Lowell, J.D., 1970, Copper resources in 1970: American Institute of Mining, Metallurgical, and Petroleum Engineers, Society of Mining Engineers, Transactions, v. 247, p. 97-103.
Lowell, J.D.
American Institute of Mining, Metallurgical, and Petroleum Engineers, Society of Mining Engineers, Transactions, v. 247, p. 97-103.
Porphyry Copper, History, Production, Exploration,