1. For a complete description of Kennecott’s Utah Copper Div.’s over-all expansion program, see Journal of Metals, 1966, vol. 18, no. 7, pp. 819–823.
2. John C. Kinnear, Jr.: New Developments in the Large Scale Porphyry Copper Operations of Kennecott Copper; paper presented to the joint meeting of the Minnesota Section, AIME, and the U of Minnesota Mining Symposium, Duluth, Minn., Jan. 11, 1966.
3. S. J. Wallden, S. T. Hendriksson, P. G. Arbstedt, and Th. Mioën: Journal of Metals, 1959, vol. 11, no. 8, pp. 528–534.
4. C. B. Kenahan and D. Schlain: US Bureau of Mines Report of Investigations 5890 (1961).
5. D. W. Agers, J. E. House, R. R. Swanson, and J. L. Brobnick: Mining Engineering, 1964, vol. 17, no. 12, p. 76.