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Safford

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Porphyry copper (Cu-Au) deposit in Arizona, United States

Names and other identifiers

GMRAP ID 80
Alternate names Lone Star
Tract name Southwest Laramide East (003pCu9008)
Included sites Dos Pobres, San Juan
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -109.628261431, 32.946351777
Geologic map unit -109.628261431, 32.946351777
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 48Ma
Age determination method K-Ar
Age range 57–48 Ma
Age reference Langton and Williams (1982); Singer and others (2008)
Minerals actinolite, albite, anhydrite, barite, biotite, bornite, brochantite, chalcanthite, chalcocite, chalcopyrite, chalcotrichite, chlorite, chrysocolla, copper, covellite, cuprite, epidote, fluorite, goethite/limonite, galena, gold, hematite/specularite, jarosite, kaolinite, magnetite, malachite, molybdenite, montmorillonite/ smectite, pyrite, rutile, sericite, sphalerite, tenorite, tellurides/calaverite/hessite/petzite/sylvanite, tetrahedrite, turquoise, zeolite
Associated rocks breccia, granodiorite porphyry, monzonite porphyry, quartz monzonite porphyry, tonalite porphyry, agglomerate, andesite, andesite breccia, basalt, dacite, dacite tuff, granodiorite, latite, quartz diorite, rhyolite, tuff
Tectonic setting continental margin
Stratigraphic age Eocene

Commodity and development information

Development status Producer
Major commodities Cu
Tonnage (Mt) 7,260Mt
Cu grade (%) 0.441%
Mo grade (%) 0.004%
Au grade (g/t) 0.17g/t
Contained copper 32,000,000t
Gold-Moly ratio 40

Reference information

Comments 90% covered.
Study area name United States
References Annual Review (1996); Langton and Williams (1982); Long (1995); Lowell (1989); Robinson and Cook (1966); Williams and Forrester (1995); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Annual Review, 1996, Exploration overview, copper: Mining Engineering, May, p. 50.
Langton, J.M., and Williams, S.A., 1982, Structural, petrological and mineralogical controls for the Dos Pobres orebody, Lone Star mining district, Graham County, Arizona, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 335–352.
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.
Lowell, J.D., 1989, Gold mineralization in porphyry copper deposits discussed: Mining Engineering, v. 41, no. 4, p. 227–231.
Robinson, R.F., and Cook, A., 1966, The Safford copper deposit, Lone Star mining district, Graham County, Arizona, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 250–266.
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 http://pubs.usgs.gov/of/2008/1155/.
Williams, S.A., and Forrester, J.D., 1995, Characteristics of 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. 21–34.