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  • What does the grade of a gold mine refer to? | Investopedia

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    Sep 15, 2007· Ancient gold smelting rare today extract recovery process of refining gold to remove any impurities - Duration: 10:32 Archimedes Channel 744,429 views

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    A detailed guide to gold mining, , Good quality ores give up their gold under cyanidation in what is called vat leaching Lesser quality ores require heap .

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    Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by .

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