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:: KCGM Increases Gold Recovery
In July 2004, Kalgoorlie Consolidated Gold Mines (KCGM) (a 50/50 joint venture between Barrick and Newmont operated by Barrick) commissioned a gravity circuit consisting of five (5) Knelson KC-XD48 Concentrators and a ConSep ACACIA CS6000 concentrate leach reactor. After more than one full year of operation the circuit has demonstrated improvements at KCGM in excess of initial expectation.
"Following the introduction of the gravity circuit at KCGM, we have seen the benefits of the circuit exceed design expectations. With ConSep and Knelson’s support we have been able to implement a program of continuous improvement in the gravity circuit, which has continued to generate steady mechanical and process performance gains. Overall the project has been a good success for KCGM" stated KCGM’s Danny Hillier.
The 10 - 12 tpd of gravity concentrate generated from the Knelson Concentrators is intensively leached within a CS6000 ConSep ACACIA. The ConSep ACACIA design at KCGM included a new reactor geometry. The reactor was also designed to take up to 12 tpd of gravity concentrate, making it the world’s largest ConSep ACACIA intensive cyanidation circuit at the time it was commissioned. The reactor was also designed specifically enable operation at elevated temperatures during the leach cycle. Test work carried out on the gravity concentrates had revealed that the ideal leach conditions for KCGM were to utilize a combination of leach accelerants and an elevated temperature of 55°C. These conditions maximized the recovery of the difficult to leach gold telluride complex, Calaverite (AuTe2). This species is one of the slowest leaching gold components in KCGM’s ore, and is partially gravity recoverable.
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