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Conference Proceedings

World Gold '91, Cairns Qld, April 1991

Conference Proceedings

World Gold '91, Cairns Qld, April 1991

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A Laboratory Study of Gold Recovery from a Low-grade Tailings Dump

A sample of tailings from a local, low grade (less than 2g/t) tailings dump was investigated for gold recovery. The tailings were very fine, with 90 per cent passing 30m and almost 60 per cent passing 10m. Tabling the coarse product from classification using a cyclone proved unsuccessful, with low recoveries being obtained due to high gold losses in the slime streams. Gold recovery by cyanide leaching was quite rapid, with recoveries of 85-90% being obtained in five hours. Lime and cyanide consumptions were 3 g/t and 0.1 kg/t respectively. Gold loading onto carbon was inhbited by the presence of the large amount of fines, so heap and vat leaching should be considered where the gold is recovered from a clear pregnant solution. Settling tests were conducted on tailings. It was observed that the addition of at least 3 kg/t lime or 0.4 kgh nonionic flocculant was necessary to promote settling of the tailings to generate a clear supernatant for gold and water recovery.
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  • Published: 1990
  • PDF Size: 0.162 Mb.
  • Unique ID: P199102001

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