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THE CHEMISTRY OF THE EXTRACTION OF GOLD necessary to take this argument a step further. In general, whether the oxidation of gold to the complex AuL; or AuL!+ occurs in the presence of

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Heap Leaching of Gold In 2014 about 150 major gold-silver mines worldwide utilized HL technology and recovered about 15 million troy ounces of gold, roughly 17% of global gold production (~89 million troy ounces, according to USGS data).

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Gold and silver typically occur at very low concentrations in ores - less than 10 g/t or 0.001% (mass basis). At these concentrations the use of aqueous chemical (hydrometallurgical) extraction processes is the only economically viable method of extracting the gold and silver from the ore.

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Elemental gold has a specific gravity of 19.3, and typical ore has a specific gravity of about 2.6. All gravity concentration devices create movement between the gold and host rock particles in a manner to separate the heavy pieces from the lighter pieces of material. The prospector's gold pan is the most familiar gravity concentration device.

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Mining - Wikipedia

Spain was one of the most important mining regions, but all regions of the Roman Empire were exploited. In Great Britain the natives had mined minerals for millennia, but after the Roman conquest, the scale of the operations increased dramatically, as the Romans needed Britannia's resources, especially gold, silver, tin, and lead.

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Surface Mining Methods and Equipment

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Gold Extraction & Recovery Processes

For gold extraction the strength of cyanide solution ranges from 0.01 to 0.05%. Lime is added to the process in order to have a pH near to 10-11. The different minerals foreign substances can affect the cyanidation process in a number of different ways.

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