The Gold Fields of South Africa, Ltd, Gold Medal and Premium The best paper published 1991 in the Transactions of The Institution of Mining and Metallurgy, London, UK,

A. Jokilaakso, R. Suominen, P. Taskinen, K. Lilius: Oxidation of chalcopyrite in simulated suspension smelting. Trans. Inst.Min.Metall. (Sec. C: Mineral Process. Extr. Metall.), 100, May-Aug. 1991, C79- C90.