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Manganese Dioxide Used In Smelting Of Gold Ore

2020-5-18In Mexico and elsewhere there are large bodies of valuable silver ore containing manganese which present great and hitherto insuperable obstacles to a satisfactory extraction by cyanide. The proportion of the silver that is soluble in cyanide varies greatly and may be as low as 5 only. The mere presence of manganese in the ore is not invariably accompanied by refractoriness of the silver

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