Red Mountain

Porphyry copper deposit in Arizona, United States

Names and other identifiers

Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -110.72, 31.49
Geologic map unit -110.72, 31.49
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 60Ma
Age determination method unknown
Age range 62–58 Ma
Age reference Singer and others (2008)
Minerals alunite, anhydrite/gypsum, apatite, biotite, bornite, chalcocite, chalcopyrite, chlorite, covellite, enargite, epidote, galena, hematite/specularite, kaolinite/illite, magnetite, molybdenite, pyrite, sericite, sphalerite, tetrahedrite/tennantite
Associated rocks breccia, hornfels, monzonite porphyry, quartz monzonite porphyry, conglomerate, dacite tuff, rhyolite tuff, andesite, andesite tuff, felsite, latite, siltstone, trachyandesite
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 570Mt
Cu grade (%) 0.63%
Ag grade (g/t) 0.6g/t
Contained copper 3,600,000t
Gold-Moly ratio -9999

Reference information

Comments Chalcocite blanket: 1.7 by 0.3 km.
Study area name United States
References Bodnar and Bean (1980); Corn (1975); Long (1995); Quinlan (1986); Titley (1993); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Bodnar, R.J., and Bean, R.E., 1980, Temporal and spatial variations in hydrothermal characteristics during vein filling in preore cover overlying deeply buried porphyry copper-type mineralization at Red Mountain, Arizona: Economic Geology, v. 75, p. 876–893. (Also available at, R.M., 1975, Alteration-mineralization zoning, Red Mountain, Arizona: Economic Geology, v. 70, p. 1437–1447. (Also available at
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.
Quinlan, J.L., 1986, Geology and silicate-alteration zoning at the Red Mountain porphyry copper deposit, Santa Cruz County, Arizona, in Beatty, Barbara, and Wilkinson, P.A.K., eds., Frontiers in geology and ore deposits of Arizona and the southwest: Arizona Geological Society Digest 16, p. 294–305.
Singer, 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
Titley, S.R., 1993, Characteristics of porphyry copper occurrence in the American Southwest, in Kirkham, R.V., Sinclair, W.D., Thorpe, R.I., and Duke, J.M., eds., Mineral deposit modeling: Geological Association of Canada Special Paper 40, p. 433–464.