The successful commissioning of the Cerro Verde project in Peru at the end of 2006 marked the culmination of the efforts of many in the industry over many years to have high pressure grinding roll technology recognized and accepted as a legitimate alternative to the conventional approach to large-scale hard rock comminution circuit design. Other hard-rock projects that have recently adopted HPGR include Freeport (Indonesia), Boddington (Australia) and Amplats Potgietersrus (South Africa).With the increasing acceptance of this technology, the need for technical presentations and articles exhorting the industry to adapt has diminished somewhat, and it is considered appropriate now to shift the emphasis to the provision of information for those considering embracing change.This article endeavours to answer frequently asked questions on the subject of high pressure grinding roll technology, with particular reference to its application in the hard rock minerals processing sector.

C Morley: Fluor Australia Pty Ltd, Perth and presently at Ausenco Minerals, Perth. Western Australia

© The Southern African Institute of Mining and Metallurgy, 2010. SA ISSN 0038–223X/3.00 + 0.00. This paper was selected from the Comminution ’08 Conference, held in the UK on 17–20 June 2008.

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