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. It is also used in mining kaolin and coal. Hydraulic mining originated out of ancient...
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http://en.wikipedia.org/wiki/Hydraulic_mining
use of a powerful jet of water to dislodge minerals present in unconsolidated material, including mine tailings, placer deposits, alluvium, laterites ... [1 related articles]
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http://www.britannica.com/eb/a-z/h/88
placer mining using a pressurized stream of water. Also called hy&syl;drau&syl;lick&syl;ing
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https://www.infoplease.com/dictionary/hydraulic-mining
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