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Summary Historically, the majority of gold was mined from "placer deposits", where gold has settled out of an existing or ancient waterway downstream of where nuggets had eroded out of rock outcropsSome early miners also used an early form of hardrock mining, digging solid veins of gold out of rock, where mineralized water had ,...

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Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds Soft rock mining refers to excavation ,...

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Alluvial and Hard-Rock Gold Recovery From exploration through to full-scale production and tailings re-processing, our systems are used for Alluvial or Placer Gold Mining and Hard Rock Gold Mining applications worldwide in operations where high recovery rate drives profitability...

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Gold mining - Wikipedia Hard rock gold mining extracts gold encased in rock, rather than fragments in loose sediment, and produces most of the world's gold...

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California's giant gold machines were the best in the world, but wrecked havoc on California's environment Massive floating dredges scooped up millions of tons of river gravels; hard rock miners blasted and tunneled their way into the mountains; giant hydraulic monitors literally blew apart the hills and washed them into the streams and rivers Tons of mercury used to extract the gold ,...

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There are hard-rock underground mines, and there are soft-rock underground min Coal deposits, for instance, live in relatively soft sedimentary rock Gold deposits live in igneous or metamorphic rock, which is relatively hard, as do diamonds, copper, silver, nickel and zinc [source: Great Mining ....

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