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Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3419
Alternate names Unnamed (Bruce Hills)
Tract name Southeast Alaska Tertiary (003pCu5005)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -136.341, 58.983
Geologic map unit -136.341, 58.983
Nearby data
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Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Tertiary
Age reference geologic inference
Minerals chalcopyrite, galena, hematite, malachite, molybdenite, molybdite, pyrrhotite, sphalerite
Tectonic setting continental margin
Stratigraphic age Tertiary

Commodity and development information

Development status Prospect
Major commodities Cu, Mo
Minor commodities Ag, Pb, Zn
Gold-Moly ratio -9999

Reference information

Comments Foliated granodiorite that is part of a batholithic mass that underlies much of the northeast part of Glacier Bay National Park and Preserve. A resource exists in the mid 0.0X percent range for copper and low 0.0X range for molybdenum; local zones are of higher grade. K-feldspar occurs as a secondary mineral in and near quartz veins, and the host granodiorite is anomalously rich in K-feldspar, particularly south and east of the deposit. The occurrence of copper and molybdenum in the Bruce Hillswas first reported in 1963. Seven claims were staked in 1967 and the deposit was blanketed by 55 claims in 1969.
Study area name United States
References U.S. Geological Survey (2014a); Kimball and others (1978); Rossman (1963)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A. and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375. (Also available at http://pubs.er.usgs.gov/publication/ofr78494.)Rossman, Darwin, 1963, Geology of the eastern part of the Mount Fairweather quadrangle, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1121-K, p. K1–K57, 2 plates, scales 1:125,000 and 1:63,360. (Also available at http://pubs.usgs.gov/bul/1121k/ and at http://www.dggs.alaska.gov/pubs/id/3627.)U.S. Geological Survey, 2014a, Alaska Resource Data File (ARDF): U.S. Geological Survey database, accessed February 5, 2014, at http://mrdata.usgs.gov/ardf/.