| Reference | {Reserve-Resource:: METALS SOURCEBOOK, AUGUST 26, 1974}{Reserve-Resource:: MINING JOURNAL, N. PERU COPPER FINDS, MAY 6, 1977, P. 348}{Reserve-Resource:: ENGINEERING AND MINING JOURNAL, JULY 1981, PP. 35, 37.}{Reserve-Resource:: MINERAL FOR EXPORT, 9/89, P.64.} |