In 2003, NEWMONT MINING CORPORATION, the world's largest gold producer, set out to prove that High Pressure Grinding Roll (HPGR) technology is sufficiently robust and reliable to be considered for the treatment of hard rock gold ores. In collaboration with POLYSIUS, a significant trial was conducted and 127 600 tonnes processed, successfully proving the HPGR capabilities on the Lone Tree Mine, Nevada ore - one of the most competent and abrasive ores in the industry. The success has led a number of mining companies to consider HPGRs for the comminution of gold and copper ores._x000D_
FORMAL CITATION:LeVier, K M, Logan, T C, Patzelt, N and Klymowsky, I B, 2004._x000D_
Latest developments in HPGR technology - results of a field trial, in Proceedings Metallurgical Plant Design and Operating Strategies 2004, pp 55-64 (The Australasian Institute of Mining and Metallurgy: Melbourne).