1A. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. OBSERVATION POST NO. 3, WEST OF TEST STAND 1-A. SOUTH SIDE AND EAST FRONT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  2. 20. DECOMMISIONED HYDROGEN TANK IN FORMER LIQUID OXYGEN STORAGE AREA, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. DECOMMISIONED HYDROGEN TANK IN FORMER LIQUID OXYGEN STORAGE AREA, BETWEEN TEST STAND 1-A AND INSTRUMENTATION AND CONTROL BUILDING. Looking northwest. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  3. 6. CABLE RACK, MEZZANINE LEVEL, INTERIOR OF TEST STAND 1A. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. CABLE RACK, MEZZANINE LEVEL, INTERIOR OF TEST STAND 1A. Looking south from north wall of terminal room. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  4. 3. BUILDING 8767, NORTH REAR AND WEST SIDE, TEST STAND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. BUILDING 8767, NORTH REAR AND WEST SIDE, TEST STAND 1-A AT FAR RIGHT. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  5. 33 CFR 110.155 - Port of New York.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... southwest end of Hart Island; northwest of a line ranging from the water tank at the north end of Davids...) All coordinates referenced use datum: NAD 83. (6) Anchorage No. 19-A. An area located west of Hyde... the Texas Company wharf, and of a line ranging from the southeast corner of Gross Wharf to...

  6. 33 CFR 110.155 - Port of New York.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... southwest end of Hart Island; northwest of a line ranging from the water tank at the north end of Davids...) All coordinates referenced use datum: NAD 83. (6) Anchorage No. 19-A. An area located west of Hyde... the Texas Company wharf, and of a line ranging from the southeast corner of Gross Wharf to...

  7. The auditorium is visible in the center distance, beyond the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    The auditorium is visible in the center distance, beyond the north end of the administration building, in the shadow at left, and beyond the west end of the life sciences building at the right. - San Bernardino Valley College, 701 South Mount Vernon Avenue, San Bernardino, San Bernardino County, CA

  8. Courtyard between the library, at left, and the life sciences ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Courtyard between the library, at left, and the life sciences building, at right. The north end of the administration building is just out of view to the right. - San Bernardino Valley College, 701 South Mount Vernon Avenue, San Bernardino, San Bernardino County, CA

  9. 80. DETAIL OF TYPICAL PRESSURE GAUGE IN NITROGEN AND HELIUM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    80. DETAIL OF TYPICAL PRESSURE GAUGE IN NITROGEN AND HELIUM STORAGE AND TRANSFER CONTROL SKIDS ON NORTH END OF SLC-3W FUEL APRON - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  10. 14. DETAIL EXTERIOR VIEW LOOKING EAST AT DOWNSTREAM SIDE OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. DETAIL EXTERIOR VIEW LOOKING EAST AT DOWNSTREAM SIDE OF NORTH END OF DAM/SPILLWAY; GANTRY CRANE ABOVE MOVABLE STONEY GATE IS VISIBLE IN CENTER BACKGROUND; FISH LADDER ON WASHINGTON SHORE IS VISIBLE IN FOREGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  11. 30. 'Gould Island Facilities, General Plan,' submitted 29 December 1941 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    30. 'Gould Island Facilities, General Plan,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3859-46, Y&D Drawing 190833. Scales 1' = 50' and 1' = 10'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  12. Airfield setting of Facility Nos. 175 and 176, taken from ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Airfield setting of Facility Nos. 175 and 176, taken from north end of Ford Island Runway, with landplane hangars on the right - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

  13. Detail, east porch, view to southsouthwest. This was originally an ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Detail, east porch, view to south-southwest. This was originally an open porch (note chamfered porch post in center, enclosed at unknown date. Note also 6/6 windows, which appear only here and in north end of second floor. - Drew-Sherwood Farm, House, 7927 Elk Grove Boulevard, Elk Grove, Sacramento County, CA

  14. FACILITY 72, INTERIOR. 15LIGHT DOUBLE DOORS WITH 15LIGHT SIDELIGHTS AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    FACILITY 72, INTERIOR. 15-LIGHT DOUBLE DOORS WITH 15-LIGHT SIDELIGHTS AND 2-LIGHT TRANSOM. LIVING ROOM BEYOND. VIEW FACING NORTH-NORTHEAST. - U.S. Naval Base, Pearl Harbor, Naval Housing Area Makalapa, Senior Officers' Quarters Type C, North end of Makalapa Drive, Pearl City, Honolulu County, HI

  15. 14. INTERIOR OF BEDROOM NUMBER TWO SHOWING FLOOR TO CEILING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. INTERIOR OF BEDROOM NUMBER TWO SHOWING FLOOR TO CEILING BUILT-IN CLOSET OCCUPING ENTIRE NORTH END OF ROOM, AND 6-LIGHT OVER 1-LIGHT SASH WINDOW ON EAST WALL. VIEW TO NORTH. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  16. 45. 'Replace Starboard Elevator and Repairs, Gould Island, Building No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    45. 'Replace Starboard Elevator and Repairs, Gould Island, Building No. 35,' approved 26 July 1981, NUSC Drawing No. 80-67, NAV. FAC. Drawing No. 2,047,203. Scales as noted. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  17. 11. Interior view of first floor of 1922 north section, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. Interior view of first floor of 1922 north section, showing east wall and windows at far north end of building. Camera pointed E. Rear of building is partially visible on far left. - Puget Sound Naval Shipyard, Pattern Shop, Farragut Avenue, Bremerton, Kitsap County, WA

  18. Interior, equipment room, weather support area (from July, 1968 drawing) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior, equipment room, weather support area (from July, 1968 drawing) at north end of display area, looking west. Window looks south towards the main console - March Air Force Base, Strategic Air Command, Combat Operations Center, 5220 Riverside Drive, Moreno Valley, Riverside County, CA

  19. GENERAL CLOSEUP AERIAL OF ELWHA DAM AND POWER HOUSE LOOKING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    GENERAL CLOSE-UP AERIAL OF ELWHA DAM AND POWER- HOUSE LOOKING DOWN ON SURGE TANK, BIFURCATED PENSTOCK, SPILLWAYS, AND NORTH END OF RESERVOIR. PHOTO BY JET LOWE, HAER, 1995. - Elwha River Hydroelectric System, Elwha Hydroelectric Dam & Plant, Port Angeles, Clallam County, WA

  20. 78 FR 43189 - Birch Power Company; Notice of Application Tendered for Filing With the Commission and Soliciting...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-19

    ... should note the Commission's policy that agencies that cooperate in the preparation of the environmental... . You must include your name and contact information at the end of your comments. For assistance, please... 900-foot-long intake channel; (2) a powerhouse adjacent to the north end of the existing...

  1. 22. STEAM PLANT TURBINE DECK FROM SOUTH END OF BUILDING, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. STEAM PLANT TURBINE DECK FROM SOUTH END OF BUILDING, SHOWING TOPS OF DIESEL ENGINES AT FAR NORTH END, PRIOR TO INSTALLATION OF STEAM UNIT NO. 4. Ca. 1948 - Crosscut Steam Plant, North side Salt River near Mill Avenue & Washington Street, Tempe, Maricopa County, AZ

  2. 23. (Credit JTL) View looking ENE at west end of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. (Credit JTL) View looking ENE at west end of station. End addition houses chlorination equipment; to extreme right is north end of filter building built in 1942. - McNeil Street Pumping Station, McNeil Street & Cross Bayou, Shreveport, Caddo Parish, LA

  3. 21. Interior, Turbo Blower Building. Furnaceblowing engines included one Elliot ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. Interior, Turbo Blower Building. Furnace-blowing engines included one Elliot and two Brown-Boveri steam-drive turbines (shown here). The north end of the building house the plant's machine shop. - Central Furnaces, 2650 Broadway, east bank of Cuyahoga River, Cleveland, Cuyahoga County, OH

  4. 77 FR 514 - Notice of Availability of the Record of Decision for the North Steens 230 Kilovolt Transmission...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-05

    ..., Echanis, LLC, a subsidiary of Columbia Energy Partners, LLC, filed right-of-way (ROW) applications for... termination of a 29-mile- long, 230kV transmission line that would connect the proposed Echanis Wind Energy Project, located on private land on the north end of Steens Mountain, with Harney Electric Cooperative's...

  5. Interior sump/sewerage room from entry, view facing northeast U.S. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior sump/sewerage room from entry, view facing northeast - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Pumpwell, By-Pass Valve & Saltwater Pumphouse, North end of Fifth Street, between Dry Dock No. 1 & Facility GD2 , Pearl City, Honolulu County, HI

  6. Interior of sump/sewerage room looking up four levels, ladder on ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior of sump/sewerage room looking up four levels, ladder on pipe, view facing southwest - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Pumpwell, By-Pass Valve & Saltwater Pumphouse, North end of Fifth Street, between Dry Dock No. 1 & Facility GD2 , Pearl City, Honolulu County, HI

  7. Interior view of pump 4, taken from stairs looking down, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior view of pump 4, taken from stairs looking down, doorway to sump/sewerage room at bottom, tapered stairs, view facing east - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Pumpwell, By-Pass Valve & Saltwater Pumphouse, North end of Fifth Street, between Dry Dock No. 1 & Facility GD2 , Pearl City, Honolulu County, HI

  8. 2. VIEW, LOOKING EAST, SHOWING J. CLARK SALYER NATIONAL WILDLIFE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW, LOOKING EAST, SHOWING J. CLARK SALYER NATIONAL WILDLIFE REFUGE, JUST EAST OF WESTHOPE, NORTH DAKOTA (THE NORTH END OF THE REFUGE JUST SOUTH OF DAM 357 AND THE CANADIAN BORDER) - J. Clark Salyer National Wildlife Refuge Dams, Along Lower Souris River, Kramer, Bottineau County, ND

  9. 4. ARAI Shop and maintenance building ARA627. West side and ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. ARA-I Shop and maintenance building ARA-627. West side and north end. Camera facing southeast. Shows original (lower roofed section) and later addition. Metal building next to south end is related to decontamination and demolition activities. Ineel photo no. 1-7. - Idaho National Engineering Laboratory, Army Reactors Experimental Area, Scoville, Butte County, ID

  10. 9. ARAI Shop and maintenance building ARA627 interior view. Metal ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. ARA-I Shop and maintenance building ARA-627 interior view. Metal roll-up door on north end (rear) of building. Camera facing northeast. Ineel photo no. 1-12. - Idaho National Engineering Laboratory, Army Reactors Experimental Area, Scoville, Butte County, ID

  11. 1. OVERVIEW OF BUILDING 105 SHOWING LOCAL SETTING. ROOF, NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. OVERVIEW OF BUILDING 105 SHOWING LOCAL SETTING. ROOF, NORTH END, AND WEST SIDE OF BUILDING 105 ARE VISIBLE AT LEFT PHOTO CENTER BEHIND UTILITY POLE. ROOF AND WEST END OF BUILDING 110 ARE VISIBLE AT PHOTO RIGHT BEHIND TREES. VIEW TO SOUTH FROM STREET ABOVE HOUSES. - Big Creek Hydroelectric System, Powerhouse 8, Operator Cottage, Big Creek, Big Creek, Fresno County, CA

  12. Chemours Pompton Lakes Works Site, Pompton Lakes, NJ

    EPA Pesticide Factsheets

    E.I. DuPont De Nemours & Company manufactured explosives on this 570-acre site at the north end of Pompton Lakes, New Jersey from 1902-1994. Land use in the vicinity is primarily residential and commercial, but also includes undeveloped areas, an interstat

  13. 47. Detail of gears for steam powered Marine Railway #1, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    47. Detail of gears for steam powered Marine Railway #1, and drive equipment for Railways #l and #2, Marine Railway Headhouse, ground floor, north end, drive gears in foreground, pulling gears for Railway # 1 in background. - Thames Tow Boat Company, Foot of Farnsworth Street, New London, New London County, CT

  14. 6. PHOTOCOPY, FOUNDATION AND FLOOR PLAN DRAWING OF E.M. BARRACKS, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. PHOTOCOPY, FOUNDATION AND FLOOR PLAN DRAWING OF E.M. BARRACKS, N.C.O. AND OFFICERS QUARTERS. - NIKE Missile Base SL-40, Barracks No. 1, North end of base, southest of Basketball Court & northwest of Barracks No. 2, Hecker, Monroe County, IL

  15. Exterior direct view of underpass at grade level below north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Exterior direct view of underpass at grade level below north end and east side of Building 7, from courtyard looking west - North Beach Place, 431 Bay Street, 530 Francisco Street, 431 Bay Street, 530 Francisco Street, San Francisco, San Francisco County, CA

  16. 12. INTERIOR VIEW TO THE NORTH OF THE RESTROOM AND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. INTERIOR VIEW TO THE NORTH OF THE RESTROOM AND UTILITY ROOM AT THE NORTH END OF THE MAIN ENTRANCE HALLWAY OF THE ADMINISTRATION AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

  17. 4. VIEW OF A DRYLAID ROCK WALL (TY31772) ON THE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF A DRY-LAID ROCK WALL (TY-3177-2) ON THE KINGS CANYON ROAD WHERE BLADING AND GRADING WILL OCCUR. LOCATED AT MILEPOST 0.07 (ACCORDING TO THE ARCHAEOLOGICAL SITE RECORD FOR TY-3177). TAKEN FROM THE NORTH END OF THE WALL, FACING SOUTH 24ø WEST (214ø). - Kings Canyon Road, Carson City, Carson City, NV

  18. 16. VIEW OF DRYLAID ROCK WALL (TY317724) ON THE DOWNSLOPE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. VIEW OF DRY-LAID ROCK WALL (TY-3177-24) ON THE DOWNSLOPE SIDE OF KINGS CANYON ROAD. LOCATED AT MILEPOST 2.45 (ACCORDING TO THE ARCHAEOLOGICAL SITE RECORD FOR SITE TY-3177). PHOTO IS TAKEN FROM THE NORTH END OF THE FEATURE, FACING DUE WEST (2700). - Kings Canyon Road, Carson City, Carson City, NV

  19. Managing Phytophthora ramorum at Bloedel Reserve

    Treesearch

    Darren Strenge; Marianne Elliott; Gary Chastagner; Casey Sclar

    2017-01-01

    Bloedel Reserve is a 150-acre botanical garden and nature preserve on the north end of Bainbridge Island in Washington on the Puget Sound. The grounds encompass undeveloped forest, pastures, a bird marsh, woodland plantings, and intensely maintained gardens within the limits of the City of Bainbridge Island. The garden is part of the Sentinel Plant Network, a...

  20. Interior, main room , Burton Park Club House, view to ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior, main room , Burton Park Club House, view to south from north end door (90mm lens). Front doors visible at left, fireplace at right, while kingpost trusses supports the roof. - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

  1. 13. Photocopy of photograph, U.S. Army, ca. 1943 (original print ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    13. Photocopy of photograph, U.S. Army, ca. 1943 (original print located at Rocky Mountain Arsenal, Commerce City, Colorado). R.M.A. - 412 - FILLING ROOM NORTH END. - Rocky Mountain Arsenal, Mustard Manufacturing-Filling Building, December Seventh Avenue & D Street, Commerce City, Adams County, CO

  2. 18. Interior view of large unoccupied meeting/gathering room looking towards ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. Interior view of large unoccupied meeting/gathering room looking towards small stage and opened doorway to exterior vestibule; showing through wall air conditioning unit; north end of east wing on main floor; view to southwest. - Ellsworth Air Force Base, Group Administration & Secure Storage Building, 2372 Westover Avenue, Blackhawk, Meade County, SD

  3. 17. Interior view of courtroom looking towards judge's bench; showing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. Interior view of courtroom looking towards judge's bench; showing built in linear seating on both ends of room, clerical desk and equipment, through wall air conditioning units, exterior windows and door; north end of west wing on top floor; view to northwest. - Ellsworth Air Force Base, Group Administration & Secure Storage Building, 2372 Westover Avenue, Blackhawk, Meade County, SD

  4. 58. DETAIL OF SLC3W UMBILICAL MAST CONTROL PANEL LOCATED ON ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    58. DETAIL OF SLC-3W UMBILICAL MAST CONTROL PANEL LOCATED ON WEST SIDE OF MAST TRENCH APPROXIMATELY HALF WAY BETWEEN THE NORTH END OF TRENCH AND LAUNCHER - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  5. Morpheus Preparations for the Next Try of Campaign 5, Free Fligh

    NASA Image and Video Library

    2014-12-15

    Engineers and technicians prepare NASA's Project Morpheus prototype lander for free flight test No. 15 at the north end of the Shuttle Landing Facility at Kennedy Space Center in Florida. During the 97-second test, onboard autonomous landing and hazard avoidance technology sensors, or ALHAT, surveyed the hazard field for safe landing sites, then guided the lander forward and downward to a successful landing.

  6. 45. 1915 CLOTH ROOM ADJACENT TO PICKER ROOM, SECOND FLOOR, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    45. 1915 CLOTH ROOM ADJACENT TO PICKER ROOM, SECOND FLOOR, NORTH END OF MILL NO. 2, WALL ON LEFT DIVIDING CLOTH ROOM ADDED LATER (PROBABLY C. 1970s). - Prattville Manufacturing Company, Number One, 242 South Court Street, Prattville, Autauga County, AL

  7. 30. XX byproducts building (containing coke gas compressors at north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    30. XX by-products building (containing coke gas compressors at north end, ammonia stills in south end), #20 coal conveyor jutting out of top on east side, continuing out west side to bunker. Looking south/southeast - Rouge Steel Company, 3001 Miller Road, Dearborn, MI

  8. 22. TRANSPORTING STEEL FLOOR PLATES ON HAND CART TO NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. TRANSPORTING STEEL FLOOR PLATES ON HAND CART TO NORTH END OF BRIDGE. NOTE RETAINING ANGLE FOR SURFACING AT CUT-SIDE EDGE OF FLOOR PLATES. NOTE TUNNELS IN TOP OF ROCK FACE FOR MAIN CABLES - Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon, Coconino County, AZ

  9. DETAIL OF STEEL PLATE SET INTO THE CONCRETE SLAB OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL OF STEEL PLATE SET INTO THE CONCRETE SLAB OF THE NORTH END OF THE ABOVE-GROUND PORTION. VIEW FACING NORTH - U.S. Naval Base, Pearl Harbor, Ford Island 5-Inch Antiaircraft Battery, Battery Command Center, Ford Island, Pearl City, Honolulu County, HI

  10. A Comparison of L-Band and C-Band Multipath Propagation at Edwards AFB

    DTIC Science & Technology

    2011-09-02

    output was applied to a Cobham M/A-COM SMR-5550i microwave receiver, and the resulting Antennas 1, 2 Antenna 3 Antenna 4 to north end of taxiway E to...separate Cobham M/A-COM SMR-5550i microwave receivers. The IF signals were applied a switch whose dwell time in each position was 200 µs as explained in the

  11. 25. Photocopy of a photograph (original print in the collection ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Photocopy of a photograph (original print in the collection of the New Hampshire Water Resources Board, Concord, New Hampshire) 1927, photographer unknown 2 3/8 X 4 inch negative VIEW OF THE NORTH END OF THE OLD TIMBER DAM AT DAM SITE No. 3 - Claremont Village Industrial District, Between B, Claremont, Sullivan County, NH

  12. 43. 'Firing Pier, Third and Fourth Floors and Roof Plan,' ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    43. 'Firing Pier, Third and Fourth Floors and Roof Plan,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3869-46, Y&D Drawing 190843. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  13. 39. 'Firing Pier, First Floor Plan, Section No. 4,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    39. 'Firing Pier, First Floor Plan, Section No. 4,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3865-46, Y&D Drawing 190839. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  14. 33. 'Firing Pier, Elevations, North & South,' submitted 29 December ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    33. 'Firing Pier, Elevations, North & South,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3870-46, Y&D Drawing 190844. Scales as noted. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  15. 41. 'Firing Pier, Second Floor Plan, Section No. 2,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    41. 'Firing Pier, Second Floor Plan, Section No. 2,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3867-46, Y&D Drawing 190841. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  16. 32. 'Firing Pier, Elevation, West,' submitted 29 December 1941 by ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. 'Firing Pier, Elevation, West,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3872-46, Y&D Drawing 190846. Scale 1/8' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  17. 19. Interior first level view looking north within forward (north) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. Interior first level view looking north within forward (north) section of firing pier. Objects pictured include torpedo cart (left), floor-mounted roller tray (extending to lower right), and (at center rear), deck-type firing tube. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  18. 40. 'Firing Pier, Second Floor Plan, Section No. 1,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    40. 'Firing Pier, Second Floor Plan, Section No. 1,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3866-46, Y&D Drawing 190840. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  19. 42. 'Firing Pier, Second Floor Plan, Section No. 3,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    42. 'Firing Pier, Second Floor Plan, Section No. 3,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3868-46, Y&D Drawing 190842. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  20. 37. 'Firing Pier, First Floor Plan, Section No. 2,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    37. 'Firing Pier, First Floor Plan, Section No. 2,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3863-46, Y&D Drawing 190837. Scale 1/4' = 1. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  1. 34. 'Firing Pier, Longitudinal Sectional Elevation, Looking East,' submitted 29 ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. 'Firing Pier, Longitudinal Sectional Elevation, Looking East,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3873-46, Y&D Drawing 190847. Scale 1/8' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  2. 38. 'Firing Pier, First Floor Plan, Section No. 3,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    38. 'Firing Pier, First Floor Plan, Section No. 3,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3864-46, Y&D Drawing 190838. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  3. 36. 'Firing Pier, First Floor Plan, Section No. 1,' submitted ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    36. 'Firing Pier, First Floor Plan, Section No. 1,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3862-46, Y&D Drawing 190836. Scale 1/4' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  4. 14. View south from first level roof of firing pier. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    14. View south from first level roof of firing pier. Pitched corrugated metal roof marks location of the frame approach connecting the firing pier to the shop (shown in left distance). - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  5. 31. 'Firing Pier, Elevation, East,' submitted 29 December 1941 by ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    31. 'Firing Pier, Elevation, East,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3871-46, Y&D Drawing 190845. Scale 1/8' = 1' - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  6. 35. 'Firing Pier, Cross Sections, Looking South,' submitted 29 December ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    35. 'Firing Pier, Cross Sections, Looking South,' submitted 29 December 1941 by John Brackett, Consulting Engineer, to Public Works Department, Bureau of Yards & Docks. PW Drawing 3874-46, Y&D Drawing 190848. Scale 1/8' = 1'. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  7. 36 CFR 7.50 - Chickasaw Recreation Area.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... speed in the following locations: (i) The Guy Sandy arm north of the east/west buoy line located near Masters Pond. (ii) The Guy Sandy Cove west of the buoy marking the entrance to the cove. (iii) Rock Creek... along the north shore of the Buckhorn Creek arm starting at the north end of the Buckhorn Boat Ramp...

  8. Currents and Undercurrents: An Administrative History of Lake Roosevelt National Recreation Area.

    ERIC Educational Resources Information Center

    McKay, Kathryn L.; Renk, Nancy F.

    The 1,259-mile Columbia River flows out of Canada and across eastern Washington state, forming the border between Washington and Oregon. In 1941 the federal government dammed the Columbia River at the north end of Grand Coulee, creating a man-made reservoir named Lake Roosevelt that inundated homes, farms, and businesses, and disrupted the lives…

  9. White Sands Space Harbor Area 1, Microwave Scanning Beam Landing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    White Sands Space Harbor Area 1, Microwave Scanning Beam Landing Ground Stations, 1,500' to the south of the north end of Runway 17/35; 1,500' to the west of the east end of Runway 23/05; and 1,500' southwest of the northeast end of Runway 20/02., White Sands, Dona Ana County, NM

  10. 33 CFR 110.145 - Narragansett Bay, R.I.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... north end of the wharf at Beaver Head. (i) Temporary floats or buoys for marking anchors or moorings in.... In the central and southern portion of Dutch Island Harbor, north of a line ranging 106° from Beaver Head Point Shoal Buoy 2 toward the Jamestown standpipe; east of a line ranging 14° from Beaver...

  11. 15. View showing junction of compression diagonal, vertical member, tension ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. View showing junction of compression diagonal, vertical member, tension diagonal, and lower chord members between 5th and 6th panels from north end of north span, looking from the east - Bridge No. 4900, Spanning Root River at Trunk Highway 16, Rushford, Fillmore County, MN

  12. 18. Photocopy of photograph. Horgan, date unknown. Original negative can ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    18. Photocopy of photograph. Horgan, date unknown. Original negative can be found in D & H collection of the Anthracite Heritage Museum, Scranton, Pennsylvania. DETAIL VIEW OF SLUSH TROUGH FROM BREAKER NO. 2 TO BOREHOLE UNDER NORTH END OF BOILER HOUSE NO. 2, LOOKING SOUTH - Marvine Colliery, Breaker No. 2, West side Boulevard Avenue, between East Parker Street & Route 380, Scranton, Lackawanna County, PA

  13. 1. View from Roundhouse roof showing remains of gable (north) ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. View from Roundhouse roof showing remains of gable (north) end and clerestory monitor of Machine Shop. - Central of Georgia Railway, Savannah Repair Shops & Terminal Facilities, Machine Shop, Bounded by West Broad, Jones, West Boundary & Hull Streets, Savannah, Chatham County, GA

  14. 6. Historic American Buildings Survey (Fed.) Stanley P. Mixon, Photographer ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. Historic American Buildings Survey (Fed.) Stanley P. Mixon, Photographer March 18, 1940, (F) EXT. DETAIL VIEW OF NORTH END GABLES, KITCHEN WING IN FOREGROUND. - Wyckoff-Bennett House, Kings Highway & 1669 East Twenty-second Street, Brooklyn, Kings County, NY

  15. 1. EXTERIOR VIEW OF BOILER HOUSE FROM SOUTHWEST. THE BOILER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. EXTERIOR VIEW OF BOILER HOUSE FROM SOUTHWEST. THE BOILER HOUSE WAS USED FOR HEATING THE MILL; HYDRO-ELECTRIC POWER FOR PRODUCTION WAS PURCHASED FROM THE COLUMBUS LIGHT & POWER COMPANY. NORTH END OF 1924 MILL TO RIGHT, c. 1970 WINDOWLESS WEAVE ROOM ADDITION TO LEFT. - Stark Mill, Boiler House, 117 Corinth Road, Hogansville, Troup County, GA

  16. 9. DETAIL VIEW OF INTERIOR OF BREAKER, FIRST FLOOR, DEPICTING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. DETAIL VIEW OF INTERIOR OF BREAKER, FIRST FLOOR, DEPICTING CHUTES AND ELECTRIC MOTOR, LOOKING EAST-SOUTHEAST FROM ELEVATED PLATFORM AT NORTH END - Marvine Colliery, Breaker No. 2, West side Boulevard Avenue, between East Parker Street & Route 380, Scranton, Lackawanna County, PA

  17. 2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. UPSTREAM SIDE OF DAM AND BRIDGE WITH ABANDONED SAN TAN FLOOD-WATER HEADGATE IN FOREGROUND. TAKEN FROM NORTH END OF DAM - San Carlos Irrigation Project, Sacaton Dam & Bridge, Gila River, T4S R6E S12/13, Coolidge, Pinal County, AZ

  18. 15. Interior firstlevel view looking north within rear section of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. Interior first-level view looking north within rear section of firing pier. Debris includes a junked torpedo firing tube mounted on a dolly. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  19. Wind Texture

    NASA Image and Video Library

    2010-10-06

    This image from NASA Mars Odyssey shows a region on the north end of Gordii Dorsum. Wind is the main source of erosion in this region, so the unusual texture may indicate that the surface material in this region is different from nearby regions.

  20. 22. Photographic copy of blueprints and plans (from the originals ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. Photographic copy of blueprints and plans (from the originals in possession of Detroit District, U.S. Army Corps of Engineers, Duluth, Minnesota). North pier of Duluth Canal, 1899, timber molds for concrete superstructure - Duluth Ship Canal, North Pier, North end of Minnesota Point at Canal Park, Duluth, St. Louis County, MN

  1. 8. Interior view of unoccupied office space; showing exterior windows, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. Interior view of unoccupied office space; showing exterior windows, exterior door at far left, and opened doorway to corridor; north end of east wing on top floor; view to southeast. - Ellsworth Air Force Base, Group Administration & Secure Storage Building, 2372 Westover Avenue, Blackhawk, Meade County, SD

  2. 33 CFR 165.T09-0333 - Safety zone; Marathon Oil Refinery construction, Rouge River, Detroit, MI.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...′ W, along the shore northwest to a point on land at position 42°17.8′ N; 083°9.0′ W, continuing back... safety zone effectively covers all of the Rouge River from the Dix Ave. bridge to the north end of...

  3. 19. Jet Lowe, Photographer, June 1979. SECOND FLOOR, INTERIOR, NORTH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. Jet Lowe, Photographer, June 1979. SECOND FLOOR, INTERIOR, NORTH END, SHOWING REMAINS OF FLOUR AND WHEAT BINS, PLATFORM FLOUR SIFTERS, D.C. GENERATOR FROME, SALEM MACHINE WORKS FLOUR MIXER AND SPROUT, WALDRON AND CO. CENTRIFUGAL REEL. - Womack's Mill, Yanceyville, Caswell County, NC

  4. 2. VIEW OF WEST FACE OF LAUNCH OPERATIONS BUILDING. BUNKER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. VIEW OF WEST FACE OF LAUNCH OPERATIONS BUILDING. BUNKER PERISCOPE VISIBLE ON NORTH END OF ROOF. ESCAPE TUNNEL AND CABLE SHED VISIBLE ON NORTH FACE. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Operations Building, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  5. 4. Historic American Buildings Survey PHOTOCOPY CA. 1916 OF FRENCH ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Historic American Buildings Survey PHOTOCOPY CA. 1916 OF FRENCH ROOM LOOKING AT NORTH END OF ROOM. WALLS COVERED IN SILK WITH HAND- EMBROIDERED APPLIQUES. NOTE CARVINGS AND MOLDINGS IN WHITE GUM WOODWORK. FLOORS ARE PARQUET. Original in Collections of Marian College - James A. Allison Mansion, 3200 Coldspring Road, Indianapolis, Marion County, IN

  6. Interior view of double steel entry doors at bottom of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Interior view of double steel entry doors at bottom of stair leading to street level, note painted glass panes on upper portion of doors, view facing southeast - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Pumpwell, By-Pass Valve & Saltwater Pumphouse, North end of Fifth Street, between Dry Dock No. 1 & Facility GD2 , Pearl City, Honolulu County, HI

  7. 4. Photocopy of photograph (original print located at Southern California ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. Photocopy of photograph (original print located at Southern California Edison Company Corporate Offices, Rosemead, California). Photographer unknown, pre-1970. PLANT 2 AND COTTAGES EMPHASIZING NORTH END OF COMPLEX. VIEW TO WEST. - Bishop Creek Hydroelectric System, Plant 2, Bishop Creek, Bishop, Inyo County, CA

  8. 11. Connection of upright structural members to top of arch ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. Connection of upright structural members to top of arch member on east side of north end of bridge. Oblique detail view southwest (from beside bridge). 360 mm lens. - Gault Bridge, Spanning Deer Creek at South Pine Street, Nevada City, Nevada County, CA

  9. 16. View of riveted gusset plate connection between compression diagonal, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. View of riveted gusset plate connection between compression diagonal, tension diagonal, and lateral brace at center of 4th panel from north end of west truss of north span, looking from the east - Bridge No. 4900, Spanning Root River at Trunk Highway 16, Rushford, Fillmore County, MN

  10. 78 FR 26345 - York Haven Power Company, LLC; Notice of Application Accepted for Filing, Soliciting Motions To...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-06

    ... nature-like fishway to enhance fish passage facilities at the project. No other new developments or... headrace wall, main dam, east channel dam, powerhouse, and forebay bulkhead. The stone masonry headrace... feet, directs flow to the powerhouse. The main dam is attached to the north end of the headrace where...

  11. DETAIL OF THE UNDERSIDE OF THE BRIDGE, ABUTMENT, AND WING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    DETAIL OF THE UNDERSIDE OF THE BRIDGE, ABUTMENT, AND WING WALL ON THE EAST SIDE OF THE NORTH END OF THE BRIDGE. 38 - Burlington Northern Santa Fe Railroad, Cajon Subdivision, Structure No. 61.5X, between Cajon Summit and Keenbrook, Devore, San Bernardino County, CA

  12. VIEW TO THE NORTH TOWARD THE WING WALL AND CONCRETESLAB ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW TO THE NORTH TOWARD THE WING WALL AND CONCRETE-SLAB CHANNEL WALL ON THE WEST SIDE OF THE NORTH END OF THE BRIDGE. NOTE THE SMALL CULVERT OPENING BEHIND SAGEBRUSH NEAR THE END OF THE WING WALL. 37 - Burlington Northern Santa Fe Railroad, Cajon Subdivision, Structure No. 61.5X, between Cajon Summit and Keenbrook, Devore, San Bernardino County, CA

  13. 76 FR 4818 - Drawbridge Operation Regulation; Old Brazos River, Freeport, Brazoria County, TX

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-27

    ... operation of the Union Pacific Railroad Swing Span Bridge across the Old Brazos River, mile 4.4, at Freeport... February 10, 2011 until 7 a.m. on February 16, 2011. This deviation will allow the swing span of the bridge to remain in the closed-to-navigation position in order for the north end of the swing span to be...

  14. Hydrothermal remobilisation around a deformed and remobilised komatiite-hosted Ni-Cu-(PGE) deposit, Sarah's Find, Agnew Wiluna greenstone belt, Yilgarn Craton, Western Australia

    NASA Astrophysics Data System (ADS)

    Le Vaillant, Margaux; Saleem, Ahmad; Barnes, Stephen J.; Fiorentini, Marco L.; Miller, John; Beresford, Steve; Perring, Caroline

    2016-03-01

    The Sarah's Find nickel deposit, located 4.5 km north of the Mount Keith nickel mine, Western Australia, was chosen as a case study to investigate the nature and three-dimensional geometry of a geochemical halo created by the hydrothermal remobilisation of base metals and platinum group elements into the country rock surrounding a small massive Ni sulphide orebody. Portable and laboratory-based XRF analyses were carried out on samples from a shear zone localised along the basal komatiite-dacite contact that hosts the orebody. A geochemical halo was identified that extends along the shear zone up to 1780 m away from the massive sulphides, parallel to a prominent stretching lineation. Elevated Ni and Pd are associated with high As, Co, Cu and S. Palladium and Pt concentrations increase with proximity to massive sulphides (from 6 to 1190 ppb Pd). These anomalous concentrations reflect the presence of sulfarsenides and sulphides, either physically remobilised and forming veinlets close to the massive sulphides, or hydrothermally transported and redeposited within the foliation. In situ laser ablation ICP-MS indicates that Pd and Pt are hosted within these nickel sulfarsenides. This Ni-Co-As-Pd geochemical halo, observed around the Sarah's Find ore body, is interpreted as forming syn deformation, by the circulation of As-rich hydrothermal fluids dissolving base metals, Pd and Pt from the orebody and redepositing them along the sheared footwall contact. Similar Ni-Co-Pd-Pt-As geochemical haloes could potentially exist around any magmatic nickel sulphide mineral system that has undergone a phase of arsenic metasomatism and may be a generally applicable proximity indicator for nickel sulphides in hydrothermally altered terranes.

  15. Dal'negosrk skarn deposit, Sikhote-Alin: Stages and sources of matter for borosilicate ores

    NASA Astrophysics Data System (ADS)

    Karas', O. A.; Ratkin, V. V.

    2014-04-01

    The danburite orebody at the northeastern wall of the open pit of the Dal'negorsk borosilicate deposit is studied. The comparative mineralogical-, isotopic-, and thermobarogeochemical analyses of danburite from the Levoberezhnyi area and datolite of the late skarn stage from the Tsentral'nyi open pit confirms that danburite is a result of the early borosilicate stage of formation of the deposit. Combined with previously published data, it is concluded that marine sedimentary rocks or Early Cretaceous arkose sandstones from the matrix of the Taukhin accretionary prism could be the source of boron.

  16. The Permian-Triassic granitoids in Bayan Obo, North China Craton: A geochemical and geochronological study

    NASA Astrophysics Data System (ADS)

    Ling, Ming-Xing; Zhang, Hong; Li, He; Liu, Yu-Long; Liu, Jian; Li, Lin-Qing; Li, Cong-Ying; Yang, Xiao-Yong; Sun, Weidong

    2014-03-01

    Granitoids near the Bayan Obo giant rare earth element (REE) deposit at the north margin of the North China Craton (NCC), the world's largest light REE (LREE) deposit, have been taken by some authors as the key factors that controlled the mineralization. In contrast, others proposed that the REE deposit has been partially destructed by these granitoids. Here we report systematic studies on geochronology and geochemical characteristics of granitoids of different distances from the orebodies, to investigate the genesis and their relationship to the giant Bayan Obo deposit. Granitoids studied here, including granites and quartz monzonites, are peraluminous with A/CNK = 0.99-1.11, LREE enriched and heavy REE (HREE) depleted, with variable REE concentrations (total REE = 54-330 ppm) and large negative Eu anomaly (δEu = 0.19-0.70). The REE patterns are distinct from those of ore-bearing dolomites. Some samples have slightly higher LREE concentrations, which may have been contaminated by the orebodies during intrusion. Trace elements of the granitoids are characterized by positive Pb anomaly, strong negative Ti anomaly and Nb, Ta and Sr anomalies. The granites exhibit negative Ba anomaly. The granitoids plot within the post-collision granite field in the Pearce diagram, which is consistent with the tectonic regime. The quartz monzonites and one granite have A-type granite characteristics and belong to the A2 subgroup. Zircons in these granitoids have high Th/U values, which are typical for magmatic zircons. High precision U-Pb dating for these zircons by secondary ion mass spectrometry (SIMS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) yields Permian-Triassic 206Pb/238U ages ranging from 243.2 to 293.8 Ma. The formation of the granitoids is > 55 Ma later than the latest ore forming age. The zircons have low La concentrations (0.02-12 ppm), high (Sm/La)N (0.8-685) and Ce/Ce* (1.4-80). The Ti-in-zircon temperature of the granitoids ranges

  17. Magmatic conduit melt-fluid metallogenic system- A new Genetic Model for Xishimen Iron Deposit, Wuan area, Hebei province, China

    NASA Astrophysics Data System (ADS)

    SU, S.; Hou, J.; Luo, Z.; Cui, Y.; Yang, Y.

    2015-12-01

    Xishimen Iron deposit is located in Wuan city, Hebei province, China. it is a typical skarn deposit, but some geological characteristics in the deposit cannot been explained by skarn model. We will try to reveal the genetic mechanism of the iron deposit¢s in this paper. Orebodys mainly occur along the boundary of diorite and metalimestone in the Xishimen iron deposit. Some orebodys intruded into diorites or limestones. There are vesicles in some massive ores. Magnetite from the lower part of orebody occur between diopside and tremolite as an intersititial minerals. Magnetites from upper part of the orebody are eqilibrium with calcite, apatite, Talc, pyrite and chalcopyrite. Magnetites coexisting with dioposide, tremolite and phlogopite have more than 15000 ppm TiO2, and riched in SiO2. However, magnetites coexisting with calcite, talc and sulfides have 200 ppm- 400 ppm TiO2, and poored in SiO2. Magnetites coexisting with talc have highest Al2O3, MgO, and MnO. Magnetites coexisting with calcite and sulfide have lowest Al2O3, MnO and MgO. Trace element analysis results of magnetite show that magnetite coexisting with dioposide, tremolite and phlogopite are riched in Ti and Ta, and depleted Nb and Y. Magnetite coexisting with calcite, talc and sulfide are usually have poor positive or no anomaly of Ti and Ta, and have poor positive anomaly of Nb, Hf, and Y. The analysis results of Fe isotope for ores and rocks in Xishimen iron deposit show that there is a negative correlation relationship between altitude and the value of Fe isotope. The heavy Fe isotopes of ores are richer in the lower part than in the upper part. The origin processes of Xishimen iron deposit are: (1) mafic-intermediate magma riched in iron reacted with limestone, and make the "iron magma" formation; (2) Fluids are added into the metallogenic system continuously, and "iron magma" was getting less density; (3) "iron magma" bearing fluids uplifting along magma conduit because of fluid superpressure

  18. H-bonding scheme and cation partitioning in axinite: a single-crystal neutron diffraction and Mössbauer spectroscopic study

    NASA Astrophysics Data System (ADS)

    Gatta, G. Diego; Redhammer, Günther J.; Guastoni, Alessandro; Guastella, Giorgio; Meven, Martin; Pavese, Alessandro

    2016-05-01

    The crystal chemistry of a ferroaxinite from Colebrook Hill, Rosebery district, Tasmania, Australia, was investigated by electron microprobe analysis in wavelength-dispersive mode, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), 57Fe Mössbauer spectroscopy and single-crystal neutron diffraction at 293 K. The chemical formula obtained on the basis of the ICP-AES data is the following: ^{X1,X2} {{Ca}}_{4.03} Y ( {{{Mn}}_{0.42} {{Mg}}_{0.23} {{Fe}}^{2 + }_{1.39} } )_{Σ 2.04} ^{Z1,Z2} ( {{{Fe}}^{3 + }_{0.15} {{Al}}_{3.55} {{Ti}}_{0.12} } )_{Σ 3.82} ^{T1,T2,T3,T4} ( {{{Ti}}_{0.03} {{Si}}_{7.97} } )_{Σ 8} ^{T5} {{B}}_{1.96} {{O}}_{30} ( {{OH}} )_{2.18} . The 57Fe Mössbauer spectrum shows unambiguously the occurrence of Fe2+ and Fe3+ in octahedral coordination only, with Fe2+/Fe3+ = 9:1. The neutron structure refinement provides a structure model in general agreement with the previous experimental findings: the tetrahedral T1, T2, T3 and T4 sites are fully occupied by Si, whereas the T5 site is fully occupied by B, with no evidence of Si at the T5, or Al or Fe3+ at the T1- T5 sites. The structural and chemical data of this study suggest that the amount of B in ferroaxinite is that expected from the ideal stoichiometry: 2 a.p.f.u. (for 32 O). The atomic distribution among the X1, X2, Y, Z1 and Z2 sites obtained by neutron structure refinement is in good agreement with that based on the ICP-AES data. For the first time, an unambiguous localization of the H site is obtained, which forms a hydroxyl group with the oxygen atom at the O16 site as donor. The H-bonding scheme in axinite structure is now fully described: the O16- H distance (corrected for riding motion effect) is 0.991(1) Å and an asymmetric bifurcated bonding configuration occurs, with O5 and O13 as acceptors [i.e. with O16··· O5 = 3.096(1) Å, H··· O5 = 2.450(1) Å and O16- H··· O5 = 123.9(1)°; O16··· O13 = 2.777(1) Å, H··· O13 = 1.914(1) Å and O16- H··· O13 = 146

  19. Thallium-rich pyrite ores from the Apuan Alps, Tuscany, Italy:constraints for their origin and environmental concerns

    NASA Astrophysics Data System (ADS)

    D'Orazio, Massimo; Biagioni, Cristian; Dini, Andrea; Vezzoni, Simone

    2017-06-01

    The southern sector of the Apuan Alps (AA) massif, Tuscany, Italy, is characterized by the occurrence of a series of baryte-pyrite-iron oxide orebodies whose Tl-rich nature was recognized only recently. The geochemistry of the pyrite ore was investigated through inductively coupled plasma mass spectrometry. In addition, lead isotope data for selected pyrite ores from AA were collected. Pyrite ores are characterized by a complex geochemistry, with high concentrations of Tl (up to 1100 μg/g) coupled with high As and Sb contents; the Co/Ni ratio is always <1. Geochemical data of pyrite and marcasite ore samples from other mining districts of Tuscany have been collected in order to compare them with those from the AA. These samples usually have very low Tl content (less than 2 μg/g) and high to very high Co/Ni and As/Sb ratios. Only some samples from the Sb-Hg ore deposits showed very high Tl concentrations (up to 3900 μg/g). Another difference is related to the lead isotope composition, with pyrite ores from AA markedly less radiogenic than those from the other deposits from Tuscany. Geochemical data of pyrite ores from AA give new insights on the genesis of the baryte-pyrite-iron oxide orebodies, relating their formation to low-temperature hydrothermal systems active during early Paleozoic; in addition, these data play a fundamental role in assessing the environmental impact of these deposits.

  20. Three-dimensional oxygen isotope imaging of convective fluid flow around the Big Bonanza, Comstock lode mining district, Nevada

    USGS Publications Warehouse

    Criss, R.E.; Singleton, M.J.; Champion, D.E.

    2000-01-01

    Oxygen isotope analyses of propylitized andesites from the Con Virginia and California mines allow construction of a detailed, three-dimensional image of the isotopic surfaces produced by the convective fluid flows that deposited the famous Big Bonanza orebody. On a set of intersecting maps and sections, the δ18O isopleths clearly show the intricate and conformable relationship of the orebody to a deep, ~500 m gyre of meteoric-hydrothermal fluid that circulated along and above the Comstock fault, near the contact of the Davidson Granodiorite. The core of this gyre (δ18O = 0 to 3.8‰) encompasses the bonanza and is almost totally surrounded by rocks having much lower δ18O values (–1.0 to –4.4‰). This deep gyre may represent a convective longitudinal roll superimposed on a large unicellular meteoric-hydrothermal system, producing a complex flow field with both radial and longitudinal components that is consistent with experimentally observed patterns of fluid convection in permeable media.

  1. Mineralogy, textures, and relative age relationships of massive sulfide ore in the West Shasta district, California ( USA).

    USGS Publications Warehouse

    Howe, S.S.

    1985-01-01

    The Devonian massive sulfide orebodies of the West Shasta district in N California are composed primarily of pyrite, with lesser amounts of other sulfide and gangue minerals. Examination of polished thin sections of more than 100 samples from the Mammoth, Shasta King, Early Bird, Balaklala, Keystone, and Iron Mountain mines suggests that mineralization may be divided into 6 paragenetic stages, the last 5 each separated by an episode of deformation: 1) precipitation of fine-grained, locally colloform and framboidal pyrite and sphalerite; 2) deposition of fine-grained arsenopyrite and coarse-grained pyrite; 3) penetration and local replacement of sulfide minerals of stages 1 and 2 along growth zones and fractures by chalcopyrite, sphalerite, galena, tennantite, pyrrhotite, bornite, and idaite; 4) recrystallization and remobilization of existing minerals; 5) deposition of quartz, white mica, chlorite, and calcite; and 6) formation of bornite, digenite, chalcocite, and covellite during supergene enrichment of several orebodies at the Iron Mountain mine. Mineralogic and textural evidence do not support a second major episode of massive sulfide mineralization during the Permian. -from Author

  2. Improvement of a method for positioning of pithead by considering motion of the surface water

    NASA Astrophysics Data System (ADS)

    Yi, H.; Lee, D. K.

    2016-12-01

    Underground mining has weakness compared with open pit mining in aspects of efficiency, economy and working environment. However, the method has applied for the development of a deep orebody. Development plan is established when the economic valuation and technical analysis of the deposits is completed through exploration of mineral resources. Development is a process to open a passage from the ground surface to the orebody as one of the steps of mining process. In the planning, there are details such as pithead positioning, mining method selection, and shaft design, etc. Among these, pithead positioning is implemented by considering infrastructures, watershed, geology, and economy. In this study, we propose a method to consider the motion of the surface waters in order to improve the existing pithead positioning techniques. The method contemplates the terrain around the mine and makes the surface water flow information. Then, the drainage treatment cost for each candidate location of pithead is suggested. This study covers the concept and design of the scheme.

  3. Timing of the formation of the Changba-Lijiagou Pb-Zn ore deposit, Gansu Province, China: Evidence from Rb-Sr isotopic dating of sulfides

    NASA Astrophysics Data System (ADS)

    Hu, Qiaoqing; Wang, Yitian; Mao, Jingwen; Wei, Ran; Liu, Shengyou; Ye, Dejin; Yuan, Qunhu; Dou, Ping

    2015-05-01

    The giant Changba-Lijiagou Pb-Zn deposit is located in the north of the Xihe-Chengxian (abbreviated as "Xicheng") ore cluster in Gansu Province, China. The orebodies in the deposit are mainly hosted in the marble, dolomitic marble, and biotite-calcite-quartz schist of the Middle Devonian Anjiacha Formation. The genesis of the deposit has previously been argued to be of SEDEX type (sedimentary exhalative type) or of epigenetic hydrothermal type. This paper reports results of Rb-Sr isotopic dating on sphalerite and pyrite taken from the main orebody, which yield an isochron age of 222.3 ± 2.2 Ma for eight sphalerite samples, and 222.0 ± 3.0 Ma for the eight sphalerite samples combined with four pyrite samples, indicating that the deposit formed during the Late Triassic. The (87Sr/86Sri) value of the sphalerite is 0.71370 ± 0.00013, and that of the sphalerite and pyrite is 0.71371 ± 0.00014, which are identical within experimental error, suggesting that the ore metals are derived mainly from the continental crust. By integrating the present results with the regional geology, we propose that the Changba-Lijiagou Pb-Zn deposit is a product of regional hydrothermal mineralization processes, forced by tectono-magmatic activities, which took place in the Xicheng ore cluster during Triassic orogenic processes.

  4. Kimberlite emplacement models — The implications for mining projects

    NASA Astrophysics Data System (ADS)

    Jakubec, Jaroslav

    2008-06-01

    The significance of the emplacement model for kimberlite pipes, or sheets, is commonly recognized in resource geology. However, its importance is not always appreciated in the mine design process. The fact is that knowledge of the orebody geometry, character of the contact zones, internal structures, rock mass competency and distribution of inclusions could directly influence the selection of the underground mining method, pit wall stability, dilution, treatability, and the dewatering strategy. The problems are exacerbated in smaller pipes and narrower sheets, and in more irregular shapes; they are more apparent in underground mining as opposed to open cast. Various kimberlite emplacement processes have a major impact on the nature of the kimberlite orebody and host rocks that will influence the mine design and mining strategy. Failure to understand these processes can adversely affect the economic outcome for developing a mine. It is therefore important to investigate those processes in order to better characterize the mining constraints and risks, and more accurately predict the mine's economic viability.

  5. Fluid inclusion and noble gas studies of the Dongping gold deposit, Hebei Province, China: A mantle connection for mineralization?

    USGS Publications Warehouse

    Mao, J.; Li, Y.; Goldfarb, R.; He, Y.; Zaw, K.

    2003-01-01

    The Dongping gold deposit (>100 t Au) occurs about 200 km inboard of the northern margin of the North China craton. The deposit is mainly hosted by syenite of a middle Paleozoic alkalic intrusive complex that was emplaced into Late Archean basement rocks. Both groups of rocks are intruded by Late Jurassic to Early Cretaceous crustal-melt granite dikes and stocks, some within a few kilometers of the deposit. The gold ores were deposited during this latter magmatic period at about 150 Ma, a time that was characterized by widespread regional north-south compression that formed the east-west-trending Yanshan deformational belt. The ores include both the telluride mineral-bearing, low sulfide quartz veins and the highly K-feldspar-altered syenite, with most of the resource concentrated in two orebodies (1 and 70). Fluid inclusion microthermometry indicates heterogeneous trapping of low-salinity (e.g., 5-7 wt % NaCl equiv) fluids that varied from a few to 60 mole percent nonaqueous volatile species. Laser Raman spectroscopy confirms that the vapor phase in these inclusions is dominated by CO2, but may be comprised of as much as 9 mole percent H2S and 20 mole percent N2; methane concentrations in the vapor phase are consistently <1 mole percent. The variable phase ratios are consistent with fluid immiscibility during ore formation. Fluid inclusion trapping conditions are estimated to be 250?? to 375??C and 0.6 to 1.0 kbar. Helium isotope studies of fluid inclusions in ore-stage pyrites indicate He/He ratios of 2.1 to 5.2 Ra (Ra = 1.4 x 10-6 for air) for orebody 1 and 0.3 to 0.8 Ra for orebody 70. The former data suggest that at least 26 to 65 percent mantle helium occurs in the fluids that deposited the veins in orebody 1. The lower values for orebody 70, which is characterized by a more disseminated style of gold mineralization, are interpreted to reflect an increased interaction of ore fluids with surrounding crustal rocks, which may have contributed additional He to

  6. Alteration, oxygen isotope, and fluid inclusion study of the Meishan iron oxide-apatite deposit, SE China

    NASA Astrophysics Data System (ADS)

    Yu, Jinjie; Che, Linrui; Wang, Tiezhu

    2015-10-01

    The Meishan deposit (338 Mt at 39 % Fe) comprises massive ores in the main orebody and stockwork and disseminated ores along the main orebody. Four stages of mineralization and related alteration have been identified. The second stage of mineralization, which was the main stage of iron mineralization, formed stringer, disseminated iron ores, as well as the main Meishan orebody. The fourth stage formed small pyrite and/or gold orebodies above or alongside the main magnetite orebody. Stage 2 apatites have homogenization temperatures of 257-485 °C and salinities of 7.3-11 wt% NaCleq. Calculated δ18Ofluid values of magnetite and apatite from the disseminated ores vary between 7.7 and 14.9 ‰, which is similar to values observed in the massive ores (8.1-12.9 ‰). The high-18O fluids at Meishan have been interpreted as being of magmatic-hydrothermal origin. These fluids are indicative of the boiling of ore-forming fluids. Quartz, occurring as cavity fillings, gives homogenization temperatures from 202 to 344 °C, with most values lying between 250 and 330 °C. Corresponding salinities are ˜5 wt% NaCleq. Calculated δ18Ofluid values are +6.4 to +6.8 ‰. These values indicate that the lower-temperature (250-330 °C) quartz was deposited from a cooling magmatic-hydrothermal fluid. Stage 3 siderites contain fluid inclusions that homogenized between 190 and 310 °C, mainly between 210 and 290 °C. Corresponding salinities are 4-8 wt% NaCleq. Stage 4 quartz-carbonate veinlets contain fluid inclusions that homogenized at moderate to low temperatures (150-230 °C) and exhibit low salinities (2-10 wt% NaCl eq). δ18Ofluid values of the mineralizing fluids for the quartz and calcite can be calculated to vary from -0.7 to +5.6 ‰ and +6.3 to +10.2 ‰, respectively. While there is some overlap, the δ18O values of the fluids are generally lower than those observed in the massive and disseminated magnetite ores. δD values for the quartz and calcite vary between -154 and -123

  7. Long-Term Precipitation Database, Reynolds Creek Experimental Watershed, Idaho, United States

    NASA Astrophysics Data System (ADS)

    Hanson, C. L.

    2001-11-01

    An extensive precipitation database has been developed over the past 35 years with the first records starting in January 1962 and going through September 1996 from the Reynolds Creek Experimental Watershed located near the north end of the Owyhee Mountains in southwest Idaho. Precipitation ranges from 236 mm on the lowest elevations at the north end of the watershed to 1123 mm at the southwest corner of the watershed. There are continuous 35 year records available for 12 sites, 20-32 year records available for 8 sites, 10-19 year records available for 25 sites, and 4-9 year records for 8 sites for a total of 53 sites. All of these data have been stored as breakpoint and hourly records in the U.S. Department of Agriculture, Agricultural Research Service, Northwest Watershed Research Center database. These breakpoint and hourly data are available from the anonymous ftp site: ftp.nwrc.ars.usda.gov.

  8. 17. Photocopy of photograph (original copy in Edison collection). Photographer ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. Photocopy of photograph (original copy in Edison collection). Photographer and date unknown, although probably taken before 1920. VIEW OF NORTH END OF TULE RIVER POWERHOUSE SHOWING POWERHOUSE AT PHOTO CENTER, TRANSFORMER BUILDING TO RIGHT OF POWERHOUSE, GARAGE TO LEFT OF POWERHOUSE, AND OPERATOR COTTAGE BEHIND POWERHOUSE AND TRANSFORMER HOUSE. VIEW TO SOUTHEAST. - Tule River Hydroelectric Project, Water Conveyance System, Middle Fork Tule River, Springville, Tulare County, CA

  9. 12. "TEST STAND; STRUCTURAL; DEFLECTOR PIT DETAILS, SHEET NO. 1." ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. "TEST STAND; STRUCTURAL; DEFLECTOR PIT DETAILS, SHEET NO. 1." Specifications No. ENG-04-353-55-72; Drawing No. 60-09-12; sheet 41 of 148; file no. 1320/92, Rev. A. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  10. 10. "ARCHITECTURAL, SECTIONS AND DETAILS." Specifications No. ENG043535572; Drawing No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    10. "ARCHITECTURAL, SECTIONS AND DETAILS." Specifications No. ENG-04-353-55-72; Drawing No. 60-09-12; sheet 23 of 148; file no. 1320/74. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  11. 11. "INSTRUMENTATION AND CONTROL SYSTEMS, EQUIPMENT LOCATION, TEST STAND TERMINAL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    11. "INSTRUMENTATION AND CONTROL SYSTEMS, EQUIPMENT LOCATION, TEST STAND TERMINAL ROOM, PLANS AND SECTION." Specifications No. ENG-04-353-55-72; Drawing No. 60-0912; sheet 106 of 148; file no. 1321/57. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  12. 1. TEST STAND 1A ENVIRONS, SHOWING WEST SIDE OF TEST ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. TEST STAND 1-A ENVIRONS, SHOWING WEST SIDE OF TEST STAND 1-A, RP1 COMBINED FUEL STORAGE TANK FARM BELOW WATER TANKS ON HILLSIDE TO LEFT, AND TEST STAND 1-B IN DISTANCE AT RIGHT. Looking east. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  13. 9. "TEST STAND; STRUCTURAL; CABLE TUNNEL, PLAN, SECTIONS, DETAILS." Specifications ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. "TEST STAND; STRUCTURAL; CABLE TUNNEL, PLAN, SECTIONS, DETAILS." Specifications No. OC1-55-72-(Rev.); Drawing No. 60-09-12; sheet 43 of 148; file no. AF 1320/94, Rev. A. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  14. 25. "TEST STAND 1A UTILIZED TO TEST THE ATLAS ICBM", ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. "TEST STAND 1-A UTILIZED TO TEST THE ATLAS ICBM", CROPPED OUT: "DIRECTORATE OF MISSILE CAPTIVE TEST, EDWARDS AFB." Photo no. 11,371 57; G-AFFTC 15 OCT 57. Looking southwest from below the stand. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  15. 23. "A CAPTIVE ATLAS MISSILE EXPLODED DURING THE TEST ON ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    23. "A CAPTIVE ATLAS MISSILE EXPLODED DURING THE TEST ON TEST STAND 1-A, 27 MARCH 1959, PUTTING THAT TEST STAND OUT-OF-COMMISSION. STAND WAS NOT REPAIRED FOR THE ATLAS PROGRAM BUT TRANSFERRED TO ROCKETDYNE AND MODIFIED FOR THE F-l ENGINE PROGRAM." - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  16. 8. "TEST STAND, ARCHITECTURAL, FLOOR PLANS AND SCHEDULES." Specifications No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. "TEST STAND, ARCHITECTURAL, FLOOR PLANS AND SCHEDULES." Specifications No. ENG-04-353-55-72; Drawing No. 60-0912; sheet 22 of 148; file no. 1320/73. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A Terminal Room, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  17. 27. "TEST STAND; STRUCTURAL; SIDEWALL, NORTH WALL AND SOUTH WALL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. "TEST STAND; STRUCTURAL; SIDEWALL, NORTH WALL AND SOUTH WALL FRAMING ELEVATIONS." Specifications No. ENG-04353-55-72; Drawing No. 60-09-12; sheet 27 of 148; file no. 1320/78. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, Rev. B; date: 15 April 1957. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  18. 26. "TEST STAND, STRUCTURAL, FOUNDATION PLAN." Specifications No. ENG043535572; Drawing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    26. "TEST STAND, STRUCTURAL, FOUNDATION PLAN." Specifications No. ENG-04-353-55-72; Drawing No. 60-0912; sheet 25 of 148; file no. 1320/76. Stamped: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  19. 12. "OBSERVATION POSTS, STRUCTURAL PLANS AND DETAILS." Specifications No. OC25572; ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. "OBSERVATION POSTS, STRUCTURAL PLANS AND DETAILS." Specifications No. OC2-55-72; Drawing No. 60-09-12; sheet 89 of 148; file no. 1321/40, Rev. A. Very faint stamp above note reads: RECORD DRAWING - AS CONSTRUCTED. Below stamp: Contract no. 4338, no change. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  20. Test Plan for the Large-Scale Operations Management Test of Insects and Pathogens for Control of Water Hyacinth in Louisiana.

    DTIC Science & Technology

    1979-06-01

    north end of Lake Concordia in Concordia Parish, Louisiana, and filled with waterhyacinth plants col- lected from the population that grows naturally on... naturally occurring Arzama as a control agent for waterhyacinth lies in its temporary or seasonal effects on large plants . Research on procedures for...identify by block numiber) Aquatic plant control Waterhyacinths Insects Management methods Pathogens ft AWACT (Cmaonmo ee ebbMs san Ilmend identify by block

  1. 22. INTERIOR VIEW OF THE MACHINE SHOP LOOKING NORTH. FROM ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    22. INTERIOR VIEW OF THE MACHINE SHOP LOOKING NORTH. FROM LEFT TO RIGHT, NORTH END OF THE LONG LATHE, WOOD STOVE WITH A BRICK HEARTH FLOOR, FAR BACK LEFT CORNER IS THE MAIN CLUTCH FOR THE MILL POWER SHAFTS, SHAFT LATHE, SMALL PLANER, BORING MACHINE WITH IONIC COLUMN DETAIL., AND THE ENTRANCE TO THE ELECTRICAL MOTOR ROOM. - Standard Gold Mill, East of Bodie Creek, Northeast of Bodie, Bodie, Mono County, CA

  2. 27. INTERIOR VIEW TO THE WEST OF ROOM 126 AT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. INTERIOR VIEW TO THE WEST OF ROOM 126 AT THE NORTH END OF THE ENTRANCE HALLWAY TO THE POST-MORTEM CELLS. IN THE CEILING IS A HATCHWAY TO THE UPPER LEVEL OF ROOM 123, THE DISASSEMBLY BAY, BY WHICH PARTS OF THE NUCLEAR REACTOR WERE PASSED FOR FURTHER DISASSEMBLY IN THE VARIOUS POST-MORTEM CELLS. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

  3. Earth Observation

    NASA Image and Video Library

    2014-08-10

    ISS040-E-091153 (10 Aug. 2014) --- One of the Expedition 40 crew members aboard the International Space Station, flying at an altitude of 225 nautical miles, exposed this image of the south end of New Zealand's North Island on Aug. 10, 2014. Lake Wellington is just to the right of center frame. The north end of South Island is out of frame on the right side of Cook Strait at far right.

  4. 27. Bollinger twinchain tandem, pigcasting machine, located at the north ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. Bollinger twin-chain tandem, pig-casting machine, located at the north end of the plant. Prior to closing, approximately 40 percent of the plant's: iron production was cast into pigs and sold to foundry customers. The pig-casting machine employed a controller, lime man, trough man, and crane operator. - Central Furnaces, 2650 Broadway, east bank of Cuyahoga River, Cleveland, Cuyahoga County, OH

  5. Aerial Surveys of Endangered Whales in the Beaufort Sea, Chukchi Sea, and Northern Bering Sea.

    DTIC Science & Technology

    1981-06-01

    of Kivalina. The entire area from this point to the village of Wales was icebound. Figure 3 shows the typical ice conditions of the Bering Sea...area extending across the Bering Straits from Cape Prince of Wales to the north end of Little Diomede Island. Large concentrations of pan ice with a 7...ice conditions across the main area of sightings between Wales and Little Diomede Island throughout the survey effort. 8 !. I. I Beaufort Sea I.Brrow

  6. Morpheus Preparations for the Next Try of Campaign 5, Free Fligh

    NASA Image and Video Library

    2014-12-15

    NASA’s Project Morpheus prototype lander is moved into position at the north end of the Shuttle Landing Facility at Kennedy Space Center in Florida in preparation for free flight test No. 15. During the 97-second test, onboard autonomous landing and hazard avoidance technology sensors, or ALHAT, surveyed the hazard field for safe landing sites, then guided the lander forward and downward to a successful landing.

  7. 29. Aerial photograph (1973) looking south across Gould Island. Firing ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    29. Aerial photograph (1973) looking south across Gould Island. Firing pier (still possessing third and fourth levels) in foreground. Pitched roof extending from south end of firing pier marks location of frame approach between pier and shop building (center rear) and power plant (to right of shop). Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  8. 28. Undated aerial photograph taken prior to removal of third ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    28. Undated aerial photograph taken prior to removal of third and fourth levels of firing pier in the 1980s. View looking northwest shows harbor serving the firing pier, with craft berthed alongside the recovery dock and finger pier. Photo courtesy of Naval Undersea Warfare Center, Division Newport, Rhode Island. - Naval Torpedo Station, Firing Pier, North end of Gould Island in Narragansett Bay, Newport, Newport County, RI

  9. National Dam Safety Program. Drexel Lake Dam (MO 20046), Osage - Gasconade Basin, Bates County, Missouri. Phase I Inspection Report.

    DTIC Science & Technology

    1979-04-01

    and property of approximately four families and would potentially cause appreciable damage to the water treatment plant for the City of Drexel within...channel are moderately tree covered. (3) An intake structure for the water treatment plant is located in the dam about 130 feet north of the south...dam, to the water treatment plant located near the downstream face at the north end of the dam. (4) Water is pumped into Drexel Lake from another lake

  10. National Program for Inspection of Non-Federal Dams. Concord Water Works Dam (NH 00360), NHWRB Number 51.13, Merrimack River Basin, Concord, New Hampshire. Phase I Inspection Report.

    DTIC Science & Technology

    1980-03-01

    approximately 21.5 feet and is asphalt paved. The Concord Water Treatment Plant is located on the left abutment (north end) of the dam. The principal spillway...is located on the north side of the water treatment plant and consists of a granite block weir, 40 feet long, with flashboards and granite block...dam crest could cause damage to 6 to 8 houses, a community swimming pool, a factory, the pumping station at the water treatment plant , a town street

  11. 119. VIEW OF NORTH SIDE OF LANDLINE INSTRUMENTATION ROOM (206), ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    119. VIEW OF NORTH SIDE OF LANDLINE INSTRUMENTATION ROOM (206), LSB (BLDG. 751). POWER DISTRIBUTION UNITS AND CABLE DISTRIBUTION UNITS ON RIGHT SIDE OF PHOTO; LOGIC CONTROL AND MONITOR UNITS FOR BOOSTER AND FUEL SYSTEMS LEFT OF AND PARALLEL TO EAST ROW OF CABINETS; SIGNAL CONDITIONERS AT NORTH END OF ROOM PERPENDICULAR TO OTHER CABINETS. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 East, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

  12. 25. Photographic copy of ink on linen drawing (at the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Photographic copy of ink on linen drawing (at the archives of Niagara Mohawk Power Corporation, 300 Eric Boulevard West, Syracuse, New York 13202), Strand, Draftsman, July 3, 1913. Sheet 1-260, Finch, Pruyn & Company and International Paper Company. Detail of concrete dam and headgate wall. Detail showing profile of the north end of headgate wall. - Glens Falls Dam, 100' to 450' West of U.S. Route 9 Bridge Spanning Hudson River, Glens Falls, Warren County, NY

  13. Acoustic Behavior, Baseline Ecology and Habitat Use of Pelagic Odontocete Species of Concern

    DTIC Science & Technology

    2011-09-30

    measurements: 1) Quantitatively assess the acoustic signals of Hawaiian insular false killer whales (FKWs) and melon-headed whales (MHWs). 2...individual Hawaiian insular false killer and melon-headed whales . This project will be conducted over four, 2-week tagging periods spread between three...successfully deployed there on both FKWs and MHWs. The north end of the island is a high use area for Hawaiian insular false killer whales (Baird et al

  14. 17. A closeup detail, looking east from the northeast corner ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. A close-up detail, looking east from the northeast corner of the roadbed. This image shows the concrete commemorative inscription which is let into the inside of the eastern balustrade at the north end of the bridge. The name of one of the county commissioners has been chiselled out of the inscription. The parting fault between the parapet and its coping is evident. - Vigo County Bridge No. 139, Spanning Sugar Creek at Seventy-fourth Place, Terre Haute, Vigo County, IN

  15. Regional geochemical study of the felsic plutonic rocks in the Nuqrah Quadrangle, sheet 25E, Kingdom of Saudi Arabia

    USGS Publications Warehouse

    Hall, W.E.; Dellinger, David; Selner, G.I.

    1985-01-01

    Pan-concentration samples collected from wadis draining the north end of Jabal Safad contain anomalous Sn, Mo, Pb, and La. Four samples contain 250 to 1,000 ppm of tin. The tin anomaly is associated with a small aplitic pluton intrusive into the Jabal Safad alkalic granite complex. A brief reconnaissance of the area did not reveal any greisen or cassiterite mineralization. However, further exploration work in the area is recommended.

  16. 24. BUILDING NO. 452, ORDNANCE FACILITY (BAG CHARGE FILLING PLANT), ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    24. BUILDING NO. 452, ORDNANCE FACILITY (BAG CHARGE FILLING PLANT), INTERIOR VIEW LOOKING WEST AT NORTH END OF CENTRAL CORRIDOR (ROOM 3). STAIRWAY WORKBENCH WITH COMPRESSED-AIR POWERED CARTRIDGE LOADER. ARMORED PASS-THROUGH OF TRANSFER BOX FOR PASSING EXPLOSIVES MATERIALS THROUGH TO NEXT ROOM TO THE NORTH. - Picatinny Arsenal, 400 Area, Gun Bag Loading District, State Route 15 near I-80, Dover, Morris County, NJ

  17. Lake Chad, Chad, Africa

    NASA Technical Reports Server (NTRS)

    1982-01-01

    Once a great inland lake, Lake Chad (13.0N, 14.0E) in the Sahara Desert at the intersection of the African nations of Chad, Niger, Nigeria and Cameroon, is now in decline. The larger northern lobe is almost totally dry and slowly filling in with encroaching sand dunes. The southern lobe, still retains some water in the lower center but the water surface area is less than 2000 square kilometers and sand dunes are filling in the north end.

  18. Flow Encountering Abrupt Topography

    DTIC Science & Technology

    2013-09-30

    Colin at the Coral Reef Research Foundation and Paul Collins, who has extensive experience with such data). Helen Reef Concerted UCTD measurements...the main islands of Palau and diverts around the south and north ends of the island group (Figure 1, left and right; Section ). At Helen Reef and Toby...are very steep, mapping close to the reef fringe was done during daylight hours. At each of the southern islands, two or three circumnavigations of

  19. Caspian Sea Environmental Security Game: 16-17 November 1998

    DTIC Science & Technology

    1999-07-01

    Beginning at the north end of the sea, and following clockwise, Kazakhstan has the longest shoreline, 2700 km; Turkmenistan has the second longest, 1200 km...30.5 mt Copper 2700 1200 1060 863 11 mt Zinc a.) TES 1992, cited in Kaplin 1995. 67 containing 387,000 mt of suspended solids enters the Volga...Electricity INSC 1998b Russia Novovoronezh (Volgadonsk) PWR g (7 units) Electricity PNL 1998a VVER h (210 through 1000) INSC 1998e Rostov

  20. Radiological Survey and Remediation Report DRMO Yard

    DTIC Science & Technology

    1996-11-01

    as "affected" areas as defined by NUREG /CR-5849 Manual for Conducting Radiological Surveys in Support of License Termination, (NRC, 1992): The tire...requiring survey as defined by NUREG /CR-5849, due to the uncertainty of the boundary where crushing was performed in the north end of the yard. i The...identified the following areas as "affected" areas as defined by NUREG /CR-5849 Manual for Conducting Radiological Surveys in Support of I License

  1. Environmental Assessment and FONSI for the Joint United States/Republic of Korea Research and Development Study for Improved Underground Ammunition Storage Technologies Tests, Magdalena, New Mexico

    DTIC Science & Technology

    1994-09-01

    Linchburg Mine is located on the north end of the Magdalena Uplift, a horst block tectonic feature within the Rio Grande Rift/Depression. The Rio Grande...Uplift, to the south by the Mulligan Trough, and to the east by the Snake Ranch Trough, which are also tectonic features within the Rio Grande Rift...1.3.2.4 Seismioity. The Rio Grande Rift is the most seismically active area in New Mexico. Most of the seismic activity occurs between Albuquerque and

  2. Full Scale Wind Tunnel and Seaplane Tow Channel

    NASA Technical Reports Server (NTRS)

    1930-01-01

    Construction progress, Full Scale exit cone looking south from entrance cone, east switchboard, west switchboard, wind vanes at north end looking north through entrance cone, north end looking south through entrance cone, entrance cone looking north from exit cone, wind vanes south end of west exit cone, wind vanes south end of east exit cone, Tow Channel trolley lines looking north, east and west incline braces at north end. Full-Scale Tunnel (FST) exit cone construction and installation of fan motors. Smith DeFrance describes the entrance cone in NACA TR 459 as follows: 'Forward of the propellers and located on the center line of the tunnel is a smooth fairing which transforms the somewhat elliptic section of the single passage into two circular ones at the propellers. From the propellers aft, the exit cone is divided into two passages and each transforms in the length of 132 feet from a 35-foot 61/2-inch circular section to a 46-foot square. The included angle between the sides of each passage is 6 inches.' (p. 293)

  3. Siderite deposits in northern Italy: Early Permian to Early Triassic hydrothermalism in the Southern Alps

    NASA Astrophysics Data System (ADS)

    Martin, Silvana; Toffolo, Luca; Moroni, Marilena; Montorfano, Carlo; Secco, Luciano; Agnini, Claudia; Nimis, Paolo; Tumiati, Simone

    2017-07-01

    We present a minero-petrographic, geochemical and geochronological study of siderite orebodies from different localities of the Southern Alps (northern Italy). Siderite occurs as veins cutting the Variscan basement and the overlying Lower Permian volcano-sedimentary cover (Collio Fm.), and as both veins and conformable stratabound orebodies in the Upper Permian (Verrucano Lombardo and Bellerophon Fms.) and Lower Triassic (Servino and Werfen Fms.) sedimentary sequences of the Lombardian and the Venetian Alps. All types of deposits show similar major- and rare-earth (REE)-element patterns, suggesting a common iron-mineralizing event. The compositions of coexisting siderite, Fe-rich dolomite and calcite suggest formation from hydrothermal fluids at relatively high temperature conditions (≥ 250 °C). Geochemical modelling, supported by REE analyses and by literature and new δ13C and δ18O isotopic data, suggests that fluids responsible for the formation of siderite in the Variscan basement and in the overlying Lower Permian cover were derived from dominant fresh water, which leached Fe and C from volcanic rocks (mainly rhyolites/rhyodacites) and organic carbon-bearing continental sediments. On the basis of U-Th-Pb microchemical dating of uraninite associated with siderite in the Val Vedello and Novazza deposits (Lombardian Alps), the onset of hydrothermalism is constrained to 275 ± 13 Ma (Early-Mid Permian), i.e., it was virtually contemporaneous to the plutonism and the volcanic-sedimentary cycle reported in the same area (Orobic Basin). The youngest iron-mineralizing event is represented by siderite veins and conformable orebodies hosted in Lower Triassic shallow-marine carbonatic successions. In this case, the siderite-forming fluids contained a seawater component, interacted with the underlying Permian successions and eventually replaced the marine carbonates at temperatures of ≥ 250 °C. The absence of siderite in younger rocks suggests an Early Triassic

  4. A proactive approach to sustainable management of mine tailings

    NASA Astrophysics Data System (ADS)

    Edraki, Mansour; Baumgartl, Thomas

    2015-04-01

    The reactive strategies to manage mine tailings i.e. containment of slurries of tailings in tailings storage facilities (TSF's) and remediation of tailings solids or tailings seepage water after the decommissioning of those facilities, can be technically inefficient to eliminate environmental risks (e.g. prevent dispersion of contaminants and catastrophic dam wall failures), pose a long term economic burden for companies, governments and society after mine closure, and often fail to meet community expectations. Most preventive environmental management practices promote proactive integrated approaches to waste management whereby the source of environmental issues are identified to help make a more informed decisions. They often use life cycle assessment to find the "hot spots" of environmental burdens. This kind of approach is often based on generic data and has rarely been used for tailings. Besides, life cycle assessments are less useful for designing operations or simulating changes in the process and consequent environmental outcomes. It is evident that an integrated approach for tailings research linked to better processing options is needed. A literature review revealed that there are only few examples of integrated approaches. The aim of this project is to develop new tailings management models by streamlining orebody characterization, process optimization and rehabilitation. The approach is based on continuous fingerprinting of geochemical processes from orebody to tailings storage facility, and benchmark the success of such proactive initiatives by evidence of no impacts and no future projected impacts on receiving environments. We present an approach for developing such a framework and preliminary results from a case study where combined grinding and flotation models developed using geometallurgical data from the orebody were constructed to predict the properties of tailings produced under various processing scenarios. The modelling scenarios based on the

  5. The CHPM2030 H2020 Project: Combined Heat, Power and Metal extraction from ultra-deep ore bodies

    NASA Astrophysics Data System (ADS)

    Miklovicz, Tamas; Bodo, Balazs; Cseko, Adrienn; Hartai, Eva; Madarasz, Tamas

    2017-04-01

    The CHPM2030 project consortium is working on a novel technology solution that can provide both geothermal energy and minerals, in a single interlinked process. The CHPM technology involves an integrated approach to cross fertilize between two yet separated research areas: unconventional geothermal energy and mineral extraction. This places the project's research agenda onto the frontiers of geothermal resources development, mineral extraction and electro-metallurgy with the objectives of converting ultra-deep metallic mineral formations into an "orebody-enhanced geothermal system". In the envisioned facility, an EGS is established on a 3-4 km deep ore mineralisation. Metal content from the ore body is mobilised using mild leaching and/or nanoparticles, then metals are recovered by high-temperature, high-pressure geothermal fluid electrolysis and gas-diffusion electroprecipitation and electrocrystallisation. Salinity gradient power from pre-treated geothermal fluids will also be used. In the project, all these will be carried out at laboratory scale (technology readiness level of 4-5), providing data for the conceptual framework, process optimisation and simulations. Integrated sustainability assessment will also be carried out on the economic feasibility, social impact, policy considerations, environmental impact and ethics concerns. During the last stage of the research agenda, the work will focus on mapping converging technological areas, setting a background for pilot implementation and developing research roadmaps for 2030 and 2050. Pilot study areas include South West England, the Iberian Pyrite Belt in Portugal, the Banatitic Magmatic and Metallogenic Belt in Romania, and three mining districts in Sweden. The project started in January 2016 and lasts for 42 months. In the first phase, the metallogenesis of Europe was investigated and the potential ore formations have been identified. The rock-mechanical characteristics of orebodies have also been examined

  6. The origin of the Tongkeng-Changpo tin deposit, Dachang metal district, Guangxi, China: clues from fluid inclusions and He isotope systematics

    NASA Astrophysics Data System (ADS)

    Minghai, Cai; Jingwen, Mao; Ting, Liang; Pirajno, Franco; Huilan, Huang

    2007-08-01

    Tongkeng-Changpo is the largest tin deposit within the giant Dachang polymetallic tin ore field in Guangxi, southern China, which is part of a large skarn system associated with Cretaceous granitoids. The Tongkeng-Changpo mineralization consists of veins and stockworks in the upper levels and replacement stratiform orebodies (mantos) at lower levels. Based on textural relationships, three major mineralizing stages can be recognized: stage I with cassiterite, sulphides, stannite, tourmaline, and quartz; stage II with cassiterite, sulphides, sulphosalts, quartz, and calcite; and stage III with calcite as the main phase. The study of fluid inclusions has shown that there are two main fluid types: CO2 and NaCl-H2O. Homogenization temperatures are 270 to 365°C, 210 to 240°C, and 140 to 190°C for stages I, II, and III, respectively. Salinities range from 1 to 7 wt.% NaCl equiv. in the early ore stage and 3 to 10 wt.% NaCl equiv. in the late stages. Laser Raman Spectroscopy indicates that the inclusion fluids in stages I and II were of carbono-aqueous composition, with minor amounts of CH4 and H2S, whereas those in stage III were aqueous. Helium isotopic analyses of inclusion fluids indicate that the 3He/4He ratios in the ore veins are in between 1.2 to 2.9 Ra (Ra = 1.4 × 10-6, modern atmospheric ratio), and range from 1.6 to 2.5 Ra in the stratiform orebodies. This range of 3He/4He ratios is significantly higher than that of crustal fluids (0.01-0.05 Ra). The similar characteristics of fluid inclusions and their He isotopic composition, as well as age constraints, indicate that the ore veins and stratiform orebodies of the Tongkeng-Changpo deposit formed from the same hydrothermal system, likely related to granite intrusions of the Mesozoic Yanshanian tectono-thermal event. In addition, the high R/Ra ratios indicate a mantle contribution in the ore fluids.

  7. Arkachan: A new gold-bismuth-siderite-sulfide type of deposits in the West Verkhoyansky tin district, Yakutia

    NASA Astrophysics Data System (ADS)

    Gamyanin, G. N.; Vikent'eva, O. V.; Prokof'ev, V. Yu.; Bortnikov, N. S.

    2015-11-01

    The formation sequence of orebodies, chemical composition of gangue and ore minerals, fluid inclusions, REE patterns, 40Ar/39Ar isotopic age, and relationships of stable isotopes (C, O, S) in minerals of the Arkachan gold-bismuth-siderite-sulfide deposit have been studied. The deposit has been localized in the Kuranakh Anticlinorium of the Verkhoyansky Fold-Nappe Belt at the intersection of the near-meridional Kygyltas and the NE-trending North Tirekhtyakh faults. The orebodies are extended (>2 km) and steeply dipping zones of veins and veinlets are hosted in Carbonaceous and Permian sandstones and siltstones deformed in anticlines and cut through by dikes pertaining to diorite-granodiorite-granite association. The deposit was formed during hydrothermal-metamorphic, productive main gold, silver-polymetallic, and silver-antimony stages. The orebodies are largely composed of quartz and siderite; arsenopyrite, pyrite, and pyrrhotite are widespread; bismuthinite, chalcopyrite, sphalerite, galena, and bismuth sulfosalts (gustavite, cosalite, matildite) are less abundant. The REE patterns of carbonates and quartz are characterized by a negative Eu anomaly. Three types of fluid inclusions (FI) in quartz and carbonates are distinguished: (I) liquid H2O + CO2 ± CH4 + NaCl, (II) gaseous CO2 ± CH4, and (III) aqueous salt solutions. The homogenization temperature and salinity of FI I vary from 385 to 280°C and 18.8 to 26.2 wt % NaCl equiv, respectively, whereas in FI III these parameters vary from 261 to 324°C and 3.7 to 9.5 wt % NaCl equiv. The pressure is estimated at 1830 to 1060 bar. The δ18O of quartz II associated with siderite I, native gold, and sulfosalts changes from +13.6 to 16.3‰(SMOW); δ18O and δ13C of siderite I related to gold-ore stage vary from +13.6 to +17.7‰ (SMOW) and from-6.0 to-3.0 (PDB). A wide range of δ34S from-5.7 to 16.0‰ (CDT) has been obtained for sulfides. The isotopic 40Ar/39Ar age of muscovite is 101.9 ± 1.4 Ma. The isotopic

  8. Chemical and boron isotopic compositions of tourmaline from the Paleoproterozoic Houxianyu borate deposit, NE China: Implications for the origin of borate deposit

    NASA Astrophysics Data System (ADS)

    Yan, Xue-long; Chen, Bin

    2014-11-01

    The Houxianyu borate deposit in northeastern China is one of the largest boron sources of China, hosted mainly in the Paleoproterozoic meta-volcanic and sedimentary rocks (known as the Liaohe Group) that are characterized by high boron concentrations. The borate ore-body has intimate spatial relationship with the Mg-rich carbonates/silicates of the Group, with fine-grained gneisses (meta-felsic volcanic rocks) as main country rocks. The presence of abundant tourmalinites and tourmaline-rich quartz veins in the borate orebody provides an opportunity to study the origin of boron, the nature of ore-forming fluids, and possible mineralization mechanism. We report the chemical and boron isotopic compositions of tourmalines from the tourmaline-rich rocks in the borate deposit and from the tourmaline-bearing fine-grained gneisses. Tourmalines from the fine-grained gneisses are chemically homogeneous, showing relatively high Fe and Na and low Mg, with δ11B values in a narrow range from +1.22‰ to +2.63‰. Tourmalines from the tourmaline-rich rocks, however, commonly show compositional zoning, with an irregular detrital core and a euhedral overgrowth, and have significantly higher Mg, REE (and more pronounced positive Eu anomalies), V (229-1852 ppm) and Sr (208-1191 ppm) than those from the fine-grained gneisses. They show varied B isotope values ranging from +4.51‰ to +12.43‰, which plot intermediate between those of the terrigenous sediments and arc rocks with low boron isotope values (as represented by the δ11B = +1.22‰ to +2.63‰ of the fine-grained gneisses of this study) and those of marine carbonates and evaporates with high boron isotope values. In addition, the rim of the zoned tourmaline shows notably higher Mg, Ti, V, Sn, and Pb, and REE (particularly LREEs), but lower Fe, Co, Cr, Ni, Zn, Mn, and lower δ11B values than the core. These data suggest that (1) the sources of boron of the borate ore-body are mainly the Paleoproterozoic meta-volcanic and

  9. Discontinuum Modelling Approach for Stress Analysis at a Seismic Source: Case Study

    NASA Astrophysics Data System (ADS)

    Sainoki, Atsushi; Mitri, Hani S.; Yao, Mike; Chinnasane, Damodara

    2016-12-01

    Rockbursts in underground mines can cause devastating damage to mine workings; hence, it is important to be able to assess the potential for their occurrence. The present study focuses on a large seismic event that took place at an underground base metal mine in Canada. The event took place in a dyke near the 100/900 orebodies on 3880 Level (1180 m below surface) of the Copper Cliff Mine in Sudbury, Canada. A 3D continuum stress analysis of the orebodies, i.e., 100 and 900, using an orebody-wide model encompassing the major geological structures and in situ stress heterogeneity in the mine shows low potential for rockburst at the seismic source location—a result which contradicts the fact that a large seismic event actually took place. A postulation is thus made that there had been highly stressed regions caused by geological disturbances at the source location before mining activities took place. In order to verify the postulation, a further study is undertaken with the discrete element modelling technique, whereby a cube-shaped model containing a fracture network is subjected to a stress state similar to that at the source location. A model parametrical study is conducted with respect to the distribution of the fracture (joint) network and its mechanical properties. The results reveal that when joints are densely distributed at the source location, the stress state becomes significantly burst prone. It is observed that the length, density, stiffness, and orientation of joints have a large influence on the stress state along the joints, while the friction angle, cohesion, and tensile strength do not influence the stress state. A cube-shaped model is constructed with joint sets actually mapped at the mine and a stress analysis is performed. The results demonstrate the generation of highly stressed regions due to the interaction of the joints with the applied in situ stress fields, thus leading to burst-prone conditions. The present study numerically confirms that

  10. Diagnosis of environmental problems related to vein gold mining in Colombia

    NASA Astrophysics Data System (ADS)

    Prieto, Gloria R.; Gonzalez, Myriam L.

    Since 1985 the annual gold production in Colombia has been fluctuating between 30 and 35 tons (1-1.4 million ounces troy). Exploitation plants can be found in vein and placer gold deposits. During 1992 a preliminary study was undertaken, resulting in a diagnosis of problems in small scale mining in 6 gold areas (vein type) of Colombia. In order to evaluate the general impact caused to the environment due to mining activities, six gold districts located in Nariño, Antioquia, Bolivar, Valle and Caldas Departments were visited. Geochemical analysis (ES, AAS, HGAAS, GFAAS) of orebodies, tailings and waters were carried out, with results that showed high levels of heavy metals in the environmental compartments studied.

  11. Geologic controls of uranium mineralization in the Tallahassee Creek uranium district, Fremont County, Colorado.

    USGS Publications Warehouse

    Dickinson, K.A.

    1981-01-01

    Two important orebodies have been defined by drilling in the Tallahassee Creek uranium district, Fremont County, Colorado, namely the Hansen and the Picnic Tree. Host rocks are respectively the upper Eocene Echo park Alluvium, and the lower Oligocene Tallahassee Creek Conglomerate. Average ore grade is about 0.08% U3O8. The principal source rock is the lower Oligocene Wall Mountain Tuff. Leaching and transportation of the uranium occurred in alkaline oxidizing ground water that developed during alteration of the ash in a semi-arid environment. The uranium was transported in the groundwater and deposited in a reducing environment controlled by carbonaceous material and associated pyrite. Localization of the ore was controlled by groundwater flow conditions and by the distribution of organic matter in the host rock. -from Author

  12. The Relief Canyon gold deposit, Nevada: a mineralized solution breccia

    USGS Publications Warehouse

    Wallace, A.R.

    1989-01-01

    The Relief Canyon gold deposit in the Humboldt Range of western Nevada is a low-grade, high-tonnage orebody of Tertiary or younger age. The host rocks include limestones of the Triassic Cane Spring Formation, which are overlain by shales of the Triassic Grass Valley Formation. Gold, fluorite, pyrite, silver, calcite, and fine-grained silica are the principal hydrothermal minerals in the deposit. The deposit formed at a relatively shallow depth. On the basis of fluid inclusion data, late-stage hydrothermal fluids related to gold and fluorite deposition were extremely dilute and had temperatures near 200??C. The fluid inclusions in fluorite show no evidence for boiling, but porous crackle breccias in the jasperoids suggest that hydrobrecciation took place. -from Author

  13. Sulphur isotope geochemistry of the ores and country rocks at the Almadén mercury deposit, Ciudad Real, Spain

    NASA Astrophysics Data System (ADS)

    Saupé, Francis; Arnold, Michel

    1992-10-01

    Seventy-four new S isotope analyses of ore minerals and country rocks are given for the Hg deposit of Almadén. The spread of the cinnabar δ34S is narrow within each of the three orebodies, but the δ34S average values differ sufficiently between them (mean δ34S: San Nicolas = 0.2 ± 1.1 %., San Francisco = 8.1 ± 0.7%., San Pedro = 5.9 ± 1.0%.) to indicate three different mineralization episodes and possibly processes. The unweighted mean for all cinnabar samples is 5.6%. and the S source is considered to be the host-rocks, either the Footwall Shales ( δ34S = 5.5%.) or the spilites ( δ34 S = 5.1 ± 1.3%.). For geometric and chronologic reasons, the former seem the best potential source. However, the high δ34 S values of the San Francisco cinnabar cannot be explained without addition of heavy S from reduction of seawater sulphate. Orderly distributions of the δ34S values are observed in all three orebodies: (1) their increase from the stratigraphic bottom to the top in the San Pedro orebody is explained by a Rayleigh process, and (2) the maxima in the centres of the San Francisco and San Nicolas orebodies are explained by mixing of the S transporting hydrothermal fluids with seawater within the sediments. Associated pyrite and cinnabar were deposited under isotopic disequilibrium, probably because the low solubility of cinnabar caused rapid precipitation of cinnabar. The different morphological pyrite types have their own isotopic δ34S signatures. The spilites are notably enriched in S ( n = 3; average S content = 0.56%) compared to normal basalts (1000 ppm) and have an average δ34S = 5.1 ± 1.3%.. The linear relationship between the δ34S and the S content of the spilites is interpreted as a mixing line between mantle S and a constant S source, probably an infinite open reservoir. An incomplete basalt-seawater reaction at nearly constant temperature is the best explanation for this relation. The S (predominantly pyrite) of the black shales ( n = 3; δ34S

  14. Formation of iron-rich shelled structures by microbial communities

    NASA Astrophysics Data System (ADS)

    Fernández-Remolar, David C.; Santamaría, Joan; Amils, Ricardo; Parro, Victor; Gómez-Ortíz, D.; Izawa, Matthew R. M.; Banerjee, Neil R.; Pérez Rodríguez, Raúl; Rodríguez, Nuria; López-Martínez, Nieves

    2015-01-01

    this paper, we describe the discovery and characterization of shelled structures that occur inside galleries of Pyrenees mines. The structures are formed by the mineralization of iron and zinc oxides, dominantly franklinite (ZnFe2O4) and poorly ordered goethite (α-FeO(OH)). Subsurface oxidation and hydration of polymetallic sulfide orebodies produce solutions rich in dissolved metal cations including Fe2+/3+ and Zn2+. The microbially precipitated shell-like structure grows by lateral or vertical stacking of thin laminae of iron oxide particles which are accreted mostly by fungal filaments. The resulting structures are composed of randomly oriented aggregates of needle-like, uniform-sized crystals, suggesting some biological control in the structure formation. Such structures are formed by the integration of two separated shells, following a complex process driven likely by different strategies of fungal microorganisms that produced the complex macrostructure.

  15. Plavica epithermal Au-Ag-Cu deposit in eastern Macedonia: Geology and 3D model of valuable component distribution in ore

    NASA Astrophysics Data System (ADS)

    Serafimovski, T.; Volkov, A. V.; Serafimovski, D.; Tasev, G.; Ivanovski, I.; Murashov, K. Yu.

    2017-07-01

    The Plavica Au-Ag-Cu deposit is related to the large Neogene volcanic center, which complicates the paleocaldera in the central Kratovo-Zletovo ore district of eastern Macedonia. Based on the geology, ore mineralogy, wall-rock alteration, and fluid inclusions, the Plavica deposit has been referred to the epithermal high-sulfidation type. The general 3D model of orebody at this deposit is based on its general geological structure and complex distribution of metal contents. The framework of the 3D model, which has been constructed in the ArcGIS System, comprises 195 exploration boreholes 47295.8 m in total length. The 3D model allows to a better understanding of distribution of mineralization and supplements the geological data on the deposit.

  16. Geologic studies in the Sierra de Pena Blanca, Chihuahua, Mexico

    NASA Astrophysics Data System (ADS)

    Reyes-Cortes, Ignacio Alfonso

    grade of the rock units; and the possible paths of potential leachate through the geologic media. The last part of the work relates to the natural analog of the Yucca Mountain, the Nopal I orebody, which is compared and found similar in its geologic frame work, in the lithologic units and their weathering, in the stratigraphic relationships with the vitrophyres and tuff horizons, in the climatic dryness, in the regional water table depth and the hydrologic features, in the ignimbritic units mineralogy, and in the radioactive waste fuel compared to the ore mineralogy of the Nopal I. There are mineralogic determinations of the fracture fill material in the orebody and host rock; detailed mapping of the fractures and surface alterations; and gamma ray grid measurements and electromagnetic soundings. All these studies indicate a support criteria to take the Nopal I as a natural analogue of the Yucca Mountain repository. The total evolution of the Nopal I orebody is exposed in the walls and floors of the +00 and +10 levels, which are ready to perform final safety tests in order to compare it with the future Yucca Mountain repository behavior. The Nopal in orebody has been there for several hundred of thousands and may be millions of years in an natural equilibrium with the surrounding environment. (Abstract shortened by UMI.)

  17. Localization of mineralization, its age, and relationship to magmatism at the Mogot silver-base-metal deposit, North Stanovoi metallogenic zone in the southeastern framework of the North Asian Craton

    NASA Astrophysics Data System (ADS)

    Buchko, I. V.; Buchko, Ir. V.; Sorokin, A. A.; Ponomarchuk, V. A.; Travin, A. V.

    2014-03-01

    The results of studying the Mogot silver-base-metal deposit located in the Dzhugdzhur-Stanovoi Superterrane are discussed in this paper. The main ore-controlling structural elements of the studied district are near-latitudinal and NE-trending faults, which are accompanied by zones of hydrothermal metasomatic potassic, propylitic, and argillic alterations, breccias with quartz and quartz-carbonate cement replacing metamorphic rocks and granitoids of the Late Stanovoi Complex. The total sulfide content in ore is 2-3%. The high Ag, Pb, and Zn contents in ore allow us to consider the Mogot deposit as silver-base-metal, since except of orebody 4, there are no silver minerals proper. This indicates that silver is incorporated into crystalline lattice of sulfides. The results of 40Ar/39Ar geochronological investigations show that the hydrothermal ore deposition dated at 127-125 Ma was related to emplacement of intrusions pertaining to the Tynda-Bakaran Complex.

  18. Origin of coffinite in sedimentary rocks by a sequential adsorption-reduction mechanism.

    USGS Publications Warehouse

    Goldhaber, M.B.; Hemingway, B.S.; Mohagheghi, A.; Reynolds, R.L.; Northrop, H.R.

    1987-01-01

    Coffinite is the dominant ore mineral in the V-U ores of the Tony-M mine in the Henry Mts mineral belt of the Colorado Plateau. This orebody was formed at a density-stratified solution interface between uranyl-ion-bearing meteoric water and a saline fluid which was locally reducing. The localization of U at this solution interface occurred by adsorption onto the surfaces of detrital minerals, this adsorption being related to the pH difference between the two fluids. Experimental evidence is presented showing that the adsorption facilitated the reduction of uranium to U(IV). This adsorbed, reduced uranium bonded with aqueous silica in the ore zone to form coffinite. The high concentration of silica (as a monomeric species) in the ore-forming solution stabilized coffinite in preference to uraninite.-R.A.H.

  19. Genesis and prospecting perspective of Xianglushan iron deposit, Sichuan Province, China

    NASA Astrophysics Data System (ADS)

    Wang, Tianguo; Liu, Jishun; Huang, Chaowen

    2017-03-01

    More than 30 ore bodies have currently been discovered in the Xianglushan iron deposit in the central part of the Huili-Dongchuan Aulacogen. The main orebody is stratiform or stratoid within the volcanic sedimentary metamorphic rock of the Paleo-Mesoproterozoic Yinmin formation. Minor ores intrude as veins in the country rock and the mineral components of the iron ore are mainly magnetite and hematite. The ore evolved through the Paleo- Mesoproterozoic submarine volcanic eruption deposition period and the Neoproterozoic iron slurry superimposed transformation, and is identified as a sedimentation-transformation-type deposit. A study is conducted on the regional metallogenic background and geological characteristics of the ore deposit; results show that the ore-forming setting of the Xianglushan iron ore is excellent and that the potential of finding large-scale rich iron deposit is considerable.

  20. Uranium ore rolls in Westwater Canyon sandstone, San Juan Basin, New Mexico

    SciTech Connect

    Clark, D.S.

    1980-01-01

    Recent relatively deep uranium-exploration drilling in the Nose Rock area, San Juan Basin, McKinley County, New Mexico, has resulted in the discovery of previously unrecognized uranium ore rolls in gray, unoxidized Westwater Canyon Sandstone of the Morrison Formation. Both the Nose Rock ores and the primary Ambrosia Lake uranium ores were emplaced during the Late Jurassic-Early Cretaceous erosional interval under the same geologic conditions by the same geochemical-cell process. The red, altered interior ground resulting from the geochemical-cell process has been re-reduced by the subsequent entry of reductants into the formation. The original roll form of the Ambrosia Lake orebodies has been obscured and modified by redistribution related to the present-day active redox interface interweaving with the Ambrosia Lake ores.

  1. Epigenetic lead, zinc, silver, antimony, tin, and gold veins in Boulder Basin, Blaine and Custer counties, Idaho; potential for economic tin mineralization

    USGS Publications Warehouse

    Ratchford, Michael E.

    2002-01-01

    Boulder Basin is in a northwest-trending belt of allochthonous Paleozoic rocks in the Boulder Mountains of central Idaho. Regional Tertiary extension resulted in widespread normal faulting and coeval emplacement of shallow-level intrusions and extrusive rocks of the Challis Volcanic Group. Epigenetic lead-zinc-silver-antimony-tin-gold vein deposits formed during Tertiary extension and are hosted within Paleozoic strata. The major orebodies are in the lower plate of the Boulder Basin thrust fault, in massive quartzite of the Middle Pennsylvanian to Lower Permian Wood River Formation. Anomalous concentrations of tin are present in the base-metal mineral assemblage of the Boulder Basin ore deposits. The tin-bearing veins in Boulder Basin are strikingly similar to Bolivian tin deposits. The deposit model for Bolivian tin deposits identifies buried tin porphyry below the tin-bearing vein system.

  2. Fluid dynamics, particulate segregation, chemical processes, and natural ore analog discussions that relate to the potential for criticality in Hanford tanks

    SciTech Connect

    Barney, G.S.

    1996-09-27

    This report presents an in-depth review of the potential for nuclear criticality to occur in Hanford defense waste tanks during past, current and future safe storage and maintenance operations. The report also briefly discusses the potential impacts of proposed retrieval activities, although retrieval was not a main focus of scope. After thorough review of fluid dynamic aspects that focus on particle segregation, chemical aspects that focus on solubility and adsorption processes that might concentrate plutonium and/or separate plutonium from the neutron absorbers in the tank waste, and ore-body formation and mining operations, the interdisciplinary team has come to the conclusion that there is negligible risk of nuclear critically under existing storage conditions in Hanford site underground waste storage tanks. Further, for the accident scenarios considered an accidental criticality is incredible.

  3. Lithostratigraphic position and petrographic characteristics of R.A.T. (“Roches Argilo-Talqueuses”) Subgroup, Neoproterozoic Katangan Belt (Congo)

    NASA Astrophysics Data System (ADS)

    Cailteux, J. L. H.; Kampunzu, A. B. H.; Batumike, M. J.

    2005-07-01

    The Neoproterozoic Katangan R.A.T. ("Roches Argilo-Talqueuses") Subgroup is a sedimentary sequence composed of red massive to irregularly bedded terrigenous-dolomitic rocks occurring at the base of the Katangan succession in Congo. Red R.A.T. is rarely exposed in a continuous section because it was affected by a major layer-parallel décollement during the Lufilian thrusting. However, in a number of thrust sheets, Red R.A.T. is in conformable sedimentary contact with Grey R.A.T which forms the base of the Mines Subgroup. Apart from the colour difference reflecting distinct depositional redox conditions, lithological, petrographical and geochemical features of Red and Grey R.A.T. are similar. A continuous sedimentary transition between these two lithological units is shown by the occurrence of variegated to yellowish R.A.T. The D. Strat. "Dolomies Stratifiées" formation of the Mines Subgroup conformably overlies the Grey R.A.T. In addition, a transitional gradation between Grey R.A.T. and D. Strat. occurs in most Cu-Co mines in Katanga and is marked by interbedding of Grey R.A.T.-type and D. Strat.-type layers or by a progressive petrographic and lithologic transition from R.A.T. to D. Strat. Thus, there is an unquestionable sedimentary transition between Grey R.A.T. and D. Strat. and between Grey R.A.T. and Red R.A.T. The R.A.T. Subgroup stratigraphically underlies the Mines Subgroup and therefore R.A.T. cannot be comprised of syn-orogenic sediments deposited upon the Kundelungu (formerly "Upper Kundelungu") Group as suggested by Wendorff (2000). As a consequence, the Grey R.A.T. Cu-Co mineralisation definitely is part of the Mines Subgroup Lower Orebody, and does not represent a distinct generation of stratiform Cu-Co sulphide mineralisation younger than the Roan orebodies.

  4. Constraining the origin of the Mesozoic Xishimen skarn iron deposit in North China using geochemistry of magnetite

    NASA Astrophysics Data System (ADS)

    SU, S.; Cui, Y.

    2016-12-01

    The Xishimen (XSM) iron deposit in the southern part of the Taihang Mountain, Hebei province, is one of the largest known skarn iron deposits in China. Understanding the origin of the skarn iron deposit has important implications to the lithospheric thinning in the North China Craton during the Mesozoic. The deposit is composed of orebodies along the contact between the Ordovician carbonates and dioritic pluton. There are also veinlets intruding diorites and carbonates. Most iron ores occur net-textured or massive texture. Some iron ores have many vesicles. Magnetite has variable Ti contents between different mineral assemblages. Magnetite coexisted with diopside, tremolite and phlogopite shows high Ti contents, while that coexisted with calcite, talc and pyrite has high SiO2, Hf and Nb, and low Ti. Settlement environment of magnetite ores and/or their location in the metallogenic conduit constrain the textures of ores, mineral assemblages and the content of magnetite. The δ56Fe values of magnetite ores range from -0.015 ‰ to 0.115 ‰, with an average of 0.064 ‰. Fe isotopes of ores are related to the altitude of ores. The heavy Fe isotope tends to be enriched in the lower part of the orebodies, and depleted in the upper part. We infer that the Fe of the deposit may have been derived from high temperature "iron magma". "iron magma" may contain abundant volatiles, such as CO2, P, and H2O. We propose that the XSM iron deposit is most likely formed from "iron magma". Because of fluid overpressure, "iron magma" may have risen along the magmatic conduit. Different magnetite in different parts of the conduit is likely due to the changes of T, P, and oxygen fugacity. Iron isotope fractionation occurs when iron magma rises.

  5. [Study on Mineralogical Characteristics of Quartz and Calcite from Feieling Skarn-Type Pb-Zn Deposit in Southwest Margin of Yunkai Massif].

    PubMed

    Zeng, Chang-yu; Zhao, Ming-zhen; Li, Hong-zhong; Niu, Jia; Zhang, Jie-tang; He, Jun-guo; Zhou, Yong-zhang; Yang, Zhi-jun

    2015-09-01

    The Feieling Pb-Zn deposit of skarn-type is located the in Southwest margin of Yunkai massif, China. This ore deposit can be divided into wall rock near ore, concealed rock mass, endoskarn, exoskarn and orebody. The Raman and FTIR spectrum are conducted to study the mineralogical characteristics of quartz and calcite from five types of rocks from Feieling skarn-type deposit. The analysis shows that the quartz included in the near ore wall rock, endoskarn and exoskarn, comparing with recrystallized quartz of concealed rock mass, has a tend to change into low symmetry quartz in varying degrees. The crystalinity and order degree of quartz from near ore wall rock to concealed rock mass and to endoskarn are becoming higher, but that of quartz from different exoskarn samples display no regular. The origin or the quartz microstructure changes may be related to the multi-stage evolution of skarn mineralization process. The quartz, included in near ore wall rock, endoskarn and exoskarn, become easier to recrystallize and adjust microstructure under the influence of the multi-stage hydrothermal and temperature effect. In anyone sample, the earlier crystalline calcite, showing subhedral-euhedral crystal, display higher crystalinity and order degree. On the contrary, the later crystalline calcite, showing xenomorphic crystal, display lower crystalinity and order degree. Calcite crystal of exoskarn rock contains some silica impurity, while endoskarn and orebody rock is pure. The purity of calcite crystal may relate to Multi-stage evolution of skarn mineralization process. At the early and late skarn stage, active silica-containing fluid is easier to join into calcite, which is under higher temperature environments. On the contrary, at the late quartz-surfide stage, the later crystalized calcite displays higher purity, which is under lower temperature environments. Therefore, spectral characteristics of quartz and calcite reflect multi-stage evolution of skarn mineralization

  6. Bioaccessibility of lead in urban soil of Broken Hill, Australia: A study based on in vitro digestion and the IEUBK model.

    PubMed

    Yang, Kai; Cattle, Stephen R

    2015-12-15

    This study was conducted to investigate lead (Pb) bioaccessibility in urban soil and to assess health risk to children in the city of Broken Hill, Australia, which was established around one of the world's largest lead-zinc-silver mines. Fifty-three topsoil (0-0.1m) and 50 subsoil (0.3-0.5m) samples were collected from earthen footpaths, nature strips, parks or vacant land throughout the urban area. The soil samples were analysed for total Pb concentration, Pb bioaccessibility and Pb mineral phases, together with important soil physicochemical properties known to influence Pb bioaccessibility. Lead bioaccessibility ranged from 24% to 89% in topsoil and from 16% to 100% in subsoil, exhibiting a generally decreasing pattern with increasing distance from the orebody. Lead bioaccessibility was strongly positively related to total Pb concentration in both the topsoil and subsoil. In subsoil, a moderate negative correlation existed between Pb bioaccessibility and soil pH, while a moderate positive correlation existed between Pb bioaccessibility and soil organic matter (OM) content. In contrast, only a weak positive correlation existed between Pb bioaccessibility and OM content in topsoil. The presence of different Pb mineral phases also appeared to have caused variation in soil Pb bioaccessibility, with galena (PbS)-rich samples tending to exhibit lower Pb bioaccessibility. The prediction of blood lead (PbB) levels in Broken Hill children aged 1-4years using the IEUBK model well matched the measured data from a recent PbB screening, suggesting a high risk of childhood chronic low-level Pb exposure (PbB levels >5μg/dL) in Broken Hill, especially in the vicinity of the orebody. Future Pb abatement programs in Broken Hill should utilise the IEUBK model to establish target soil Pb values in an effort to achieve particular child PbB outcomes.

  7. Geology and recognition of a relict uranium deposit in Sec. 28, T. 14 N. , R. 10 W. , Southwest Ambrosia Lake Area, McKinley County

    SciTech Connect

    Smith, D.A.; Peterson, R.J.

    1980-01-01

    Sandstone uranium deposits in the Morrison Formation (Jurassic) within the Ambrosia Lake district, New Mexico, can be broadly classified into four types, based on their geometry and genesis: primary (trend), redistributed fracture-controlled (stack), redistributed geochemical-cell-controlled, and relict (remnant) deposits. Combinations of these deposits can be found within individual orebodies. Many similarities exist among these types of deposits, suggesting the same mechanisms and controls for the origin of the deposits. Probably the most important distinguishing control is the position of the deposits relative to the furthest advance of a pre-Dakota geochemical cell within the Morrison strata. Redistribution of both uranium and humate material occurred as oxidizing conditions migrated through the fluvial sediments. The migration of the oxidizing ground water was largely controlled by the differences in transmissivity developed within the fluvial facies of the host rock. The Sec. 28 uranium deposit, southwest of the major deposits of the Ambrosia Lake district, is here described as a relict uranium deposit. Preservation of the Sec. 28 relict deposit probably was aided by 1) the relatively insoluble character of intermixed uranium and organic matter, 2) lower ground-water transmissivity associated with a stratigraphic pinch-out of the mineralized upper Westwater Canyon, and 3) the influence a set of bounding faults has exhibited on the ground-water flow pattern since Laramide time. Iron-redox, isopach, and sandstone/mudstone trends observed in the Morrison strata in sec. 28 allow the development of a genetic model for relict orebodies within the Ambrosia Lake district.

  8. Review of Hydraulic Fracturing for Preconditioning in Cave Mining

    NASA Astrophysics Data System (ADS)

    He, Q.; Suorineni, F. T.; Oh, J.

    2016-12-01

    Hydraulic fracturing has been used in cave mining for preconditioning the orebody following its successful application in the oil and gas industries. In this paper, the state of the art of hydraulic fracturing as a preconditioning method in cave mining is presented. Procedures are provided on how to implement prescribed hydraulic fracturing by which effective preconditioning can be realized in any in situ stress condition. Preconditioning is effective in cave mining when an additional fracture set is introduced into the rock mass. Previous studies on cave mining hydraulic fracturing focused on field applications, hydraulic fracture growth measurement and the interaction between hydraulic fractures and natural fractures. The review in this paper reveals that the orientation of the current cave mining hydraulic fractures is dictated by and is perpendicular to the minimum in situ stress orientation. In some geotechnical conditions, these orientation-uncontrollable hydraulic fractures have limited preconditioning efficiency because they do not necessarily result in reduced fragmentation sizes and a blocky orebody through the introduction of an additional fracture set. This implies that if the minimum in situ stress orientation is vertical and favors the creation of horizontal hydraulic fractures, in a rock mass that is already dominated by horizontal joints, no additional fracture set is added to that rock mass to increase its blockiness to enable it cave. Therefore, two approaches that have the potential to create orientation-controllable hydraulic fractures in cave mining with the potential to introduce additional fracture set as desired are proposed to fill this gap. These approaches take advantage of directional hydraulic fracturing and the stress shadow effect, which can re-orientate the hydraulic fracture propagation trajectory against its theoretical predicted direction. Proppants are suggested to be introduced into the cave mining industry to enhance the

  9. Isotope composition of carbon in the carbonates of the Gumbeykan scheelite deposits in the southern Urals

    SciTech Connect

    Korzhinskii, A.F.; Mamchur, G.P.; Yarynych, O.A.

    1980-10-01

    Through investigations of the isotope composition of carbon of various generations and carbonates from marbles, skarns, and nested and vein scheelite orebodies, the probable source of carbon of these carbonates has been established as a mixture of sedimentary carbonates, carbon dioxide with carbonic acid that was formed by oxidation of the organic matter from sedimentary terrane (..delta..C/sup 13/ - 0.05 to -0.62%). In the calcite and dolomite phenocrysts of marble and the coarse-grained dolostone, containing scheelite, the carbon was lighter (..delta..C/sup 13/ from -0.60 to -0.87%). For the dolomite and ankerite from scheelite pockets of the Balkan deposit and quartz veins of the Buranovo, ..delta..C/sup 13/ varied from -0.44 to -0.87%. The lightest carbon found in strontianite (..delta..C/sup 13/ = -1.32%), located near the coating of the organic matter (..delta..C/sup 13/ = -1.26%) in fractures of the quartz vein of the Buranovo deposit. In the section through the orebodies and near-ore diffusion-metasomatic zones of the Balkan deposit, the lessening of carbon in the carbonates was observed, with increasing distance away from the fracture. ..delta..C/sup 13/ in the altered granitoids ranged from -0.44 to -1.03%; while in the diopside-wollastonite hornfels, from -0.89 to 1.13%. The lessening in weight of the carbon is explained by diffusional fractionation of the isotopes caused apparently by the differential movement of volatile mixtures of carbon during ore-forming processes and the formation of their diffusion-metasomatic zones.

  10. A precise 232Th-208Pb chronology of fine-grained monazite: Age of the Bayan Obo REE-Fe-Nb ore deposit, China

    USGS Publications Warehouse

    Wang, Jingyuan; Tatsumoto, M.; Li, X.; Premo, W.R.; Chao, E.C.T.

    1994-01-01

    We have obtained precise Th-Pb internal isochron ages on monazite and bastnaesite for the world's largest known rare earth elements (REE)-Fe-Nb ore deposit, the Bayan Obo of Inner Mongolia, China. The monazite samples, collected from the carbonate-hosted ore zone, contain extremely small amounts of uranium (less than 10 ppm) but up to 0.7% ThO2. Previous estimates of the age of mineralization ranged from 1.8 to 0.255 Ga. Magnetic fractions of monazite and bastnaesite samples (<60-??m size) showed large ranges in 232Th 204Pb values (900-400,000) and provided precise Th-Pb internal isochron ages for paragenetic monazite mineralization ranging from 555 to 398 Ma within a few percent error (0.8% for two samples). These results are the first indication that REE mineralization within the giant Bayan Obo ore deposit occurred over a long period of time. The initial lead isotopic compositions (low 206Pb 204Pb and high 208Pb 204Pb) and large negative ??{lunate}Nd values for Bayan Obo ore minerals indicate that the main source(s) for the ores was the lower crust which was depleted in uranium, but enriched in thorium and light rare earth elements for a long period of time. Zircon from a quartz monzonite, located 50 km south of the ore complex and thought to be related to Caledonian subduction, gave an age of 451 Ma, within the range of monazite ages. Textural relations together with the mineral ages favor an epigenetic rather than a syngenetic origin for the orebodies. REE mineralization started around 555 Ma (disseminated monazite in the West, the Main, and south of the East Orebody), but the main mineralization (banded ores) was related to the Caledonian subduction event ca. 474-400 Ma. ?? 1994.

  11. Adapting coastal structures to a moving relative sea level: Roman Time geoarchaeological evidence from Posillipo promontory (Naples, Italy).

    NASA Astrophysics Data System (ADS)

    Aucelli, Pietro; Cinque, Aldo; Giordano, Francesco; Mattei, Gaia; Pappone, Gerardo; Rizzo, Angela

    2016-04-01

    The Posillipo promontory belongs to the southern periphery the active volcanic complex called Campi Flegrei. Especially the central caldera of CF is well known for offering a rich geoarchaeological record of the vertical ground movements it has been suffering since Roman times; which includes the ruins of Portus Julius (built in 37 BC) presently found between 10 and 5 m bsl and the Middle Ages Lithophaga perforations at about 7m asl on the marble columns of the Serapeo building (Morhange, 2006 and references therein). In order to better constraint the vertical movements suffered by the Posillipo promontory during the last two millennia, we selected three geoarcaeolgical coastal sites (Nisida Roman port, Marechiaro Roman port and Villa Robery) and we studied them by means of both geomorphological observations and geophysical surveys (Side Scan Sonar and Single Beam echo-sounder). Within the submerged Roman port of Nisida, built in the 1st AD, we found two pilae of the ancient pier. The submersion measuring of the well-preserved one provided a palaeo-sea level at 3.1±0.30 m bsl. In the submerged Roman port of Marechiaro, we recognized a still preserved breakwater connected to the tuffaceous sea cliff, and submerged foundations of a 1st century small sea-side villa. Nearby there is also a two-storeyed Roman building (Palazzo degli Spiriti), built in the 1st cent. BC and later restructured to adapt to a phase of subsidence (Gunther 1908). From our submersion measurements, two different paleo-sea levels can be deduced: one for the 1st cent. BC at -4.4 + -0.50 m and another for the 1st cent. AD at -3 + - 0.30 m. Finally, in front of the modern Villa Rosebery the sea bottom shows a sub-horizontal element at -3m to -3.5m bsl, emerged during the 1st BC century. In fact, at least three houses were erected there during said century (Gunther, 1908). As the area was very little elevated, an alignment of pilae was also constructed to protect those houses from the breakers. By

  12. Chemical, geological, and hydrological factors governing radionuclide migration from a formerly used seepage trench: a field study. Environmental Sciences Division publication No. 2202

    SciTech Connect

    Olsen, C.R.; Lowry, P.D.; Lee, S.Y.; Larsen, I.L.; Cutshall, N.H.

    1983-09-01

    A total of 3.2 x 10/sup 7/ L of intermediate-level liquid wastes (ILW) generated from routine Oak Ridge National Laboratory operations, were disposed in Trench 7 between 1962 and 1966. The disposed ILW contained about 10/sup 7/ GBq of fission nuclides (primarily /sup 137/Cs and /sup 90/Sr), activation products (primarily /sup 60/Co), actinides (primarily /sup 232/Th and /sup 238/U decay series nuclides), and transuranics (primarily /sup 241/Pu-/sup 241/Am). Gamma-log profiles of the wells near ILW Trench 7 indicate that the waste liquids seeped along discrete layers parallel to bedding and along the strikes of faults and folds. Although most of the radioactivity has been retained by sorption reactions with the trench fill, soils, and weathered bedrock, groundwater characteristics in the vicinity of ILW Trench 7 are still greatly influenced by the constituents of the waste liquids disposed two decades ago. Radionuclide concentrations in the groundwaters near the north end of ILW Trench 7 undergo seasonal variations, with the lowest activities occurring in fall and winter and the highest activities occurring in the spring and after prolonged rainstorm events. The rise in radioactivity in these wells correlates with a rise in the groundwater level and a concurrent increase in groundwater pH. Although ILW Trench 7 has worked effectively to retain most of the disposed radioactivity, two suspected transport pathways from the trench to a nearby seep area have been identified and both appear to be associated with fault zones. Only the pathway near the north end of the trench appears to be leaching alkalinity and thus affecting the retention capacity for /sup 90/Sr. A groundwater interceptor at the north end of ILW Trench 7 is one possible remedial action to help maintain a dry alkaline environment and ensure the integrity of the trench for nuclide retention.

  13. Earth observations taken from shuttle orbiter Atlantis during STS-84 mission

    NASA Image and Video Library

    1997-05-20

    STS084-712-003 (15-24 May 1997) --- Early morning sun highlights the volcanic features on Onekotan Island which is one of several volcanic islands in the Russian owned Kurile Island chain. Onekotan lies just south of Kamchatka. Two volcanoes are active on the island -- the small island surrounded by a moat-like lake in the south (Tao-Rusyr caldera) last erupted in 1952, and the cone-shaped peak at the north end of the island, Nemo peak, erupted in 1938.

  14. 1. GENERAL VIEW OF OBSERVATION BUNKERS TO THE EAST OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. GENERAL VIEW OF OBSERVATION BUNKERS TO THE EAST OF TEST STAND 1-A: IN FOREGROUND, BUILDING 8769, A TWO WINDOW DESIGN (NOT ON SITE PLAN); IN THE MIDDLE DISTANCE, BUILDING 8768, A ONE WINDOW DESIGN "OBSERVATION AND CAMERA BUILDING NO. 2" ON SITE PLAN; IN THE DISTANCE, AT FAR LEFT, BUILDING 8767, A FOUR WINDOW DESIGN "MASTER OBSERVATION AND CAMERA BUILDING NO. 1" ON SITE PLAN. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Observation Bunkers for Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

  15. 33 CFR 110.126 - Monterey Harbor, Calif.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... latitude 36°36′27.5″ N., longitude 121°53′35.0″ W.; thence to latitude 36°36′32.4″ N., longitude 121°53′31.0″ W., in an easterly direction to latitude 36°36′28.8″ N., 121°53′19.0″ W.; thence south to latitude 36°36′23.1″ N., longitude 121°53′19.0″ W.; thence to the north end of Municipal Wharf No. 1...

  16. 33 CFR 110.126 - Monterey Harbor, Calif.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... latitude 36°36′27.5″ N., longitude 121°53′35.0″ W.; thence to latitude 36°36′32.4″ N., longitude 121°53′31.0″ W., in an easterly direction to latitude 36°36′28.8″ N., 121°53′19.0″ W.; thence south to latitude 36°36′23.1″ N., longitude 121°53′19.0″ W.; thence to the north end of Municipal Wharf No. 1...

  17. 33 CFR 110.126 - Monterey Harbor, Calif.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... latitude 36°36′27.5″ N., longitude 121°53′35.0″ W.; thence to latitude 36°36′32.4″ N., longitude 121°53′31.0″ W., in an easterly direction to latitude 36°36′28.8″ N., 121°53′19.0″ W.; thence south to latitude 36°36′23.1″ N., longitude 121°53′19.0″ W.; thence to the north end of Municipal Wharf No. 1...

  18. 33 CFR 110.126 - Monterey Harbor, Calif.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... latitude 36°36′27.5″ N., longitude 121°53′35.0″ W.; thence to latitude 36°36′32.4″ N., longitude 121°53′31.0″ W., in an easterly direction to latitude 36°36′28.8″ N., 121°53′19.0″ W.; thence south to latitude 36°36′23.1″ N., longitude 121°53′19.0″ W.; thence to the north end of Municipal Wharf No. 1...

  19. 33 CFR 110.126 - Monterey Harbor, Calif.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... latitude 36°36′27.5″ N., longitude 121°53′35.0″ W.; thence to latitude 36°36′32.4″ N., longitude 121°53′31.0″ W., in an easterly direction to latitude 36°36′28.8″ N., 121°53′19.0″ W.; thence south to latitude 36°36′23.1″ N., longitude 121°53′19.0″ W.; thence to the north end of Municipal Wharf No. 1...

  20. The US Navy Coastal Surge and Inundation Prediction System (CSIPS): Making Forecasts Easier

    DTIC Science & Technology

    2013-02-14

    demand or use locally archived files  Time, location checks to avoid mismatches w/model domains Hurricane Ike • September 1 – 15, 2008...Landfall:  September 13 0700 UTC  North end Galveston Island  Strong and large Category 2  Highest water mark 5.3 m (17.5 ft.) NAVD88  3rd...North Galveston Pleasure Pier Garratt (1977) 5.48 17.12 20.26 25.79 15.97 Amorocho and DeVries (1980) 7.12 15.42 17.80 22.56 12.93 Large and Pond

  1. Aerial views of the San Andreas Fault

    USGS Publications Warehouse

    Moore, M.

    1988-01-01

    These aerial photographs of the San Andreas fault were taken in 1965 by Robert E. Wallace of the U.S Geological Survey. The pictures were taken with a Rolliflex camera on 20 format black and white flim; Wallace was aboard a light, fixed-wing aircraft, flying mostly at low altitudes. He photographed the fault from San Francisco near its north end where it enters by the Salton Sea. These images represent only a sampling of the more than 300 images prodcued during this project. All the photographs reside in the U.S Geological Survey Library in Menlo Park, California. 

  2. Map showing sampled radiolarian localities in the western Paleozoic and Triassic belt, Klamath Mountains, California

    USGS Publications Warehouse

    Irwin, William P.; Jones, David L.; Blome, Charles D.

    1982-01-01

    The western Paleozoic and Triassic belt, the largest of several major subdivisions of the Klamath Mountains geologic province, extends 300 km northward from the south end of the province in California to the north end of the province in Oregon (see inset map). The rocks of the belt are mainly sedimentary and volcanic, including tuff, cherty tuff, chert, argillite, limestone, and volcanic flows and breccia. They are of oceanic and island arc facies and are highly disarranged tectonically. The southern part of the belt is subdivided into three tectonostratigraphic terranes --- the North Fork, Hayfork, and Rattlesnake Creek terranes. The central and northern parts of the belt are undevided. 

  3. KSC-2014-4831

    NASA Image and Video Library

    2014-12-15

    CAPE CANAVERAL, Fla. – NASA’s Project Morpheus prototype lander is moved into position at the north end of the Shuttle Landing Facility at Kennedy Space Center in Florida in preparation for free flight test No. 15. During the 97-second test, onboard autonomous landing and hazard avoidance technology sensors, or ALHAT, surveyed the hazard field for safe landing sites, then guided the lander forward and downward to a successful landing. For more information on Morpheus, visit: http://www.morpheuslander.jsc.nasa.gov. Photo credit: NASA/Jim Grossman

  4. KSC-2014-4832

    NASA Image and Video Library

    2014-12-15

    CAPE CANAVERAL, Fla. – Engineers and technicians prepare NASA's Project Morpheus prototype lander for free flight test No. 15 at the north end of the Shuttle Landing Facility at Kennedy Space Center in Florida. During the 97-second test, onboard autonomous landing and hazard avoidance technology sensors, or ALHAT, surveyed the hazard field for safe landing sites, then guided the lander forward and downward to a successful landing. For more information on Morpheus, visit: http://www.morpheuslander.jsc.nasa.gov. Photo credit: NASA/Jim Grossman

  5. Cultural Resources Investigation of the Reservoir Shorelines: Gull Lake, Leech Lake, Pine River and Lake Pokegama. Volume 2. Site Location Data.

    DTIC Science & Technology

    1979-06-01

    affiliation Malmo (Middle Woodland ); Blackduck 4. Location: Sec. 4 Twp. 135N R. 29W Verbal description E NWk north end Upper Gull; just east of bridge over...affiliation Woodland 4. Location: Sec. 25 Twp. 134N R. 30W Verbal description NWk SEk on the southeast arm of the southwest part of Wilson Bay, Gull...mound, village, etc.) mound? burial? 2. Map reference USGS Gull Lake 3. Cultural affiliation Woodland and Historic 4. Location: Sec. 21 Tp. 135N R. 29W

  6. 9. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 PALLADIAN WINDOW AT NORTH END OF CENTRAL HALL. 10. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 CENTRAL VIEW OF DOUBLE PARLORS FROM SOUTHWEST PARLOR TOWARD NORTHWEST PARLOR. 11. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 WALLPAPER IN SOUTHWEST PARLOR. 12. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 FIREPLACE IN SOUTHWEST PARLOR. 13. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 WINDOW IN SOUTHWEST PARLOR. 14. Historic American Buildings Survey, Laurence E. Tilley, Photographer April, 1958 DETAIL OF WALLPAPER AND WOODWORK IN ... - Eliza Ward House, 2 George Street, Providence, Providence County, RI

  7. 2. Overview showing Medical Detachment Barracks on both Ramp No. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. Overview showing Medical Detachment Barracks on both Ramp No. 5 (left buildings) and Ramp No. 6 (right buildings). View is to west from roof of Corridor A. Note that a pedestrian sidewalk separates buildings instead of a street for automobiles. In left foreground is the north end of Building No. 9962-B; followed by the north B-sides of Buildings Nos. 9963, 9964, 9965, 9966, 9967 and 9968 on Ramp No. 5. Large white building in far distance is a barracks on the other side of Wilson Avenue. - Madigan Hospital, Medical Detachment Barracks, Bounded by Wilson & McKinley Avenues & Garfield & Lincoln Streets, Tacoma, Pierce County, WA

  8. Basin F Overburden and Soil Sampling and Analysis Study, Rocky Mountain Arsenal

    DTIC Science & Technology

    1982-05-01

    shape, was created in a nstural depression by constructing a dike around te area. It measured approximately 2,900 feeot across at the north end and...save.a 0o6d weda’her, po:entiali health ’lazar.s co personnel, and coordination with the construction activities on-goin- in the Basin). Four boring sites... construction acitivities .-a-going in the lasin. The final sixteen boring locations are presented in Figure 2. No formal final survey of the completed

  9. HIGHLY POLARIZED COUNTERPART OF THE DOUBLE HELIX NEBULA

    SciTech Connect

    Tsuboi, Masato; Handa, Toshihiro

    2010-08-20

    We identified the double helix nebula (DHN) found by the Spitzer Space Telescopein the Galactic center region as a highly polarized feature at 10 GHz with the Nobeyama 45 m telescope. The DHN is located near the north end of the polarized plumes. The position angles of Faraday rotation corrected B vectors in the DHN are presumably along the twisting IR filaments. The linear polarization degree of the DHN is as large as p = 10%, and reaches p = 15% {+-} 2% at the radio polarization peak of the DHN. This means that the DHN has highly ordered magnetic field with synchrotron-emitting relativistic electrons.

  10. D0 Silicon Upgrade: End Calorimeter Transfer Bridge Modification

    SciTech Connect

    Stredde, H.J.; /Fermilab

    1996-07-10

    During the assembly of major components into the D0 Detector, a transfer bridge was required to move the North-End Calorimeter from the clean room,over the cable bridge and onto the north sidewalk of the assembly hall. This experiment is now at the beginning stages of the next phase, namely the upgrade of this Detector for future physics research. A major piece of this upgrade is the installation of a solenoid magnet into the Central Calorimeter. In order to accomplish this, the South End Calorimeter has to be removed from the detector and the North End Calorimeter must be moved an additional 20-inch from its nominal open position (total 60-inch movement). The South End Calorimeter will be removed from the detector using the equipment designed for its installation. The calorimeter will be staged on the south sidewalk during the installation of the solenoid magnet and the central tracking systems. The North End Calorimeter is moved 60-inch to give more space between calorimeters during magnet, tracker and cable installation work. This movement will allow the calorimeter to remain coupled to the cryo system. However, this movement requires an extension be added to the center beam. This extension will support the rear wheels of the calorimeter and in the case of the end calorimeters, carry the majority of the weight. The extension is to be a modification of the transfer bridge. This modification, basically has T1 steel blocks added to one end and legs to the sidewalk supports at the other. The T1 steel blocks are notched to fit into the center beam porches and are welded to bridge rails. This design is the same as that for the installation bridge (3740.312-ME-273456), including the welds and weld procedures which are identical in both cases. Since load testing is impractical, the critical welds will be non-destructive tested by ultrasonic means. The laboratory, through the FESS Department, has a contract with M.Q.S. Inspection Inc. The results of this testing will be

  11. Application of a mesoscale model with 4DDA to the complex terrain near Tooele, Utah

    SciTech Connect

    Cosdtigan, K.R.; Flicker, D.G.; Lee, J.T.

    1995-05-01

    The Tooele Army Depot South Area is located in the high, broad Rush Valley of North-Central Utah. The valley is approximately 1560 m above sea level and roughly 20 Ion across from East to West and 45 km long from North to South. It is surrounded on three sides by mountain ranges with the Oquirrh Mountains to the East, the Stansbury and Onaqui Mountains to the West, and the Sheep Rock and East Tintic Mountains to the South. These mountain ranges include peaks from about 2400 m to 3350 m MSL. A somewhat shorter barrier (2000 m South Mountain) exists on the North end of the valley and the lowest passes are on the north and east sides. Further to the North lies Tooele Valley and the Great Salt Lake. Another significant lake is in the adjacent valley to the east of Rush Valley and the small Rush Lake is at the North end of Rush Valley. The combination of the topography and the lakes leads to interesting local meteorology affected by slope and valley flows and lake breezes for Atmospheric Circulations) for operational use in this area. The nudging scheme takes advantage of an extensive network of local observations in the valley. At the depot there are seven surface observing stations and a 30 m tower, which collect wind, temperature, and humidity data, and Tooele County has recently installed a network of about 25 additional surface stations throughout Rush and Tooele Valleys and on some of the surrounding higher terrain.

  12. Regional geochemical study of the felsic plutonic rocks in the Nuqrah quadrangle, sheet 25E, Kingdom of Saudi Arabia

    SciTech Connect

    Hall, W.E.; Dellinger, D.; Selner, G.I.

    1985-01-01

    A regional geochemical investigation of the felsic plutonic rocks of the Nuqrah quadrangle, sheet 25 E, Kingdom of Saudi Arabia, in which pan concentrates of 384 wadi samples, and 145 rock samples, were collected, defined two separate and distinct anomalous areas. One area contains Jabal Tuwalah and Jabal Awja, and the other is at the north end of Jabal Safad. Both pan concentrates and the rock samples in the Jabal Tuwalah and Jabal Awja areas contain high concentrations of Be, F, La, Mo, Nb, Pb, Th, U, Sn, Y, and Zr, and the plutons underlying those areas are characterized by high total-count radioactivity. These elements are sited in highly evolved alkalic granites and have not been concentrated into a potentially metalliferous deposit related to a hydrothermal ore system. They may be a potential metal source of the future. Pan-concentration samples collected from wadis draining the north end of Jabal Safad contain anomalous Sn, Mo, Pb, and La. Four samples contain 250 to 1000 ppM of tin. The tin anomaly is associated with a small aplitic pluton intrusive into the Jabal Safad alkalic granite complex. A brief reconnaissance of the area did not reveal any greisen or cassiterite mineralization. However, further exploration work in the area is recommended. 23 refs., 10 figs., 3 tabs.

  13. Lead, arsenic, and polycyclic aromatic hydrocarbons in soil and house dust in the communities surrounding the Sydney, Nova Scotia, tar ponds.

    PubMed Central

    Lambert, Timothy W; Lane, Stephanie

    2004-01-01

    This study evaluated lead, arsenic, and polycyclic aromatic hydrocarbon (PAH) contamination in the residential communities adjacent to the Sydney, Nova Scotia, tar ponds, the area considered Canada's worst contaminated site. The tar pond remediation policy has been limited to the site and some residential properties. We compared background concentrations in 91 soil samples taken 5-20 km from the coke oven site with those in soil samples from the three communities surrounding the tar ponds: Whitney Pier, Ashby, and North End. These surrounding communities were statistically different from background regarding arsenic, lead, and PAHs. Twenty percent of the background soil samples and 95% of the tar pond soil samples were above the Canadian health-risk-based soil guidelines for arsenic (12 ppm), and 5% of the background samples and 80% of the tar pond soil samples were above the Canadian guidelines for lead (140 ppm). Regarding dust lead and arsenic loading, the results provide no evidence that Whitney Pier is significantly different than Ashby and North End. Children in these communities are predicted to have a 1-15% chance of blood lead > 10 microg/dL. The results suggest that lead and arsenic found in the homes originate outside. The lead content of paint in the homes was not evaluated, but consideration of painted wood at the doorway did not confound the results of the study. The results indicate that the residential environment has been adversely affected by PAHs, lead, and arsenic and should be considered for remediation. PMID:14698928

  14. Analytical results, geology, and sample locality map of mercury-sulfur-gypsum mineralization at Crater, Inyo County, California

    USGS Publications Warehouse

    Erickson, M.S.; Marsh, S.P.; Roemer, T.A.

    1984-01-01

    The Crater mercury-su l fur-gypsum ~ineral ized area is located in east-central California along the crest of the Last Chance Range, west of the north end of Death Valley (fig. 1). The area is in the northwest quarter of the Last Chance Range 15-minute quadrangle and occupies the area between 117 39 and 117 45 longitude and 37 10 and 37 15 latitudP.. The area studied lies between 5000 ( 1525 m) and 6000 ( 1830 m) feet above sea level. Relief isgenerally moderate but can be extreme in some places, as at Hanging Rock Canyon (plate 1). The climate is arid, and there are no active streams in the area. The range fronts east and west of the area are precipitous and incised by many steep canyons, whereas the range crest has relatively low relief. The old abandoned town and mine site of Crater 1 ie in this area of low relief. Access to the Crater area is by paved and dirt roads from Big Pine to the west or from the north end of the Death Valley National Monument to the southeast.

  15. Origin of the granites and related Sn and Pb-Zn polymetallic ore deposits in the Pengshan district, Jiangxi Province, South China: constraints from geochronology, geochemistry, mineral chemistry, and Sr-Nd-Hf-Pb-S isotopes

    NASA Astrophysics Data System (ADS)

    Xu, Bin; Jiang, Shao-Yong; Luo, Lan; Zhao, Kui-Dong; Ma, Liang

    2016-05-01

    The Pengshan Sn and Pb-Zn polymetallic deposits are located in the south margin of the Jiujiang-Ruichang (Jiurui) district of the Middle-Lower Yangtze River Metallogenic Belt in South China. Four large deposits include Huangjinwa, Zengjialong, Jianfengpo, and Zhangshiba, the former three are Sn-dominant deposits which occur as stratiform orebodies in the contact zones of the Pengshan granites and within the country rock strata, whereas Zhangshiba consists of stratiform Pb-Zn orebodies within the Precambrian metasedimentary strata. In this study, we present results on zircon U-Pb ages, major and trace elements, and mineral chemistry as well as Sr-Nd-Hf isotope data of the granites, Pb and S isotopes of both the Sn-dominant and Pb-Zn dominant deposits, and U-Pb dating of cassiterite from the Pengshan district. SHRIMP and LA-ICP-MS zircon U-Pb dating shows that the Pengshan granites were emplaced in the Early Cretaceous (129-128 Ma), which is in good agreement with the U-Pb dating (130-128 Ma) of cassiterite from the Jianfengpo Sn deposit. The Pengshan granites consist mainly of weakly peraluminous highly fractionated I-type affinity granitic rocks. Detailed elemental and isotopic data suggest that the granites formed by partial melting of Mesoproterozoic metamorphic basement materials with minor input of mantle-derived melts. The mineral chemistry of biotite demonstrates that the Pengshan granitic magma had a low oxygen fugacity, thereby precluding the tin dominantly partitioning into the rock-forming silicate minerals and favoring accumulation in the exsolved residual liquid during magma crystallization stages. Sulfur isotopes show a relatively heavy sulfur isotopic composition from 5.8 to 17.6 ‰, and no difference for sulfur isotopes between the Sn deposits (5.8-13.4 ‰, Huangjinwa, Zengjialong, Jianfengpo) and the Pb-Zn deposit (mostly 7.1-13.0 ‰, except for one 17.6 ‰, Zhangshiba). The sulfur isotope data of pyrite from the host sedimentary rocks show

  16. Behavior of iron-group elements, oxybarometry, and genesis of unique chromite deposits in the Kempirsai massif

    NASA Astrophysics Data System (ADS)

    Chashchukhin, I. S.; Votyakov, S. L.

    2009-04-01

    Ultramafic rocks and high-Cr chromite ore from the Almaz-Zhemchuzhina deposit, the largest in the Main ore field of the Kempirsai massif, have been studied. The detailed mineralogical and geochemical examination of deep structure test and exploratory boreholes allowed us to establish the rough stratification of ultramafic rocks and to demonstrate the position of unique chromite deposits in the generalized vertical section of the southeastern Kempirsai massif. From top to bottom, a barren harzburgite-lherzolite series gives way to an ore-bearing dunite-harzburgite complex with the largest chromite deposits, including the unique Almaz-Zhemchuzhina deposit, in its upper portion and then to pyroxene-free dunite densely impregnated with chromite in the upper part and containing sparsely disseminated chromite at its base. The lower unit is composed of a barren lherzolite-harzburgite series transformed into blastomylonites near the contact with dunite, suggesting a tectonically doubled section in the southeastern part of the massif. The synore asymmetric geochemical zoning developed in the course of formation of chromite deposits as a result of removal of oreforming iron-group elements from the underlying and wall ultramafic rocks into the overlying rocks. Host rocks with disturbed initial proportions of Cr, Fe, Ni, and Mn, together with orebodies, made up ore-bearing zones no less than 1 km in thickness and subdivided into supra-, inter-, and subore subzones. The subore and wall rocks are characterized by partial loss (wt %) of Cr2O3(0.1), NiO (0.04), FeOtot(0.5), and MnO (0.02) and their removal into the interore and supraore (0.03 NiO) subzones. Thus, the subore ultramafic rocks served as a source of ore-forming components, while the interore zone with orebodies occurring therein served as a zone of discharge of these components. Using Mössbauer spectroscopy, the crystal chemistry of iron ions was studied in a representative selection of Cr-spinel samples from rocks

  17. Diamonds in ophiolitic mantle rocks and podiform chromitites: An unsolved mystery

    NASA Astrophysics Data System (ADS)

    Yang, J.; Zhang, Z.; Xu, X.; Ba, D.; Bai, W.; Fabg, Q.; Meng, F.; Chen, S.; Robinson, P. T.; Dobrzhinetskaya, L.

    2009-05-01

    In recent years ultrahigh pressure minerals, such as diamond and coesite, and other unusual minerals were discovered in chromitites of the Luobusa ophiolite in Tibet, and 4 new minerals have been approved by the CNMMN. These results have raised many questionsWhat are the occurrences of the diamonds, what is the source of their carbon and how were they formed? What is the origin of the chromites hosting the diamonds and at what depth did they form? What is the genetic relationship between the diamonds and the host chromitites? In what geological, geophysical and geochemical environments can the diamonds be formed and how are they preserved? The UHP minerals from Luobusa are controversial because they have not been found in situ and because ophiolites are currently believed to form at shallow levels above oceanic spreading centers in suprasubduction zone environments. More detailed study and experimental work are needed to understand the origin and significance of these unusual minerals and investigations of other ophiolites are needed to determine if such minerals occur elsewhere To approach these problems, we have collected two one-ton samples of harzburgite hosting chromitite orebodies in the Luobusa ophiolite in Tibet. The harzburgite samples were taken close to chromitite orebody 31, from which the diamonds, coesite and other unusual minerals were recovered. We processed these two samples in the same manner as the chromitites and discovered numerous diamonds and more than 50 other mineral species. These preliminary results show that the minerals in the harzburgites are similar to those in the chromitites, suggesting a genetic relationship between them. To determine if such UHP and unusual minerals occur elsewhere, we collected about 1.5 t of chromitite from two orebodies in an ultramafic body in the Polar Urals. Thus far, more than 60 different mineral species have been separated from these ores. The most exciting discovery is the common occurrence of diamond, a

  18. Origin of the granites and related Sn and Pb-Zn polymetallic ore deposits in the Pengshan district, Jiangxi Province, South China: constraints from geochronology, geochemistry, mineral chemistry, and Sr-Nd-Hf-Pb-S isotopes

    NASA Astrophysics Data System (ADS)

    Xu, Bin; Jiang, Shao-Yong; Luo, Lan; Zhao, Kui-Dong; Ma, Liang

    2017-03-01

    The Pengshan Sn and Pb-Zn polymetallic deposits are located in the south margin of the Jiujiang-Ruichang (Jiurui) district of the Middle-Lower Yangtze River Metallogenic Belt in South China. Four large deposits include Huangjinwa, Zengjialong, Jianfengpo, and Zhangshiba, the former three are Sn-dominant deposits which occur as stratiform orebodies in the contact zones of the Pengshan granites and within the country rock strata, whereas Zhangshiba consists of stratiform Pb-Zn orebodies within the Precambrian metasedimentary strata. In this study, we present results on zircon U-Pb ages, major and trace elements, and mineral chemistry as well as Sr-Nd-Hf isotope data of the granites, Pb and S isotopes of both the Sn-dominant and Pb-Zn dominant deposits, and U-Pb dating of cassiterite from the Pengshan district. SHRIMP and LA-ICP-MS zircon U-Pb dating shows that the Pengshan granites were emplaced in the Early Cretaceous (129-128 Ma), which is in good agreement with the U-Pb dating (130-128 Ma) of cassiterite from the Jianfengpo Sn deposit. The Pengshan granites consist mainly of weakly peraluminous highly fractionated I-type affinity granitic rocks. Detailed elemental and isotopic data suggest that the granites formed by partial melting of Mesoproterozoic metamorphic basement materials with minor input of mantle-derived melts. The mineral chemistry of biotite demonstrates that the Pengshan granitic magma had a low oxygen fugacity, thereby precluding the tin dominantly partitioning into the rock-forming silicate minerals and favoring accumulation in the exsolved residual liquid during magma crystallization stages. Sulfur isotopes show a relatively heavy sulfur isotopic composition from 5.8 to 17.6 ‰, and no difference for sulfur isotopes between the Sn deposits (5.8-13.4 ‰, Huangjinwa, Zengjialong, Jianfengpo) and the Pb-Zn deposit (mostly 7.1-13.0 ‰, except for one 17.6 ‰, Zhangshiba). The sulfur isotope data of pyrite from the host sedimentary rocks show

  19. Geochemistry and jasper beds from the Ordovician Løkken ophiolite, Norway: origin of proximal and distal siliceous exhalites

    USGS Publications Warehouse

    Grenne, Tor; Slack, John F.

    2005-01-01

    Stratiform beds of jasper (hematitic chert), composed essentially of SiO2 (69-95 wt %) and Fe2O3 (3-25 wt %), can be traced several kilometers along strike in the Ordovician L??kken ophiolite, Norway. These siliceous beds are closely associated with volcanogenic massive sulfide (VMS) deposits and are interpreted as sea-floor gels that were deposited by fallout from hydrothermal plumes in silica-rich seawater, in which plume-derived Fe oxyhydroxide particles promoted flocculation and rapid settling of large (???200 ??m) colloidal particles of silica-iron oxyhydroxide. Concentrations of chalcophile elements in the jasper beds are at the parts per million level implying that sulfide particle fallout was insignificant and that the Si-Fe gel-forming plumes were mainly derived from intermediate- (100??-250??C) to high-temperature (>250??) white smoker-type vents with high Fe/S ratios. The interpreted setting is similar to that of the Lau basin, where high-temperature (280??-334??C) white smoker venting alternates or overlaps with sulfide mound-forming black smoker venting. Ratios of Al, Sc, Th, Hf, and REE to iron are very low and show that the detrital input was <0.1 percent of the bulk jasper. Most jasper beds are enriched in U, V, P, and Mo relative to the North American Shale Composite, reflecting a predominantly seawater source, whereas REE distribution patterns (positive Eu and negative Ce anomalies) reflect variable mixing of hydrothermal solutions with oxic seawater at dilution ratios of ???102 to 104. Trace element variations in the gel precursor to the jasper are thought to have been controlled by coprecipitation and/or adsorption by Fe oxyhydroxide particles that formed by the oxidation of hydrothermal Fe2+ within the variably seawater-diluted hydrothermal plume(s). Thick jasper layers near the H??ydal VMS orebody show distinct positive As/Fe and Sb/Fe anomalies that are attributed to near-vent rapid settling of Si-Fe particles derived from As- and Sb

  20. Mineralogy and trace-element geochemistry of the high-grade iron ores of the Águas Claras Mine and comparison with the Capão Xavier and Tamanduá iron ore deposits, Quadrilátero Ferrífero, Brazil

    NASA Astrophysics Data System (ADS)

    Spier, Carlos Alberto; de Oliveira, Sonia Maria Barros; Rosière, Carlos Alberto; Ardisson, José Domingos

    2008-02-01

    Tamanduá orebodies shows that the original composition of the itabiritic protore plays a major role in the genesis of high- and low-grade soft ores in the QF. Under the same weathering and structural conditions, the dolomitic itabirite is the more favorable to form high-grade deposits than siliceous itabirite. Field relations at the Águas Claras and Capão Xavier deposits suggest that it is not possible to form huge soft high-grade supergene deposits from siliceous itabirite, unless another control, such as impermeable barriers, had played an important role. The occurrence in the Tamanduá Mine of a large, soft, high-grade orebody formed from siliceous itabirite and closely associated with hypogene hard ore suggests that large, soft, high-grade orebodies of the Quadrilátero Ferrífero, which occur within siliceous itabirite, have a hypogene contribution in their formation.

  1. Sedimentary carbonate-hosted giant Bayan Obo REE-Fe-Nb ore deposit of Inner Mongolia, China; a cornerstone example for giant polymetallic ore deposits of hydrothermal origin

    USGS Publications Warehouse

    Chao, E.C.T.; Back, J.M.; Minkin, J.A.; Tatsumoto, M.; Junwen, Wang; Conrad, J.E.; McKee, E.H.; Zonglin, Hou; Qingrun, Meng; Shengguang, Huang

    1997-01-01

    Detailed, integrative field and laboratory studies of the textures, structures, chemical characteristics, and isotopically determined ages and signatures of mineralization of the Bayan Obo deposit provided evidence for the origin and characteristics favorable for its formation and parameters necessary for defining giant polymetallic deposits of hydrothermal origin. Bayan Obo is an epigenetic, metasomatic, hydrothermal rare earth element (REE)-Fe-Nb ore deposit that is hosted in the metasedimentary H8 dolostone marble of the Middle Proterozoic Bayan Obo Group. The metasedimentary sequence was deposited on the northern continental slope of the North China craton. The mine area is about 100 km south of the suture marking Caledonian subduction of the Mongolian oceanic plate from the north beneath the North China craton. The mineralogy of the deposit is very complex, consisting of more than 120 different minerals, some of which are epigenetic minerals introduced by hydrothermal solutions, and some of which are primary and secondary metamorphic minerals. The major REE minerals are monazite and bastnaesite, whereas magnetite and hematite are the dominant Fe-ore minerals, and columbite is the most abundant Nb mineral. Dolomite, alkali amphibole, fluorite, barite, aegirine augite, apatite, phlogopite, albite, and microcline are the most widespread gangue minerals. Three general types of ores occur at Bayan Obo: disseminated, banded, and massive ores. Broad zoning of these ore types occurs in the Main and East Orebodies. Disseminated ores are in the outermost zone, banded ores are in the intermediate zone, and massive ores are in the cores of the orebodies. On the basis of field relations, host rocks, textures, structures, and mineral assemblages, many varieties of these three types of ores have been recognized and mapped. Isotopic dating of monazite, bastnaesite, aeschynite, and metamorphic and metasomatic alkali amphiboles associated with the deposit provides constraints

  2. Sulphur isotope constraints on formation conditions of the Luiswishi ore deposit, Democratic Republic of Congo (DRC)

    NASA Astrophysics Data System (ADS)

    Lerouge, C.; Cailteux, J.; Kampunzu, A. B.; Milesi, J. P.; Fléhoc, C.

    2005-07-01

    Luiswishi is a Congo-type Neoproterozoic sediment-hosted stratiform Cu-Co ore deposit of the Central Africa Copperbelt, located northwest of Lubumbashi (DRC). The ores form two main Cu-Co orebodies hosted by the Mines Subgroup, one in the lower part of the Kamoto Formation and the other at the base of the Dolomitic Shales Formation. Sulphides occur essentially as early parallel layers of chalcopyrite and carrolite, and secondarily as late stockwork sulphides cross-cutting the bedding and the early sulphide generation. Both types of stratiform and stockwork chalcopyrite and carrolite were systematically analyzed for sulphur isotopes, along the lithostratigraphic succession of the Mine Series. The quite similar δ 34S values of stratiform sulphides and late stockwork sulphides suggest an in situ recrystallization or a slight remobilization of stockwork sulphides without attainment of isotopic equilibrium between different sulphide phases (chalcopyrite and carrolite). The distribution of δ 34S values (-14.4‰ to +17.5‰) combined with the lithology indicates a strong stratigraphic control of the sulphur isotope signature, supporting bacterial sulphate reduction during early diagenesis of the host sediments, in a shallow marine to lacustrine environment. Petrological features combined with sulphur isotopic data of sulphides at Luiswishi and previous results on nodules of anhydrite in the Mine Series indicate a dominant seawater/lacustrine origin for sulphates, precluding a possible hydrothermal participation. The high positive δ 34S values of sulphides in the lower orebody at Luiswishi, hosted in massive chloritic-dolomitic siltite (known as Grey R.A.T.), fine-grained stratified dolostone (D.Strat.) and silicified-stromatolitic dolomites alternating with chloritic-dolomitic silty beds (R.S.F.), suggest that they were probably deposited during a period of regression in a basin cut off from seawater. The variations of δ 34S values (i.e. the decrease of δ 34S values

  3. Clay alteration and gold deposition in the genesis and blue star deposits, Eureka County, Nevada

    USGS Publications Warehouse

    Drews-Armitage, S. P.; Romberger, S.B.; Whitney, C.G.

    1996-01-01

    The Genesis and Blue Star sedimentary rock-hosted gold deposits occur within the 40-mile-long Carlin trend and are located in Eureka County, Nevada. The deposits are hosted within the Devonian calcareous Popovich Formation, the siliciclastic Rodeo Creek unit and the siliciclastic Vinini Formation. The host rocks have undergone contact metamorphism, decalcification, silicification, argillization, and supergene oxidation. Detailed characterization of the alteration patterns, mineralogy, modes of occurrence, and associated geochemistry of clay minerals resulted in the following classifications: least altered rocks, found distal to the orebody, consisting of both metamorphosed and unmetamorphosed host rock that has not been completely decalcified; and altered rocks, found proximal to the orebody that have been decalcified. Altered rocks are classified further into the following groups based on clay mineral content: silicic, 1 to 10 percent clay; silicicargillic, 10 to 35 percent clay; and argillic, 35 to 80 percent clay. Clay species identified are 1M illite, 2M1 illite, kaolinite, halloysite, and dioctahedral smectite. An early hydrothermal event resulted in the precipitation of euhedral kaolinite and at least one generation of silica. This event occurred contemporaneously with decalcification which increased rock permeability and porosity. A second clay alteration event resulted in the precipitation of hydrothermal 1M illite which replaced hydrothermal kaolinite and is associated with gold deposition. Silver and silica deposition is also associated with this phase of hydrothermal alteration. Hydrothermal alteration was followed by supergene alteration which resulted in the formation of supergene kaolinite, halloysite, and smectite as well as the oxidation of iron-bearing minerals. Supergene clays are concentrated along faults, dike margins, and within rocks containing carbonate. Gold mineralization is not associated with supergene clay minerals within the Genesis and

  4. Coexistence of compositionally heterogeneous chromitites in the Antalya-Isparta ophiolitic suite, SW Turkey: A record of sequential magmatic processes in the sub-arc lithospheric mantle

    NASA Astrophysics Data System (ADS)

    Uysal, Ibrahim; Akmaz, Recep Melih; Saka, Samet; Kapsiotis, Argyrios

    2016-04-01

    The Antalya-Isparta region in southwestern Turkey is well known for its large ophiolitic peridotite exposures, which host various chromite orebodies. These are small-sized, massive to disseminated in texture chromitites occurring in the form of lenses or veinlets, and commonly surrounded by dunite envelopes of variable thickness. Chromitite seams from the Antalya mantle suite are both high- and intermediate-Cr varieties (Cr# = 0.56-0.83), whereas chromitites in the Isparta mantle sequence are exclusively Cr-rich (Cr# = 0.75-0.85). In situ minor and trace element abundances obtained by LA-ICP-MS analyses of unaltered Cr-spinel from the Cr-rich chromitites are comparable to those reported in Cr-spinel of chromitites from typical fore-arc peridotite complexes. However, minor and trace element concentrations in Cr-spinel from intermediate chromitites are dissimilar to those acquired from Cr-spinels of chromitites from well-known back-arc basin-derived ultramafic massifs. Calculation of parental magma compositions indicates that both types of chromitites share a common parentage with progressively fractionating arc-related melts. The studied chromitites are characterized by a systematic enrichment in IPGE [Os, Ir, and Ru (41-317 ppb)] with respect to PPGE [Rh, Pt, and Pd (3-49 ppb)], resulting in negatively-sloping chondrite-normalized PGE patterns that are less fractionated in intermediate chromitites. Their noble mineral assemblage is vastly dominated by tiny (≥ 10 μm) euhedral laurite crystals, followed by subsidiary irarsite and trivial amounts of Os-Ir alloy grains. PGM grains are not encountered in the intermediate chromitites, potentially due to crystallization resulting from PGE-poor melt. Laurite is Os-poor and exhibits a narrow range of Os-for-Ru substitution [Ru/(Ru + Os) = 0.75-0.99]. However, the concomitance of laurite and millerite in the Cr-rich chromitites of the mutual Antalya-Isparta mantle suite is in favour of their precipitation from an Os

  5. Epithermal paleosurfaces

    NASA Astrophysics Data System (ADS)

    Sillitoe, Richard H.

    2015-10-01

    Many active volcanic-hydrothermal and geothermal systems are characterized by distinctive surface and near-surface landforms and products, which are generated during discharge of a spectrum of fluid types under varied conditions. Remnants of most of these products are preserved in some of their less-eroded, extinct equivalents: epithermal deposits of high-sulfidation (HS), intermediate-sulfidation (IS), and low-sulfidation (LS) types. Steam-heated alteration occupying vadose zones and any underlying silicified horizons formed at paleogroundwater tables characterize HS, IS, and LS deposits as do hydrothermal eruption craters and their subaerial or shallow sub-lacustrine breccia aprons and laminated infill. Although rarely recognized, HS, IS, and LS systems can also contain finely laminated, amorphous silica sediments that accumulated in acidic lakes and mud pots and, exclusive to HS systems, in hyperacidic crater lakes. In contrast, silica sinter and more distal carbonate travertine are hot spring discharge products confined mainly to LS and IS settings, as both form from near-neutral-pH liquids. Hydrothermal chert deposition and sediment silicification can take place in shallow, lacustrine rift settings, also largely restricted to LS and IS deposits. These surface and near-surface hydrothermal products are typically metal deficient, although mercury concentrations are relatively commonplace and were formerly exploited in places. Nonetheless, sinters, hydrothermal eruption craters, and silicified lacustrine sediments may contain anomalously high precious metal values; indeed, the last of these locally constitutes low-grade, bulk-tonnage orebodies. The dynamic nature of epithermal paleosurfaces, caused by either syn-hydrothermal aggradation or degradation, can profoundly affect deposit evolution, leading to either eventual burial or telescoping of shallower over deeper alteration ± precious metal mineralization. Formational age, tectonic and climatic regime

  6. Effects of overburden, biomass and atmospheric inversions on energy and angular distributions of gamma rays from U, K, Th, and airborne radon sources. Final report

    SciTech Connect

    Rubin, R.M.; Leggett, D.; Wells, M.B.

    1980-12-01

    This report describes a set of radiation transport calculations that were run with the AHISN S/sub n/ discrete ordinates code and a point kernel code to determine the energy, polar angle and height in air distributions of the total and direct gamma-ray flux densities from: (1) uranium sources of 3.2, 200 and 800 ppM in a sandstone orebody covered with biomass densities of 0, 10.2, 20.4, 51.0 and 102.0 kg/m/sup 2/; (2) thorium sources of 12, 25 and 80 ppM in a sandstone ore body covered with biomass densities of 0, 10.2, 20.4, 51.0 and 102.0 kg/m/sup 2/; (3) potassium source (2.5 wt %) in a sandstone ore body covered with biomass densities of 0, 10.2, 20.4, 51.0 and 102.0 kg/m/sup 2/; (4) constant airborne source with height for no inversion and for inversion layer heights of 65.22, 260.32 and 458.43 m; (5) exponentially decreasing airborne source for no inversion and inversion layer heights of 65.22, 260.32 and 458.43 m; (6) 3.2 ppM uranium source in overburden layers of 10.266, 17.110, 26.399 and 32.509 cm thick; (7) 12 ppM thorium source in overburden layers of 10.266, 17.110, 26.399 and 32.509 cm; (8) 2.5 wt % of potassium in overburden layers of 10.266, 17.110, 26.399 and 32.509 cm thick; and (9) 3.2 ppM, 200 ppM, and 800 ppM uranium source in sandstone orebody covered with overburden thicknesses of 10.266, 17.110, 26.399 and 32.509 cm. Gamma-ray emission from the decay of natural uranium, thorium, radon, and potassium are given in a 45-energy group structure applicable to the energy windows used to map the potential uranium ore reserves.

  7. Geology, mineralization, and geochronology of the Qianhe gold deposit, Xiong'ershan area, southern North China Craton

    NASA Astrophysics Data System (ADS)

    Tang, Ke-Fei; Li, Jian-Wei; Selby, David; Zhou, Mei-Fu; Bi, Shi-Jian; Deng, Xiao-Dong

    2013-08-01

    The Qianhe gold deposit in the Xiong'ershan area is located along the southern margin of the Archean-Paleoproterozoic North China Craton. The deposit consists of six orebodies that are hosted in Paleoproterozoic andesites to basaltic andesites and structurally controlled by roughly EW-trending faults. Individual orebodies comprise auriferous quartz veins and disseminated Au-bearing pyrite within hydrothermally altered rocks on both sides of, or close to, the veins. Ore-related hydrothermal alteration has produced various mixtures of K-feldspar, quartz, sericite, chlorite, epidote, carbonate, and sulfides. Pyrite is the most important ore mineral, associated with minor amounts of galena, sphalerite, and chalcopyrite. Other trace minerals include molybdenite, arsenopyrite, scheelite, rutile, xenotime, and parisite. Gold occurs mostly as native gold and electrum enclosed in pyrite or along microfractures of sulfides and quartz. Microthermometric measurements of primary inclusions in auriferous quartz suggest that gold and associated minerals were precipitated in the range of 160-305 °C from aqueous or carbonic-aqueous fluids with salinities of 6-22 wt% NaCl equiv. Samples of molybdenite coexisting with Au-bearing pyrite have Re-Os model ages of 134-135 Ma, whereas ore-related hydrothermal sericite separates yield 40Ar/39Ar plateau ages between 127 and 124 Ma. The Re-Os and 40Ar/39Ar ages are remarkably consistent with zircon U-Pb ages (134.5 ± 1.5 and 127.2 ± 1.4 Ma; 1 σ) of the biotite monzogranite from the Heyu-intrusive complex and granitic dikes in and close to the Qianhe gold mine, indicating a close temporal and thus possibly genetic relationship between gold mineralization and granitic magmatism in the area. Fluid inclusion waters extracted from auriferous quartz have δD values of -80 to -72 ‰, whereas the calculated δ 18OH2O values range from 3.1 to 3.8 ‰. The hydrogen and oxygen isotopes from this study and previous work indicate that ore fluids

  8. Noise-based body-wave seismic tomography in an active underground mine.

    NASA Astrophysics Data System (ADS)

    Olivier, G.; Brenguier, F.; Campillo, M.; Lynch, R.; Roux, P.

    2014-12-01

    Over the last decade, ambient noise tomography has become increasingly popular to image the earth's upper crust. The seismic noise recorded in the earth's crust is dominated by surface waves emanating from the interaction of the ocean with the solid earth. These surface waves are low frequency in nature ( < 1 Hz) and not usable for imaging smaller structures associated with mining or oil and gas applications. The seismic noise recorded at higher frequencies are typically from anthropogenic sources, which are short lived, spatially unstable and not well suited for constructing seismic Green's functions between sensors with conventional cross-correlation methods. To examine the use of ambient noise tomography for smaller scale applications, continuous data were recorded for 5 months in an active underground mine in Sweden located more than 1km below surface with 18 high frequency seismic sensors. A wide variety of broadband (10 - 3000 Hz) seismic noise sources are present in an active underground mine ranging from drilling, scraping, trucks, ore crushers and ventilation fans. Some of these sources generate favorable seismic noise, while others are peaked in frequency and not usable. In this presentation, I will show that the noise generated by mining activity can be useful if periods of seismic noise are carefully selected. Although noise sources are not temporally stable and not evenly distributed around the sensor array, good estimates of the seismic Green's functions between sensors can be retrieved for a broad frequency range (20 - 400 Hz) when a selective stacking scheme is used. For frequencies below 100 Hz, the reconstructed Green's functions show clear body-wave arrivals for almost all of the 153 sensor pairs. The arrival times of these body-waves are picked and used to image the local velocity structure. The resulting 3-dimensional image shows a high velocity structure that overlaps with a known ore-body. The material properties of the ore-body differ from

  9. Silver-cobalt mineralization in the Upper Seymchan ore cluster, Northeastern Russia

    NASA Astrophysics Data System (ADS)

    Goryachev, N. A.; Gamyanin, G. N.; Prokof'ev, V. Yu.; Savva, N. E.; Velivetskaya, T. A.; Ignat'ev, A. V.

    2014-09-01

    This paper is focused on the Early Cretaceous Ag-Bi-Co-sulfoarsenide mineralization atypical of northeastern Asia, which contains diverse Co-Ni sulfoarsenides, Se-bearing Bi sulfotellurites, and Ag-Bi-Pb sulfosalts. The Upper Seymchan ore cluster is located at the boundary between the Paleozoic Omulevka Terrane of carbonate platform and the In'yali-Debin Synclinorium of the Kular-Nera Terrane. These ore-bearing sequences are represented by the Middle Jurassic terrigenous rocks that rest upon the Upper Triassic sandshale rocks of the upper structural stage. The sedimentary rocks are cut through by high-Al granitic plutons and younger granite-porphyry dikes. The orebodies that are superposed on igneous rocks were formed during (1) the quartz-chlorite-tourmaline stage of metasomatic alteration, (2) the main economic tourmaline-chlorite-quartz-sulfoarsenide vein stage, (3) the polysulfide-quartz stage with Ag, Se, Bi minerals, and (4) the postore quartz-calcite stage with fluorite. The epithermal veins of festoon chalcedony-like quartz with Sb-bearing arsenopyrite occupy a special position. In particular orebodies, the chlorite-quartz ore veins dominate at the upper levels, whereas the quartz-tourmaline veins occur at the lower levels. Wall-rock alteration is represented by metasomatic chloritization and tourmalinization up to the formation of monomineralic metasomatic zones. Sulfides and sulfoarsenides are distinguished by anomalous enrichment of sulfur in the light isotope (δ34S = -12.8 to -16.7‰) in contrast to the sulfur isotopic composition of Sb-asenopyrite (-1.7‰) from the genetically different epithermal veins. The oxygen isotopic composition of calcite (the third stage) is uniform at all studied deposits and reveals a tendency to updip enrichment in δ18O within a vertical interval of 200 m. Quartz from ore-bearing and epithermal veins has an almost identical δ18O value (±2‰) but differs from quartz at the tin deposits related to granites of the

  10. Genesis of the Datuanshan stratabound skarn Cu(-Mo) deposit, Middle-Lower Yangtze Valley, Eastern China: constraints from geology, Re-Os geochronology, mineralogy, and sulfur isotopes

    NASA Astrophysics Data System (ADS)

    Cao, Yi; Gao, Fuping; Du, Yangsong; Du, Yilun; Pang, Zhenshan

    2017-03-01

    Stratabound deposits are the most abundant and economically significant ore type in the Middle-Lower Yangtze River Valley, one of the most important metallogenic belts in China. The Datuanshan deposit is one of the largest and most representative stratabound Cu(-Mo) deposits in the Tongling district of the Middle-Lower Yangtze River metallogenic belt. All the orebodies of the Datuanshan deposit occur around Mesozoic quartz monzodiorite and are tabular or semi-tabular bodies along bedding-parallel faults within upper Permian to Lower Triassic strata. However, discordant and crosscutting relationships (e.g., the host rocks crosscut by skarn- and quartz-sulfide veins, with alteration halos around the veins) have also been found, especially along the skarn-host contact and orebody-host contact, indicating that skarnitization and mineralization postdated the deposition of the host sediments. The skarn consists mainly of prograde garnet and pyroxene and retrograde alteration assemblages of amphibole, epidote, and chlorite, as well as quartz and sulfides. Electron microprobe analyses show that the garnets and pyroxenes are grossular-andradite and hedenbergite-diopside series, respectively, and all samples plot in the field of typical skarn copper deposits worldwide. Molybdenite samples from stratiform copper ores yield Re-Os model ages of 138.2-139.9 Ma with a weighted mean age of 139.2 ± 0.9 Ma. This is reasonably consistent with the ages of the stratiform Mo ores (138.0-140.8 Ma) and genetically related quartz monzodiorite (135.2-139.3 Ma) in the Datuanshan deposit, indicating that the stratiform Cu and Mo mineralization was contemporaneous with emplacement of the quartz monzodiorite magmas in the Early Cretaceous. Fifteen δ34S values for sulfides range from -1.8 to +4.7 ‰, with a mean of 0.5 ‰, indicating that the sulfur was derived mainly from a magmatic source. Moreover, the sulfur isotope values of the ores are consistent with those of Mesozoic intermediate

  11. Structural localization and origin of compartmentalized fluid flow, Comstock lode, Virginia City, Nevada

    USGS Publications Warehouse

    Berger, B.R.; Tingley, J.V.; Drew, L.J.

    2003-01-01

    Bonanza-grade orebodies in epithermal-style mineral deposits characteristically occur as discrete zones within spatially more extensive fault and/or fracture systems. Empirically, the segregation of such systems into compartments of higher and lower permeability appears to be a key process necessary for high-grade ore formation and, most commonly, it is such concentrations of metals that make an epithermal vein district world class. In the world-class silver- and gold-producing Comstock mining district, Nevada, several lines of evidence lead to the conclusion that the Comstock lode is localized in an extensional stepover between right-lateral fault zones. This evidence includes fault geometries, kinematic indicators of slip, the hydraulic connectivity of faults as demonstrated by veins and dikes along faults, and the opening of a normal-fault-bounded, asymmetric basin between two parallel and overlapping northwest-striking, lateral- to lateral-oblique-slip fault zones. During basin opening, thick, generally subeconomic, banded quartz-adularia veins were deposited in the normal fault zone, the Comstock fault, and along one of the bounding lateral fault zones, the Silver City fault. As deformation continued, the intrusion of dikes and small plugs into the hanging wall of the Comstock fault zone may have impeded the ability of the stepover to accommodate displacement on the bounding strike-slip faults through extension within the stepover. A transient period of transpressional deformation of the Comstock fault zone ensued, and the early-stage veins were deformed through boudinaging and hydraulic fragmentation, fault-motion inversion, and high- and low-angle axial rotations of segments of the fault planes and some fault-bounded wedges. This deformation led to the formation of spatially restricted compartments of high vertical permeability and hydraulic connectivity and low lateral hydraulic connectivity. Bonanza orebodies were formed in the compartmentalized zones of

  12. Genesis of the Datuanshan stratabound skarn Cu(-Mo) deposit, Middle-Lower Yangtze Valley, Eastern China: constraints from geology, Re-Os geochronology, mineralogy, and sulfur isotopes

    NASA Astrophysics Data System (ADS)

    Cao, Yi; Gao, Fuping; Du, Yangsong; Du, Yilun; Pang, Zhenshan

    2016-07-01

    Stratabound deposits are the most abundant and economically significant ore type in the Middle-Lower Yangtze River Valley, one of the most important metallogenic belts in China. The Datuanshan deposit is one of the largest and most representative stratabound Cu(-Mo) deposits in the Tongling district of the Middle-Lower Yangtze River metallogenic belt. All the orebodies of the Datuanshan deposit occur around Mesozoic quartz monzodiorite and are tabular or semi-tabular bodies along bedding-parallel faults within upper Permian to Lower Triassic strata. However, discordant and crosscutting relationships (e.g., the host rocks crosscut by skarn- and quartz-sulfide veins, with alteration halos around the veins) have also been found, especially along the skarn-host contact and orebody-host contact, indicating that skarnitization and mineralization postdated the deposition of the host sediments. The skarn consists mainly of prograde garnet and pyroxene and retrograde alteration assemblages of amphibole, epidote, and chlorite, as well as quartz and sulfides. Electron microprobe analyses show that the garnets and pyroxenes are grossular-andradite and hedenbergite-diopside series, respectively, and all samples plot in the field of typical skarn copper deposits worldwide. Molybdenite samples from stratiform copper ores yield Re-Os model ages of 138.2-139.9 Ma with a weighted mean age of 139.2 ± 0.9 Ma. This is reasonably consistent with the ages of the stratiform Mo ores (138.0-140.8 Ma) and genetically related quartz monzodiorite (135.2-139.3 Ma) in the Datuanshan deposit, indicating that the stratiform Cu and Mo mineralization was contemporaneous with emplacement of the quartz monzodiorite magmas in the Early Cretaceous. Fifteen δ34S values for sulfides range from -1.8 to +4.7 ‰, with a mean of 0.5 ‰, indicating that the sulfur was derived mainly from a magmatic source. Moreover, the sulfur isotope values of the ores are consistent with those of Mesozoic intermediate

  13. An Inexpensive Way of Teaching Uncertainty and Mineral Exploration Drilling in the Classroom

    NASA Astrophysics Data System (ADS)

    Aquino, J. S.

    2014-12-01

    This presentation is all about inexpensive ways of teaching uncertainty and mineral exploration drilling in the classroom. These labs were developed as an off-shoot of my years of mineral industry experience before I transitioned to geoscience education. I have developed several classroom lab exercises that relate to the role of modeling, uncertainty and prediction in mineral exploration. These lessons are mostly less expensive ($<5/group) hands-on activities that can be differentiated across grade levels. Early in the semester, modeling is explored through the cube and toilet paper roll puzzle lab. This is then immediately followed by the penny experiment that gives a physical meaning to the concept of uncertainty. However, it is the end-of-semester shoebox drilling lab that serves as the culminating activity for modeling, uncertainty and prediction. An object (orebody) is hidden inside a shoebox and the students are challenged to design a drilling program to predict the location and topology of a "mineral deposit". The students' decision on the location of the first few drill holes will be based on how they analyze, synthesize and evaluate simple surface topographic, geologic and geochemical +/- geophysical data overlain on top of the box. Before drilling, students are required to construct several geologic sections that will "model" the shape of the hidden orebody. Using bamboo skewers as their drilling equipment, students then commence their drilling and along the way learn the importance of drill spacing in decreasing uncertainty or increasing confidence. Lastly, the mineral separation lab gives them an opportunity to design another experiment that mimics mineral processing and learns a valuable lesson on the difficulties in recovery and how it relates to entropy (no such thing as 100% recoverability). The last two labs can be further enhanced with economic analysis through incorporation of drilling and processing costs. Students further appreciate the world

  14. Cretaceous Cu-Au, pyrite, and Fe-oxide-apatite deposits in the Ningwu basin, Lower Yangtze Area, Eastern China

    NASA Astrophysics Data System (ADS)

    Yu, Jin-Jie; Lu, Bang-Cheng; Wang, Tie-Zhu; Che, Lin-Rui

    2015-05-01

    The Cretaceous Ningwu volcanic basin of the Middle and Lower Yangtze River Valley metallogenic belt of eastern China hosts numerous Fe-oxide-apatite, Cu-Au, and pyrite deposits. The mineralization in the Ningwu basin is associated with subvolcanic rocks, consisting of gabbro-diorite porphyry and/or pyroxene diorite. However, the mineralization is associated with subvolcanic and volcanic rock suite belonging to the Niangniangshan Formation in the Tongjing Cu-Au deposit, including nosean-bearing aegirine-augite syenites, quartz syenites, and quartz monzonites. The zoning displayed by the alteration and mineralization comprises: (1) an upper light-colored zone of argillic, carbonate, and pyrite alteration and silicification that is locally associated with pyrite and gold mineralization, (2) a central dark-colored zone of diopside, fluorapatite-magnetite, phlogopite, and garnet alteration associated with fluorapatite-magnetite mineralization, and (3) a lowermost light-colored zone of extensive albite alteration. The Cu-Au and pyrite orebodies are peripheral to the Fe-oxide-apatite deposits in this area and overlie the iron orebodies, including the Meishan Cu-Au deposit in the northern Ningwu basin and the pyrite deposits in the central Ningwu basin. The δ34S values of sulfides from the Fe-oxide-apatite, Cu-Au, and pyrite deposits in the Ningwu basin show large variation, with a mixed sulfur source, including magmatic sulfur and/or a mixture of sulfur derived from a magmatic component, country rock, and thermochemical reduction of sulfate at 200-300 °C. The ore-forming fluids associated with iron mineralization were derived mainly from magmatic fluids, and the late-stage ore-forming fluids related to Cu-Au and pyrite mineralization may have formed by the introduction of cooler meteoric water to the system. The Fe-oxide-apatite, Cu-Au, and pyrite deposits of the Ningwu basin formed in an extensional environment and are associated with a large-scale magmatic

  15. Infrared spectral identification of metasomatic alteration minerals and its implication to gold exploration in Shihu Gold Deposit, Hebei Province, P.R. China

    NASA Astrophysics Data System (ADS)

    Liu, Jiacheng; Yao, Yuzeng; Wang, Yingpeng; Yuan, Zhou

    2014-11-01

    Hydrothermal alteration is of great importance for mineral exploration, especially the blind ore-hunting due to its larger scale and special zonation compared to the ore bodies. Infrared spectral identification of metasomatic alteration minerals can be done with little or no sample preparation and quantitative result can be obtained. In this paper, 65 wall-rock samples of several horizontal and vertical profiles were selected from Shihu Gold deposit in Hebei Province to do reflectance spectrum measurements by means of rough surface, smooth section and powder with portable ASD FieldSpec®3 spectrometer. ViewspecPro software was used to preprocess the spectrum, and metasomatic alteration minerals were spectrally discriminated by SII (Spectral International Inc) Specmin software package with wavelength of 1100~2500nm. The results shows that: (1) among all the three spectral libraries embedded in SPECMIN software, i.e., ASD, USGS and JPL, ASD spectral library is more suitable for the spectral hydrothermal alteration minerals identification in Shihu Gold Deposit; (2) the observed mineral zonation from wall-rock gneiss to ore-body indicates obvious downtrend of amphibole, chlorite, sericite, carbonate and barite, which is consistent with the microscopic and XRD results; (3) spectral identification of metasomatic alteration minerals is theoretically feasible, which is economic and convenient, and most important of all, the result can be quantitative or semi-quantitative. The results are helpful and successfully applied to the further mineral exploration in Shihu Gold Deposit.

  16. Geologic map of the Weka Dur gold deposit, Badakhshan Province, Afghanistan, modified from the 1967 original map compilation of M.P. Guguev and others

    USGS Publications Warehouse

    Peters, Stephen G.; Stettner, Will R.; Masonic, Linda M.

    2014-01-01

    The Weka Dur gold deposit lies in a cluster of other gold deposits in Badakhshan Province (Ragh district), such as the Kadar, Nesheb Dur, and Rishaw gold occurrences. These gold occurrences lie within a zone of late Hercynian folding and are most likely related to fluids that originated from orogenic processes. The Weka Dur deposit is the largest recorded gold occurrence in Afghanistan and is hosted in Proterozoic mica schist and amphibolite that is intruded by diabase dikes and other intrusive rocks. The tabular orebody is 350 meters (m) long and 2 m wide and can be traced downdip for 110 m. Mineralization consists of ochreous, brecciated schists containing high gold concentrations along gently and steeply dipping fissures. The brecciated rocks grade to 46.7 grams per ton (g/t) silver and contain arsenopyrite, galena, chalcopyrite, and scheelite. Trenches and adits were constructed, mapped, and sampled during the 1960s. Calculated resources are 958.3 kilograms of gold, averaging 4.1 g/t gold.

  17. The solubilities of some major and minor element minerals in ground waters associated with a sandstone-hosted uranium deposit.

    USGS Publications Warehouse

    Wanty, R.B.; Chatcham, J.R.; Langmuir, D.

    1987-01-01

    Ground-water samples from 41 wells penetrating basal Oakville sandstone (Miocene) in S Texas were chemically analysed to identify chemical changes related to nearby U orebodies. The coverage included a 240 km2 area which contains several fault-related U deposits. Factors affecting the hydrochemistry include: 1) relatively high permeabilities of buried fluvial-channel sediments; 2) upwards leakage of brines along growth faults into the aquifer; 3) development of a redox interface (Eh = 0 volts) within the aquifer; and 4) the semi-arid climate. Variations in the saturation index (SI) for chemically reduced minerals of U, As, Mo, Se and for associated minerals such as pyrite outlined the position of known deposits. The SI increases towards zero as the deposits are approached from updip distances of 3-4.5 km, then decreases again downdip. The radiogenic pathfinders Ra and Rn showed very strong anomalies with ore, but diminished to background levels at short distances from ore. A strong He anomaly is deflected in the direction of ground-water flow away from the ore.-R.A.H.

  18. Tempo of magma degassing and the genesis of porphyry copper deposits

    PubMed Central

    Chelle-Michou, Cyril; Rottier, Bertrand; Caricchi, Luca; Simpson, Guy

    2017-01-01

    Porphyry deposits are copper-rich orebodies formed by precipitation of metal sulphides from hydrothermal fluids released from magmatic intrusions that cooled at depth within the Earth’s crust. Finding new porphyry deposits is essential because they are our largest source of copper and they also contain other strategic metals including gold and molybdenum. However, the discovery of giant porphyry deposits is hindered by a lack of understanding of the factors governing their size. Here, we use thermal modelling and statistical simulations to quantify the tempo and the chemistry of fluids released from cooling magmatic systems. We confirm that typical arc magmas produce fluids similar in composition to those that form porphyry deposits and conclude that the volume and duration of magmatic activity exert a first order control on the endowment (total mass of deposited copper) of economic porphyry copper deposits. Therefore, initial magma enrichment in copper and sulphur, although adding to the metallogenic potential, is not necessary to form a giant deposit. Our results link the respective durations of magmatic and hydrothermal activity from well-known large to supergiant deposits to their metal endowment. This novel approach can readily be implemented as an additional exploration tool that can help assess the economic potential of magmatic-hydrothermal systems. PMID:28079160

  19. Surface Mine Design and Planning for Lunar Regolith Production

    NASA Astrophysics Data System (ADS)

    Gertsch, Leslie Sour; Gertsch, Richard E.

    2003-01-01

    Terrestrial surface mine design and planning techniques are applied to the production of lunar regolith for manufacturing makeup gases for the life-support system of a lunar base. Two scenarios are examined, due to the uncertainty of whether bound hydrogen sensed near the lunar poles is from cometary ice deposited in cold traps (mesh 1), or to hydrogen implanted within regolith grains by the solar wind (mesh 2). Scenario mesh 1, with a total production requirement of 44 tonne/day of regolith, could be handled with four groups of four 6-m3 capacity slushers (drag scrapers), each group extending 100 m around a single processing module. Scenario mesh 2 (4.382 tonne/day) could be accomplished with three powered bowl-type scrapers (capacity 24 m3) gathering the regolith into long windrows feeding a large processor. The present orebody model is extremely thin (1 m), although broad in extent: this prevents usage of high production-rate systems such as large draglines.

  20. Preliminary investigation of the elemental variation and diagenesis of a tabular uranium deposit, La Sal Mine, San Juan County, Utah

    USGS Publications Warehouse

    Brooks, Robert A.; Campbell, John A.

    1976-01-01

    Ore in the La Sal mine, San Juan County, Utah, occurs as a typical tabular-type uranium deposit of the-Colorado Plateau. Uranium-vanadium occurs in the Salt Wash Member of the Jurassic Morrison Formation. Chemical and petrographic analyses were used to determine elemental variation and diagenetic aspects across the orebody. Vanadium is concentrated in the dark clay matrix, which constitutes visible ore. Uranium content is greater above the vanadium zone. Calcium, carbonate carbon, and lead show greater than fifty-fold increase across the ore zone, whereas copper and organic carbon show only a several-fold increase. Large molybdenum concentrations are present in and above the tabular layer, and large selenium concentrations occur below the uranium zone within the richest vanadium zone. Iron is enriched in the vanadium horizon. Chromium is depleted from above the ore and strongly enriched below. Elements that vary directly with the vanadium content include magnesium, iron, selenium, zirconium, strontium, titanium, lead, boron, yttrium, and scandium. The diagenetic sequence is as follows: (1) formation of secondary quartz overgrowths as cement; (2) infilling and lining of remaining pores with amber opaline material; (3) formation of vanadium-rich clay matrix, which has replaced overgrowths as well as quartz grains; (4) replacement of overgrowths and detrital grains by calcite; (5) infilling of pores with barite and the introduction of pyrite and marcasite.