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The gold deposits are presently all mined by thousands of small-scale miners. All mining, crushing and grinding are done by hand and the ground ore is treated with metallic mercury, whereby the very fine-grained gold amalgamates with the mercury. The mercury is subsequently burned off over small fires.

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Jul 11, 2018· Artisanal and Small-Scale Gold Mining Without Mercury - EPA. Feb 22, 2018 Although many miners use mercury in artisanal and small-scale gold mining, Before concentration can begin, ore must be crushed or milled to liberate . manually depending on …

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Many artisanal and small-scale miners are achieving high rates of gold recovery without mercury, benefiting their health, the health of their communities, and the environment. On this page, we summarize some of the techniques in mercury-free artisanal and small-scale gold mining.