Engineering & Mining Journal

APR 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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APRIL 2018 • E&MJ 55 www.e-mj.com HEAP LEACH ery rates and higher total recovery even though the HPGR produces a coarser product than the VSI. "With HPGRs, people are always talking about the energy savings or the recovery," Sauermann said. "With these units, the availability is also very high. After 25 months of operation, the pri- mary jaw crusher and the secondary crusher both required maintenance. The POLYCOM is still using the same set of tires. We expect to change those tires sometime soon." The plant is working on its third lift and then the total stack height will be 190 m. HPGR performance is exceeding expectations, 70%-75% of output pass- ing 1/4-in. The availability of the heap- leach pad has been extremely high. Tarkwa installed its HPGR as a tech- nology demonstration for the final six months of the mining operation, Sauer- mann said. "Four years later, it is still running as they treat old heaps." For years, there has been a lot of ex- citement about the possible use of HP- GRs for heap-leach operations. The bene- fits over conventional crushing technology for heap-leach applications are becoming clear, Sauermann explained, which in- cludes the microcracking effect. The next HPGR advancement for heap leach might be in copper. Intelligent driving of belt conveyor systems The new TurboBelt 500 TPXL Your benefits: • Intelligent speed & torque control • Self-diagnosis & remote services • Easy plant control integration • Up to 98.5% efficiency • Unrivaled Total Cost of Ownership voith.com Golden Queen Mining uses conveyors and radial stackers to heap ore onto the pad.

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