Gunnison

Porphyry copper prospect in Arizona, United States

Names and other identifiers

GMRAP ID 3351
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 http://www.excelsiormining.com/index.php/projects. (Also available at http://www.excelsiormining.com/images/Projects/GunnisonProject/GradeAndTonnageDetails.pdf.)
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.]