Casa Grande West

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

Names and other identifiers

GMRAP ID 69
Alternate names Santa Cruz
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -111.880544616, 32.897250182
Geologic map unit -111.880544616, 32.897250182
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 68Ma
Age determination method unknown
Age range 71–65 Ma
Age reference Singer and others (2008)
Minerals atacamite, biotite, bornite, chalcocite, chalcopyrite, chrysocolla, pyrite, sericite
Associated rocks granite, diabase dike, granodiorite porphyry, quartz monzonite porphyry
Tectonic setting continental margin
Stratigraphic age Late Cretaceous–Paleocene

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 1,450Mt
Cu grade (%) 0.588%
Mo grade (%) 0.008%
Au grade (g/t) 0.011g/t
Ag grade (g/t) 0.33g/t
Contained copper 8,530,000t
Gold-Moly ratio 1

Reference information

Comments 100% covered.
Study area name United States
References Kreis (1995); Long (1995); Niemuth (1994); Titley and Anthony (1989); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Kreis, H.G., 1995, Geology of the Santa Cruz porphyry copper deposit, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 364–365.
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.
Niemuth, N.J., 1994, The primary copper industry of Arizona, 1992: Arizona Department of Mines and Mineral Resources Special Report 20, 58 p. (Also available at http://mines.az.gov/DigitalLibrary/ADMMR_Reprints/CopperReports/cu1992SR20.pdf.)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/.
Titley, S.R., and Anthony, E.Y., 1989, Laramide mineral deposits in Arizona, in Jenney, J.P., and Reynolds, S.J., eds., Geologic evolution of Arizona: Tucson, Arizona Geological Society Digest 17, p. 485–514.