A longer-lasting impact comes from mercury used to separate tiny flecks of gold from fine sediment. Typically, workers mix mercury with the gold-bearing sand to form a lump, then blast it with a torch, vaporizing the mercury and leaving behind a lump of gold.
read more... https://www.ncronline.org/news/earthbeat/illegal-gold-mining-booms-brazilian-amazon-harming-environment-health
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