FIG. 1. Locations of the Cerro Verde-Santa Rosa, Cuajone, and Toquepala mines and other porphyry copper deposits and prospects of southern Perú and northern Chile cited in the text. Geochronologic data for hypogene mineralization: 1 = Quang et al. (2003); 2 = Clark et al. (1990b), 3 = Clark (2003); 4 = Minera Quellaveco, S.A. (unpub. data), 5 = Zweng and Clark (1995) and Clark (2003); 6 = Quirt et al. (1971), 7 = Bouzari and Clark (2002), 8 = Reynolds et al. (1998); 9 = Ballard et al. (2001), 10 = Rowland and Clark (2001), 11. A.H. Clark, unpublished report to Minera Escondida Ltda. (2001), and 12 = Gustafson et al. (2001).