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Bagdad

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

Names and other identifiers

GMRAP ID 55
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -113.211944444, 34.585833333
Geologic map unit -113.211944444, 34.585833333
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 71.8Ma
Age determination method Re-Os
Age range 71.8 ±0.2 Ma
Age reference Singer and others (2008)
Minerals albite, apatite, azurite/malachite, barite, biotite, bornite, chalcanthite, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, covellite, cuprite, enargite, galena, gypsum, jarosite, kaolinite, magnetite, molybdenite, montmorillonite, pyrite, rutile, sericite, sphalerite
Associated rocks aplite, breccia, diorite porphyry, quartz monzonite, quartz monzonite porphyry, alaskite porphyry, basalt, conglomerate, granite, rhyolite tuff, schist
Tectonic setting continental margin
Stratigraphic age Late Cretaceous

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 1,600Mt
Cu grade (%) 0.4%
Mo grade (%) 0.01%
Au grade (g/t) 0.0011g/t
Ag grade (g/t) 0.97g/t
Contained copper 6,000,000t
Gold-Moly ratio 0.1

Reference information

Comments Exposed.
Study area name United States
References Anderson and others (1955); Barra and others (2003); Bouse and others (1999); Lang and Titley (1998); Long (1995); McCandless and Ruiz (1993); Titley (1993); Singer and others (2008); Singer and others (2005)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Anderson, C.A., Scholz, E.A., and Strobell, J.D., Jr., 1955, Geology and ore deposits of the Bagdad area, Yavapai County, Arizona: U.S. Geological Survey Professional Paper 278, 103 p. (Also available at http://pubs.usgs.gov/pp/0278/.)Barra, Fernando; Ruiz, Joaquin; Mathur, Ryan; and Titley, Spencer, 2003, A Re-Os study of sulfide minerals from the Bagdad porphyry Cu-Mo deposit, northern Arizona, USA: Mineralium Deposita, v. 38, p. 585–596. (Also available at http://dx.doi.org/10.1007/s00126-002-0341-0.)Bouse, R.M., Ruiz, Joaquin, Titley, S.R., Tosdal, R.M., and Wooden, J.L., 1999, Lead isotope compositions of Late Cretaceous and early Tertiary igneous rocks and sulfide minerals in Arizona—Implications for the sources of plutons and metals in porphyry copper deposits: Economic Geology, v. 94, p. 211–244. (Also available at http://dx.doi.org/10.2113/gsecongeo.94.2.211.)Lang, J.R., and Titley, S.R., 1998, Isotopic and geochemical characteristics of Laramide magmatic systems in Arizona and implications for the genesis of porphyry copper deposits: Economic Geology, v. 93, p. 138–170. (Also available at http://dx.doi.org/10.2113/gsecongeo.93.2.138.)
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.
McCandless, T.E., and Ruiz, J., 1993, Rhenium-osmium evidence for regional mineralization in southwestern North America: Science, v. 261, p. 1282–1286. (Also available at http://www.mccgeoscience.com/public_html/PDFs/mccandless%20ruiz%201993.pdf.)Singer, D.A., Berger, V.I., and Moring, B.C., 2005, Porphyry copper deposits of the world—Database, map, and grade and tonnage models: U.S. Geological Survey Open-file Report 2005-1060, [9] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2005/1060/.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., 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.