Monitoring gold recovery by sampling a carbon-in-leach plant

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Abstract
Efficient processing of gold from generally low-grade ore integrates the deportment of gold into appropriate process design and, during operation of a Carbon-In-Leach (CIL) plant, control of ore fed to the plant, the passage of slurry and activated carbon through the plant, and the dosage of cyanide. A sampling campaign in an operating CIL plant shows that, despite variability in head grade and sampling uncertainty, the recovery of gold is well over 90 %. This process resilience is achieved through a fit-for-purpose process design, a relatively long residence time, and excess of cyanide. Process optimisation requires careful consideration to avoid loss of gold to tailings.

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