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Peter C Mason, Patrick T O Kane, Robert Pendreigh: Precious metals recovery from refractory carbonate ores. First Miss Gold, Sheridan Ross & McIntosh, December 25, 1990: US04979987 (14 worldwide citation)

Precious metal values, particularly gold and silver, are liberated from refractory, carbonate ores by adjusting the molar ratio of sulfide to total acid consumers to between about 1.2 and about 3.2 in the ore feed to a pressure oxidation process. The ore is contacted with oxygen to oxidize sulfide i ...


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