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    Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.

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    Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.

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    A simple still like those used to make alcohol would draw away the vaporized mercury, possibly collecting it for reuse, leaving mostly pure gold. Though the gold would have to be refined later for greater purity, the amalgamation with mercury allowed the efficient extraction of gold from poor-quality ores that were not economical by other means.

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    ‘Any way to reduce the reliance on cyanide in gold extraction is certainly going to be very attractive for both environmental and societal reasons,’ says John Provis, a chemical engineer at the University of Sheffield, UK. ‘The most appealing points are the ability to recover the gold with a fairly simple separation step, and its high selectivity for gold over platinum and palladium ...

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    Gold is yellow because of the way its electrons behave. [1] [2] The only other metal in common use that has a non-gray color is copper . Metallic gold is non-toxic, which is unusual for a heavy metal .

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