Gold and silver are obtained from a variety of ores, in some of which the gold predominates, in others silver is the primary value, while in still a third class these two metals may be mixed with the base metals, such as lead, copper, zinc, and iron.
caustic cyanide, gold and silver extrac tion is usually low with complex sulfide gold silver ores. A procedure to extract silver from sulfide ores with FeC13 was patented by Hey in 1922 . Considera ble work was completed by Wong to re cover lead from a galena concentrate with a combined FeC13 NaCl leach solution.
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Gold and silver are obtained from a variety of ores, in some of which the gold predominates, in others silver is the primary value, while in still a third class these two metals may be mixed with the base metals, such as lead, copper, zinc, and iron.