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gold extraction process using cyanide

Here I present anProcessEXAMPLE ofGold Extraction Cyanidein which the cyanidation feed consists of a pyrite concentrate floated after the selective flotation of a copper-goldconcentrate. The pyrite concentrate is reground to 90% minus 325 mesh and aerated in a high-lime solution prior to cyanidation. It contains 99% sulphides of which 10 to 20 percent is pyrrhotite and 0.3 to 0.7% ...

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