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Extracting Gold | HowStuffWorks

Removing the -bearing rock from the ground is just the first step. To isolate pure , companies use a complex extraction process. The first step in this process is breaking down large chunks of rock into smaller pieces. At a mill, large known as crushers reduce the to pieces no larger than road gravel.

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Mining History and Geology of the California Gold Rush

History and Geology of the California Rush. The Nature of . Chemical Symbol:Au Atomic Number:79 Atomic weight: 196.967 Specific Gravity:19.3 19.3 times as heavy as an equivalent volume of water twice as heavy as pure lead 1 cubic foot weighs over 1/2 ton Hardness: 2.5-3 on the Mohs hardness scale teeth are harder, miners are sometimes pictured biting nuggets to test the ...

Processing, smelting and refining gold | World Gold Council

When dissolution is complete, the -bearing solution is separated from the solids. With of higher content greater than 20 grams of per tonne of , cyanidation is accomplished by vat leaching, which involves holding a slurry of and solvent in large tanks equipped with agitators.

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 · A mine was under severe pressure because the grade of the body it was had fallen by around 20 percent. The mine had increased -production volumes to try to offset the decline, but it was running into difficulties because this was overloading its leaching plant and incurring higher costs on energy, chemicals, and other ...

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