In particular ore deposit, the noble metal (mainly silver) particles often has a state of being wrapped in the minerals manganese, manganese-containing silver up to 4 to 5 kg / ton gold from 2 to 10 g / t. The recovery method can recover manganese minerals by flotation, re-election and magnetic separation. In order to separate the precious metals from the manganese ore, the ore is usually treated with sulfurous acid prior to cyanidation 3 to 5 hours or, chlorides reductive roasting at 600 ℃ coal gas with the high manganese Mn becomes low, in order to improve Cyanide recovery of silver and gold.
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