Pretorius, C.C., CC Pretorius, Vice President, Geophysics: Anglo Technical Division, Anglo Operations Ltd., Marshalltown, South Africa South Africa; Chunnett, G.K., GK Chunnett, Group Exploration Manager: Anglo Platinum, Marshalltown, South Africa; Chalke, T.W.J., TWJ Chalke, Contract Geophysicist: Anglo Technical Division, Anglo Operations Ltd., Marshalltown, South Africa; Gibson, M., M Gibson, Manager Geosciences: Anglo Technical Division, Anglo Operations Ltd., Marshalltown, South Africa
