A study conducted by researchers at São Paulo State University (UNESP) in Rio Claro, Brazil, in partnership with colleagues at Queensland University of Technology in Australia found relatively high levels of mercury from gold panning that were accumulated in sediment in lakes in the Madeira Basin.
read more... https://smartwatermagazine.com/news/agencia-fapesp/brazilian-and-australian-researchers-estimate-impact-gold-panning-madeira-river
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