Porphyry copper prospect in Arizona, United States

Names and other identifiers

Alternate names I-10, North Star
Tract name Western Sierra Madre Occidental and Laramide Central (003pCu3007x)
Site status prospect

Geographic location

Country United States
State or province Arizona
Geographic location -110.035221819, 32.083082568
Geologic map unit -110.035221819, 32.083082568
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range ~80–35 Ma (Laramide orogeny)
Age reference geologic inference
Minerals chrysocolla, malachite
Tectonic setting continental margin
Stratigraphic age Late Cretaceous–Paleocene–Eocene

Commodity and development information

Development status Past Producer
Major commodities Cu
Gold-Moly ratio -9999

Reference information

Comments For oxide, mixed, and sulfide ore: indicated resources of 554 million short tons at 0.32% Cu; inferred resources of 200 million short tons at 0.30% Cu (based upon 0.1% Cu cut-off for oxide component and 0.3% cut-off for mixed and sulfide component). Under active exploration and development. Discovered in 1960 and mined as open pit and heap leach until 1985. Scheduled for startup in 2016. Primarily a skarn.
Study area name United States
References Nations and Phillips (1997); Excelsior Mining Corp. (2013)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Excelsior Mining Corp., 2013, Gunnison copper project: Excelsior Mining Corp. Web page, accessed September 26, 2013, at (Also available at
Nations, J.D., and Phillips, Ken, 1997, The mining and minerals cluster in Arizona—An analysis for the strategic economic development vision for the Arizona-Sonora region: Flagstaff, Northern Arizona Uinversity, Bureau of Business and Economic Research, 112 p. [Later published in 2010 as Arizona Department of Mines and Mineral Resources Special Report 27.]