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Dec 16, 2012· How to Mine Hard Rock for Gold | eHow. Hard-rock gold mining has grown increasingly less common as the years have passed and was most abundant during the early to mid-1900s.
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Hydraulic mining, or hydraulicking, is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment. In the placer mining of gold or tin, the resulting water-sediment slurry is directed through sluice boxes to remove the gold.
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