Castle Dome

Porphyry copper deposit in Arizona, United States

Names and other identifiers

Alternate names Pinto Valley
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Included sites Carlota-Cactus
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -110.963403283, 33.413278156
Geologic map unit -110.963403283, 33.413278156
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 59Ma
Age determination method unknown
Age range 59 Ma
Age reference Singer and others (2008)
Minerals adularia, azurite/malachite, barite, biotite, chalcanthite, chalcocite, chalcopyrite, chlorite, copper, covellite, cuprite, epidote, fluorite, gypsum, hematite/specularite, kaolinite, limonite, molybdenite, montmorillonite/smectite, silver, pyrite, sericite, turquoise
Associated rocks breccia, granite porphyry, quartz monzonite porphyry, conglomerate, dacite, diabase, granite, quartz monzonite, diabase, granodiorite, limestone, quartzite, schist
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 1,438Mt
Cu grade (%) 0.33%
Mo grade (%) 0.0055%
Au grade (g/t) 0.034g/t
Ag grade (g/t) 2.2g/t
Contained copper 4,700,000t
Gold-Moly ratio 6.2

Reference information

Comments Exposed.
Study area name United States
References Anonymous (1975); Breitrick and Lenzi (1987); Creasey (1980); Keith and Swann (1996); Long (1995); Parkinson (1991); Peterson and others (1951); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Anonymous, 1975, Pinto Valley—Another major porphyry copper open pit for Arizona: Mining Magazine, v. 133, no. 5, p. 344–351.
Breitrick, R.A., and Lenzi, G.W., 1987, Pinto Valley copper deposit: Arizona Geological Survey Special Paper 5, p. 260–265.
Creasey, S.C., 1980, Chronology of intrusion and deposition of porphyry copper ores, Globe-Miami district, Arizona: Economic Geology, v. 75, p. 830–844. (Also available at
Keith, S.B., and Swann, M.M., 1996, The great Laramide porphyry copper cluster of Arizona, Sonora, and New Mexico—The tectonic setting, petrology, and genesis of a world class porphyry metal cluster, in Coyner, A.R., and Fahey, P.L., eds., Geology and ore deposits of the American Cordillera: Geological Society of Nevada Symposium, Reno/Sparks, Nev., April 10–13, 1995 [Proceedings], v. 3, p. 1667–1747.
Long, K.R., 1995, Production and reserves of Cordilleran (Alaska to Chile) porphyry copper deposits, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 35–68.
Parkinson, G.A., 1991, Geology and mineralization of the Carlota-Cactus copper deposits, Globe-Miami mining district, Gila County, Arizona: Society of Mining Engineers Annual Meeting, Denver, Colo., Abstract and Program, p. 58.
Peterson, N.P., Gilbert, C.M., and Quick, G.L., 1951, Geology and ore deposits of the Castle Dome area, Gila County, Arizona: U.S. Geological Survey Bulletin 971, 134 p., 8 plates, scale 1:6,000. (Also available at and at, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at