developments in the processing of refractory & complex gold ores
developments in the processing of refractory & complex gold ores
developments in the processing of refractory & complex gold ores
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LOCKED GOLD<br />
Iron/Arsenic Sulphides - pretreatment processes <strong>in</strong>clude:<br />
• Roast<strong>in</strong>g <strong>of</strong> whole ore or flotation concentrate.<br />
• Low pressure <strong>in</strong>tensive oxidation.<br />
• Acid or alkal<strong>in</strong>e pressure oxidation <strong>of</strong> whole ore or flotation<br />
concentrate.<br />
• Bio-oxidation <strong>of</strong> flotation concentrate.<br />
• F<strong>in</strong>e or ultraf<strong>in</strong>e gr<strong>in</strong>d<strong>in</strong>g <strong>of</strong> flotation concentrate followed by<br />
direct cyanidation or one <strong>of</strong> <strong>the</strong> above pretreatment processes.<br />
• Heap bio-oxidation <strong>of</strong> whole ore or flotation concentrate.<br />
Copper Sulphides – flotation followed by smelt<strong>in</strong>g, roast<strong>in</strong>g or<br />
hydromet treatment <strong>of</strong> concentrate.<br />
Non-Sulphide Gangue M<strong>in</strong>erals – f<strong>in</strong>e gr<strong>in</strong>d<strong>in</strong>g <strong>of</strong> whole ore<br />
followed by direct cyanidation.<br />
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