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    Gold miners excavate an eroded bluff with jets of water at a placer mine in Dutch Flat, California sometime between 1857 and 1870. Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, Advances in Gold Metallurgy Archived 2008 03 30 at the Wayback Machine.

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    Apr 11, 2017 . Gold Ore Processing .. Dry gravity concentration is exemplified by the separation of placer gold and associated heavy minerals from the lighter.

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    is EPA's Profile of the gold placer mining industry; the following sections extraction, beneficiation, and processing of ores and minerals" is excluded from to 1930, excavation equipment at open cut gold placer mines was steam powered,.

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