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vol.110 número3The Slags ConferencesA structured approach to the evaluation of the energy requirements of HPGR and SAG mill circuits in hard ore applications índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717
versão impressa ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.110 no.3 Johannesburg Mar. 2010







C. Morley

Fluor Australia Pty Ltd, Perth and presently at Ausenco Minerals, Perth Western Australia




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.



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Morley, C. The Case for High Pressure Grinding Rolls, Proceedings Randol Innovative Metallurgy Forum Perth 2005, (Randol International Ltd, Golden, Colorado). pp 15-30.         [ Links ]

Morley, C. Flowsheets for HPGR, Proceedings 4th International Conference on Autogenous and Semi-Autogenous Grinding Technology, Allan, Major, Flintoff, Klein and Mular (eds.), Department of Mining Engineering, University of British Columbia, Vancouver. vol. iv, 2006. pp. 172-189.         [ Links ]

Thompsen, L. Operational performance of grinding rolls at Cyprus Sierrita, Comminution Practices 1996, Chapter 15.         [ Links ]

Thompsen, L, Patzelt, N. and Knecht, J. High-pressure grinding for copper at Cyprus Sierrita, Minerals Engineering 23-26, September 1996.         [ Links ]

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