Mercury Contamination: The Lesser-known Legacy of the California Gold Rush

Nature World: New research shows that sediment-adsorbed mercury -- a lesser known legacy of California's historic gold rush -- is being transported by major floods from the Sierra Nevada mountains to Central Valley lowlands where it is threatening to infiltrate a series of food webs. These are the findings of Michael Singer, an associate researcher at the University of California, Santa Barbara's Earth Resource Institute, writing in the Proceedings of the National Academy of Science. His report reveals the......

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