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Johnson Camp

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Porphyry copper deposit in Arizona, United States

Names and other identifiers

GMRAP ID 92
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Included sites I-10
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -110.065, 32.098611111
Geologic map unit -110.065, 32.098611111
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 53Ma
Age determination method unknown
Age range 53 Ma
Age reference Singer and others (2008)
Minerals aurichalcite, azurite/malachite, biotite, bornite, calcite, chalcopyrite, chlorite, chrysocolla, cuprite, diopside, epidote, fluorite, galena, goethite/limonite, hematite, jarosite, kaolinite, magnetite, molybdenite, montmorillonite, muscovite/sericite, pyrite, scheelite, tenorite, tetrahedrite, tremolite, wolframite
Associated rocks hornfels, quartz monzonite, skarn, conglomerate, diabase, dolomite, limestone, quartzite, schist, shale
Tectonic setting continental margin
Stratigraphic age Eocene

Commodity and development information

Development status Producer
Major commodities Cu
Tonnage (Mt) 250Mt
Cu grade (%) 0.489%
Mo grade (%) 0.011%
Ag grade (g/t) 1.6g/t
Contained copper 1,200,000t
Gold-Moly ratio -9999

Reference information

Comments Exposed.
Study area name United States
References Clayton (1978); Long (1995); Wilkins (1984); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Clayton, R.L., 1978, Alteration and mineralization of the Cyprus Johnson deposit, Cochise County, Arizona, in Jenney, J.P., and Hauck, H.R., eds, Porphyry Copper Symposium, Tucson, Ariz., March 18–20, 1976, Proceedings: Tucson, Arizona Geological Society Digest 11, p. 17–24. (Also available at http://www.arizonageologicalsoc.org/Default.aspx?pageId=1665440 and at http://archives.arizonageologicalsoc.org/digests/AGS_DIG11_S.PDF.)
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.
Wilkins, Joe, Jr., 1984, Distribution of gold- and silver-bearing deposits in the Basin and Range province, western United States, in Wilkins, Joe, Jr., ed., Gold and silver deposits of the Basin and Range province, western U.S.A.: Arizona Geological Society Digest 15, p. 1–27.