Integrated Annual Review 2012 Annual Financial Report 2012 Mineral Resources and Mineral Reserves Regional overview  

5.1.7 Investing in efficient processing

Production at our Tarkwa mine has been supported by the exceptional performance of our Carbon-In-Leach (CIL) processing plant, which achieved recovery rates of up to 97% during 2012. This not only makes it one of the most efficient gold processing plants in the world, but, with 95% availability, also one of the most reliable. In addition, in early 2012, we commissioned a secondary crusher at Tarkwa, which lifted throughput by 5% at our CIL plant from 950,000 t/m to 1,000,000 t/m.

Furthermore, we are in the process of completing a definitive feasibility study for the Tarkwa Expansion Project Phase 6 (TEP6) initiative, which could supplement cost-effective production capacity to the mine – due to the ability of the new CIL plant to process increasingly hard ore at recovery rates of up to 95% (as opposed to recovery rates for heap leaching of around 52% for these harder types of ore).

At Damang, we have started the planned upgrading of our processing plant, including a partial upgrade of the secondary crushers and refurbishment of our plant steelwork. In addition, we reactivated the mine’s gravity recovery circuit and installed an intensive leach reactor to improve throughput at the plant to 5 million tonnes per year and take the plant’s hard ore recovery from 87% to 89% (close to our targeted 90% recovery rate) by the first half of 2014.

Online information: ASTERTM and BIOX® Proprietary processing technology