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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Oxidised or Low Sulphide Ores<br />
PREG-ROBBING ORES<br />
• Maximization <strong>of</strong> <strong>gold</strong> recovery by gravity plus <strong>in</strong>tensive<br />
cyanidation <strong>of</strong> concentrate.<br />
• Application <strong>of</strong> CIL with high carbon concentration.<br />
• Addition <strong>of</strong> kerosene or o<strong>the</strong>r substance to blanket <strong>the</strong> pregrobb<strong>in</strong>g<br />
material followed by CIL or RIL (not subject to foul<strong>in</strong>g).<br />
• Chlor<strong>in</strong>ation to deactivate <strong>the</strong> carbonaceous material.<br />
• Roast<strong>in</strong>g to burn <strong>of</strong>f <strong>the</strong> carbonaceous material.<br />
Ores with Gold Locked <strong>in</strong> Sulphides<br />
• Roast<strong>in</strong>g <strong>of</strong> whole ore or flotation concentrate to burn <strong>of</strong>f <strong>the</strong><br />
carbonaceous material and oxidize <strong>the</strong> <strong>gold</strong> bear<strong>in</strong>g sulphide .<br />
• Pressure oxidation to deactivate <strong>the</strong> carbonaceous material and<br />
oxidize <strong>the</strong> <strong>gold</strong> bear<strong>in</strong>g sulphide.<br />
• Rejection <strong>of</strong> carbonaceous material <strong>in</strong> flotation circuit if <strong>in</strong>cluded.<br />
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