A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, for the Degree of Doctor of Philosophy Johannesburg, 1995 / A different class of mesothermal gold deposit at Sabie-Pilgrim’s Rest is described which is probably associated with the Bushveld igneous event in South Africa. Pressure and temperature estimates indicate that the ore-fluids of the Sabie-Pilgrim's Rest Goldfield, which occurs within the early Proterozoic Transvaal Supergroup, were similar to those of mesothermal gold deposits. [Abbreviated abstract. Open document ot view full version]