9. Metallurgy
9.1 General
The very high occurrence of silver in sulfides and sulfosalts means that only 43% of silver production comes from silver and gold ores; the rest of the world's production comes from the processing of copper, lead and zinc ores
It should also be considered that a large proportion of the silver-bearing minerals are insoluble or only slightly soluble during cyanidation, giving the ore a refractory character. Added to this disadvantage is the precipitation of Ag2S, even in the presence of small amounts of sulfur. Ag2S is insoluble in cyanide medium in the absence of oxidation. Oxidative roasting must therefore precede leaching, but has the disadvantage of generating SO2 and As2O3...
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