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Jan 03, 2014· The economics of such smallscale operations can be a gamble; mill operators pay about 150,000 rupiah, or, for a sack of ore and sell the resulting gold amalgam to .

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Hard rock gold mining extracts gold encased in rock, ... Gold ore processing In placer mines, the gold is recovered by gravity separation. ... Largescale use of mercury stopped in the 1960s. However, mercury is still used in artisanal and smallscale gold mining (ASGM), often clandestine, gold .

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