As near-surface oxide orebodies are depleted, mines are having to process deeper sulfide ores that are lower in metal grade and metallurgically more complex. Modern technologies that are simple, cost effective and environmentally sound are required for their extraction. In many cases, bioleaching is the most suitable process.


  • GERICKE, M., PINCHES, A., and VAN ROOYEN, J.V. Bioleaching of a chalcopyrite concentrate using an extremely thermophilic culture. Int. J. Min. Process., vol. 62, 2001. pp. 243–255.
  • MILLER, P.C., RHODES, M.K., WINBY, R., PINCHES, A., and VAN STADEN, P.J. Commercialization of bioleaching for base-metal extraction. Mineral biotechnology: microbial aspects of mineral beneficiation, metal extraction, and environmental control. Kawatra, S. K., and Natarajan, K.A. (eds.). Littleton, SME, 2001. pp. 85–100.
  • PINCHES, A., GERICKE, M., and VAN ROOYEN, J.V. A method of operating a bioleach process with control of redox potential. Patent WO 01/31072 A1: Appl.: 28 October 1999: Acc. 3 May 2001.
  • PINCHES, A., MYBURGH, P.J., and VAN DER MERWE, C. Process for the rapid leaching of chalcopyrite in the absence of catalysts. US Patent 6,277,341: Appl.: 3 March 1997: Acc. 21 August 2001.
  • NYOMBOLO, B.M., NEALE, J.W., and VAN STADEN, P.J. Reply to the comments made by J.M Schaekers and D.W. Dew on the paper ‘Neutralisation of bioleach liquors’. J. S.Afr. Inst. Min. Metall., Mar./Apr. 2001, pp. 105-106.