Superior East

Porphyry copper deposit in Arizona, United States

Names and other identifiers

GMRAP ID 61
Alternate names Pinal Ranch
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status deposit

Geographic location

Country United States
State or province Arizona
Geographic location -111.01913652, 33.32730338
Geologic map unit -111.01913652, 33.32730338
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 60Ma
Age determination method unknown
Age range 62–58 Ma
Age reference Singer and others (2008)
Minerals adularia, anhydrite, ankerite, bornite, chalcocite/digenite, chalcopyrite, chlorite, copper, epidote, galena, hematite/specularite, kaolinite/dickite, magnetite, marcasite, molybdenite, pyrite, rhodochrosite, sericite, sphalerite, talc, tremolite
Associated rocks aplite, breccia, granodiorite, granodiorite porphyry, hornfels, quartz monzonite, quartz monzonite porphyry, quartz porphyry, skarn, rhyolite, andesite, basalt, conglomerate, granite, limestone, marble, quartz latite tuff, schist
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Prospect
Major commodities Cu
Tonnage (Mt) 996Mt
Cu grade (%) 0.498%
Contained copper 4,960,000t
Gold-Moly ratio -9999

Reference information

Comments Hypogene ore grades 1 to 2% Cu. 100% covered by Oligocene- to Miocene-age conglomerate and Miocene-age dacite tuff, 600- to 1,200-m thick.
Study area name United States
References Long and others (1998); Manske and Paul (2002); Sell (1995); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)