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By-product gold mining. Gold is also produced by mining in which it is not the principal product. Large copper mines, ... Advancements in the 1970s have seen activated carbon used in extracting gold from the leach solution. The gold is absorbed into the porous matrix of the carbon.

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Ore processing – Waihi Gold

Ore processing consists of the following stages: crushing and grinding of the ore; addition of process water (generally decanted from the tailings pond) to form a slurry; addition of lime to the ore, and cyanide solution to the slurry, to leach the gold and silver into solution


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The slurry (1) of ground ore and lime moves into a series of six leach tanks (2) where a sodium cyanide solution is added. The tanks provide sufficient retention time to allow the gold and silver to be dissolved by the cyanide solution. Oxygen is added to assist in this process. The slurry then moves through a series of carbon adsorption tanks (3).

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Gold. In-situ leaching has not been used on a commercial scale for gold mining. A three-year pilot program was undertaken in the 1970s to in-situ leach gold ore at the Ajax mine in the Cripple Creek district in the US, using a chloride and iodide solution.

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Nov 26, 2017· gold milling processing for small scale mining. Mercury free, small scale artisanal gold mining in Mozambique . Artisanal and small scale gold mining accounts for a significant portion of the use mercury amalgamation in the gold mining process, the privately owned Clean Tech Mine in the fine gold particles after grinding the ore in a ball mill and.

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