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By 2000 bc the process of purifying gold silver alloys with salt to remove the silver was developed. The mining of alluvial deposits and, later, lode or vein...Live Chat
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Extracting Gold - Extracting Gold | HowStuffWorks
To isolate pure gold, mining companies use a complex extraction process. The first step in ... Leaching dissolves the gold out of the ore using a chemical solvent.Live Chat