Under Section 303 of the Comprehensive Anti-Apartheid Act of 1986 (P.L. 99-440) U.S. imports of products produced, manufactured, marketed, or exported by South African parastatal organizations are prohibited. Strategic and critical minerals that the President has certified to the Congress are essential for the economy or defense, and that are unavilable from reliable and secure suppliers, are exempt from this ban. Section 501(c) of the act, however, introduces additional measures that could be undertaken, including the prohibition of strategic and critical material imports from south africa. To assist the President and the Congress in determining the national implications of such a prohibition, at the request of the Department of State, the direct costs to this nation resulting from a U.S. embargo on South African strategic and critical minerals have been assessed by the Bureau of Mines. The minerals included in this analysis are platinum, palladium, and rhodium of the platinum-group metals; chromium (all forms of contained chromium); manganese (all forms of contained manganese); vanadium; titanium (rutile and rutile substitutes); and cobalt (that is transported through South Africa for export).