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Gray, P.M.J. and Bowyer, G.J. et al (eds) (1990). Sulphide deposits―their origin and processing. London: Institution of Mining and Metallurgy, 310pp. 1st. Institute of Mining and Metallurgy.
Viljoen, M.J. and Reimold, W.U. (1999). An Introduction to South Africa’s Geological and Mining Heritage. Mintek.