RIO MADRE DE DIOS, AMAZONIA, PERU-NOVEMBER 25: Man search gold illegally in Madre de Dios river in peru on November, 25, 2010. Mercury is used by poor gold-diggers to wash gold off rock and sand.
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RIO MADRE DE DIOS, AMAZONIA, PERU-NOVEMBER 25: Man search gold illegally in Madre de Dios river in peru on November, 25, 2010. Mercury is used by poor gold-diggers to wash gold off rock and sand.