Recovery of precious metals from difficult ores

Details Recovery of precious metals from difficult ores Recovery of precious metals from difficult ores

C - Chemistry, Metallurgy

22

B

53/225

C22B 11/04 (1980.01)

Patent

CA 1148748

ABSTRACT OF THE DISCLOSURE Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.5, and at least 0.05% sulfite ion.

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