gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.2.313 The Role of Microorganisms in Sulphide Oxidation on Witwatersrand Gold Mines — and Its Inhibition at the Source Ravjee J. Department of Geology, University of the Witwatersrand, PO WITS, 2050, Johannesburg, South Africa, and Economic Geology Research Unit, Geology Department, University of the Witwatersrand, PO WITS, 2050, Johannesburg, South Africa Boer R. H. Reimold W. U. Department of Geology, University of the Witwatersrand, PO WITS, 2050, Johannesburg, South Africa 1998 62A 2 1239 1240 Copyright © 1998, The Mineralogical Society 1998