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Poston Butte

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Porphyry copper deposit in Arizona, United States

Names and other identifiers

GMRAP ID 66
Alternate names Florence
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -111.429555982, 33.037685528
Geologic map unit -111.429555982, 33.037685528
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 62Ma
Age determination method unknown
Age range 62 Ma
Age reference Singer and others (2008)
Minerals adularia, allophane, azurite, biotite, bornite, brochantite, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, covellite, cuprite, epidote, galena, halloysite, kaolinite/illite, limonite, magnetite, molybdenite, montmorillonite, pyrite, rutile, sericite, shattuckite, siderite, sphalerite, zeolite
Associated rocks aplite, diabase dike, granodiorite porphyry, quartz monzonite porphyry, conglomerate, gypsum, sandstone, schist, siltstone, andesite, basalt, granite, latite, quartz monzonite
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 726Mt
Cu grade (%) 0.38%
Contained copper 2,800,000t
Gold-Moly ratio -9999

Reference information

Comments 100% covered.
Study area name United States
References Gilmour (1982); Nason and others (1982); Niemuth (1994); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Gilmour, Paul, 1982, Grades and tonnages of porphyry copper deposits, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 7–35.
Nason, P.W., Shaw, A.V., and Aveson, K.D., 1982, Geology of the Poston Butte porphyry copper deposit, Pinal County, Arizona, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 375–385.
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/.