1. UN, 1987,Our Common Future. Report of the World Commission on Environment and Development. A/24/427. 42nd Session of the General Assembly of the UN, 4 August, P 25, 8.
2. Mining in South Africa: a mature industry?
3. Sorensen, P., Baartjes, N., Auchterlonie, A., 2008, Gauteng Long-Term Development Strategy: Trend Theme Paper – Mining. Gauteng Economic Development Agency, 27 October.
4. Wilson, M.G.C. and Anhaeusser, C.R. (Eds), 1998,The Mineral Resources of South Africa: Handbook(Johannesburg: Council for Geoscience), 16, 740 pp.
5. Sorensen, P., 2007. Mine closure costs. Mine Closure and Rehabilitation Conference 2007, Southern Sun Grayston, Sandton, 22-24 May.