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000 million tonnes 1975 production Aggeneys alloys amosite annum as follows anthophyllite antimony Archaean asbestos associated Australia Bushveld Complex Canada carbonate carbonatite Central Economy Countries chemical chromite chrysotile coal Commodity Type consumption contained copper Cr/Fe crocidolite demonstrated resources Depletion Allowance Domestic deposits dolomites electrical escalated estimated Exploration export figures fluorine fluorspar following countries contributed fuel geochemical geological gold growth rate identified resources igneous increase iron kilograms lead magnetite manganese Market Economy Countries Merensky Reef metallurgical methods metres million kilograms million tonnes mining nickel occur OUTLOOKS Domestic oxide Palabora pegmatites petroleum phosphate phosphate rock placer platinoids Potgietersrus production growth rand reserves and resources seams sedimentary silver South Africa SOUTH AFRICA Sources South African production steel subeconomic sulphide tonnes of metal total production Transvaal TRENDS U.S. demand U.S. Depletion Allowance U.S. Import Sources U.S. Prices uranium Utilization vanadium veins vermiculite world production world reserves world resources WORLD U.S. Depletion zinc