1. I.J. Corrans et al., “The Recovery of Platinum-Group Metals from Ore of the UG-2 Reef in the Bushveld Complex,” XIIth CMMI Congress Johannesburg (Johannesburg: South African Institute of Mining and Metallurgy, 1982), p. 629.
2. C.B. Beath, C.A. Cousins, and R.J. Westwood, “The Exploitation of the Platiniferous Ores of the Bushveld Igneous Complex with Particular Reference to the Rustenburg Platinum Mines,” VIIth CMMI Congress (Johannesburg: South African Institute of Mining and Metallurgy, 1961), p. 221.
3. K.S. Liddell, L.B. McRae, and R.C. Dunne, “Process Routes for Beneficiation of Noble Metals from Merensky and UG-2 Ores,” Extraction Mmetallurgys ’85 (London: IMM, 1985), p. 796.
4. C.F. Vermaak and L.P. Hendriks, “A Review of the Mineralogy of the Merensky Reef, with Specific Reference to New Data on the Precious Metal Mineralogy,” Economic Geology, 71, (1976), p. 1252.
5. J.P.R. deVilliers, H.J. Brynard, and L. Viviers, A Mineralogical Investigation of Ores from the Merensky Reef and Their Flotation Products, Mintek Report No. 1966 (National Institute for Metallurgy, 1978), p. 5