Production costs, porphyry copper mines, western United States, in Jenney, J.P., and Hauck, H.R., eds., Proceedings of the Porphyry Copper Symposium, Tucson, Ariz., March 18-20, 1976

Winters, H.J., Jr., 1978, Production costs, porphyry copper mines, western United States, in Jenney, J.P., and Hauck, H.R., eds., Proceedings of the Porphyry Copper Symposium, Tucson, Ariz., March 18-20, 1976: Arizona Geological Society Digest, v. 11, p. 139-142.