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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CYANIDE AND OXYGEN CONSUMING ORES<br />
Cyanide Soluble Copper M<strong>in</strong>erals<br />
• Provision <strong>of</strong> an optimum safe level <strong>of</strong> free cyanide to maximize<br />
<strong>gold</strong> recovery and m<strong>in</strong>imize copper load<strong>in</strong>g on carbon <strong>in</strong> CIP.<br />
• Use <strong>of</strong> an ion exchange res<strong>in</strong> to selectively extract <strong>gold</strong> over<br />
copper.<br />
• Oxygen sparg<strong>in</strong>g to ma<strong>in</strong>ta<strong>in</strong> adequate oxygen <strong>in</strong> solution.<br />
• Precipitation <strong>of</strong> copper from solution with H 2 S or sodium<br />
hydrosulphide (e.g. SART Process) and recycle <strong>of</strong> cyanide.<br />
• Removal <strong>of</strong> soluble copper by leach<strong>in</strong>g with sulphuric acid for<br />
oxide/hydroxide copper m<strong>in</strong>erals or bio-oxidation for sulphide<br />
copper m<strong>in</strong>erals.<br />
• Removal <strong>of</strong> native copper by gravity.<br />
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