Mercury and methylmercury concentrations were measured in mine wastes, stream sediments, and stream waters collected both proximal and distal from abandoned ... ...

... Abandoned Mercury Mines: Conversion of relatively stable inorganic mercury compounds to bioavailable organic mercury forms, such as methylmercury, ... evaluate mercury speciation and biochemical transform...

The distribution and bioaccumulation of mercury in the North Fork of the Holston River--Cherokee Reservoir which receives mercury inputs from an abandoned chlor-alkali plant were studied to determine the behavior and ultimate fate of mercury in this syste...

This presentation discusses EPA's research activities and mitigation activities for mercury contaminated mine sites at the International meeting on mercury and artisanal gold mining in Lima, Peru. The topics discussed included the toxicological and enviornmental tasks associated ...

The distribution and bioaccumulation of mercury in the North Fork of the Holston River--Cherokee Reservoir which receives mercury inputs from an abandoned chlor-alkali plant were studied to determine the behavior and ultimate fate of mercury in this system. Mercury in the dissolved form appears ...

Mercury content of egg and eggshell from Whiskered Terns of Anzali wetlands of the Caspian Sea were determined. Mercury levels in egg content of both abandoned (433 � 4) and non-abandoned (459 � 15) eggs were 150 times greater than eggshells. Eggshell thickness differed between ...

In the mercury mining area of Mount Amiata metal contents were determined in plant parts of Pinus nigra, Cedrus atlantica and Cytisus scoparius, in lichens and in soil. Mercury concentrations were higher in vegetation growing on spoil banks of abandoned roasted cinnabar than near geothermal power plants. Green plant parts accumulated ...

... determined mercury content in nonviable and abandoned bird eggs collected between 1993 and 2004 from ten locations along the Maine coast. Eighty-two eggs from seven species were collected. Fifty eggs wer...

Clear Lake, one of California's largest freshwater lakes located approximately 150 km north of San Francisco, is an important natural, economic, and cultural resource for the surrounding community. Elevated mercury levels in fish, first identified in the late 1970s, have been a ...

NRMRL-ADA-01319 Jewett*, D.G., Manges, E., Reller, G.J., Engle, and Bauman. Water-Rock Interactions Influencing Mercury Fate and Transport From An Abandoned Mine Site To An Adjacent Aquatic Ecosystem. Amer. Geophysical Union Conference, San Francisco, CA, 12/10-14/2001. 2001. 0...

The Sulphur Bank Mercury Mine (SBMM) is an abandoned sulphur and cinnabar mine located on the eastern shore of the Oaks Arm of Clear Lake, Lake County, California. SBMM was one of the largest mercury producers in California and has been described as one of the most productive sh...

Mercury and methylmercury concentrations were measured in mine wastes, stream sediments, and stream waters collected both proximal and distal from abandoned mercury mines to evaluate mercury contamination and mercury methylation in the Humboldt River system. The climate in the study area is ...

;64:866 876. Mason RP, Sullivan KA. Mercury and methylmercury transport through an urban watershed. Water Res effectiveness in streams dominated by episodic mercury discharges Dyan C. Whytea,U , James W. Kirchnerb contaminant sources and establishing cleanup goals. Z .We monitored mercury discharges from an ...

The watershed of Lake Nacimiento has several abandoned or inactive mercury mines. The Klau/Buena Vista Mines have been identified as the major source of mercury in Lake Nacimiento sediment. The water is safe to drink and recreate in. However, mercury in t...

Concentrations and loads of total mercury and methylmercury were measured in streams draining abandoned mercury mines and in the proximity of geothermal discharge in the Cache Creek watershed of California during a 17-month period from January 2000 through May 2001. Rainfall and runoff were lower than long-term averages during the ...

Mercury concentrations are usually significant in historic Hg mining districts all over the world, so the atmospheric environment is potentially affected. In Asturias, northern Spain, past mining operations have left a legacy of ruins and Hg-rich wastes, soils and sediments in abandoned sites. Total Hg concentrations in the ambient air of these ...

Clear Lake, located 150 km north of San Francisco, is one of the largest fresh water lakes in California and is an important economic resource for the region. Elevated mercury levels in fish in Clear Lake were identified in the late 1970s, resulting in a fish consumption advisor...

This paper reports on boron, chloride, sulfate, �D, �18O, and 3H concentrations in surface water and groundwater samples from the Sulphur Bank Mercury Mine, California (SBMM) to examine and provide constraints on the site�s groundwater system. SBMM is an abandoned sulfur and merc...

Mercury is a global pollutant that can transform into methylmercury, a highly toxic and bioaccumulative organic form. Previous surveys have shown that fish is the main source of human methylmercury exposure, whereas most other food products have an average value below 20 microg/kg and primarily in the inorganic form. This paper reports that methylmercury in rice (Oryza sativa ...

Concentrations and mass loads of total mercury and methylmercury in streams draining abandoned mercury mines and near geothermal discharge in Cache Creek Basin, California, were measured during a 17-month period from January 2000 through May 2001. Rainfall and runoff averages during the study period were lower than long-term averages. ...

There are several abandoned Hg mines located in western Turkey. Hg production in these mines was eventually halted in the early 1990 s because of low prices and environmental concerns (Gemici, 2004). However, acid mine drainage waste causes potential environmental problems near the Hg mines. In T�rk�n� Hg mine (Fig. 1) nearly 7,000 flasks of mercury ...

In this study, mercury and methylmercury were measured in atmospheric, tributary, open-lake water column, sediment, planktons and fish samples in the catchments area of Lake An-dong, S. Korea. Lake An-dong, an artificial freshwater lake is located on the upstream of River Nak-dong. It has 51.5 km2 of open surface water and 1.33 year of hydraulic residence time. It is a source ...

The increasing societal demand for actions and strategies towards sustainability of small-scale gold mining in developing countries has led experts to face the challenge of managing the harzards associated with mercury pollution from active and abandoned mine sites. Mercury pollution in drainage systems and its health effects are the ...

This work describes an investigation of mercury contamination in an abandoned gold mining site in the rural area of Descoberto, Minas Gerais, Brazil, whose inhabitants have reported "silver balls" present in the soil. Different granulometric fractions of soil samples and sedimented material from rainwater retention tanks in this area were analyzed for ...

Mercury contamination is a globally significant problem. An important transformation in the mercury cycle is the conversion of inorganic mercury to methylmercury, a potent neurotoxin and bioaccumulant. This transformation is primarily bacterially-mediated, and sulfate-reducing bacteria (SRB) have been specifically implicated as key ...