Morenci-Metcalf

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

Names and other identifiers

GMRAP ID 77
Tract name Southwest Laramide East (003pCu9008)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -109.361111111, 33.103611111
Geologic map unit -109.361111111, 33.103611111
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 56Ma
Age determination method unknown
Age range 56 Ma
Age reference Singer and others (2008)
Minerals azurite/malachite, biotite, brochantite, chalcanthite, chalcocite, chalcopyrite, chlorite, chrysocolla, copper, covellite, cuprite, diopside, epidote, galena, garnet, goethite/limonite, gypsum, hematite, kaolinite, magnetite, molybdenite, montmorillonite, pyrite, sericite, siderite, sphalerite, stibnite, torbernite, wollastonite
Associated rocks aplite, breccia, diabase dikes, granite porphyry, hornfels, quartz monzonite porphyry, skarn, andesite, basalt, conglomerate, granite, granodiorite, quartzite, rhyolite, sandstone, schist, shale, tuff, diorite porphyry, dolomite, limestone, monzonite porphyry
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Producer
Major commodities Cu
Tonnage (Mt) 6,470Mt
Cu grade (%) 0.524%
Mo grade (%) 0.0095%
Au grade (g/t) 0.028g/t
Ag grade (g/t) 1.6g/t
Contained copper 33,900,000t
Gold-Moly ratio 2.9

Reference information

Comments 15% covered.
Study area name United States
References Einaudi (1982); Langton (1973); Long (1995); McCandless and Ruiz (1993); Moolick and Durek (1966); Niemuth (1994); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Einaudi, M.T., 1982, Description of skarns associated with porphyry copper plutons, southwestern North America, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 139–183.
Langton, J.M., 1973, Ore genesis in the Morenci-Metcalf district: Society of Mining Engineers Society Transactions, v. 254, p. 247–257.
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.)
Moolick, R.T., and Durek, J.J., 1966, The Morenci district, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 221–231.
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/.