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Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3433
Tract name Brooks Range (003pCu5008)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -149.2571, 67.6587
Geologic map unit -149.2571, 67.6587
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 395Ma
Age determination method Pb-Pb
Age range 395.0 Ma, 388.0 Ma, 381.0 Ma (Pb-Pb) (Inferred from ages from the nearby Baby Creek batholith and Horace Mountain plutons.)
Age reference Dillon and others (1996)
Minerals bornite, chalcopyrite, gold(?), pyrite
Tectonic setting mixed
Stratigraphic age Devonian(?)

Commodity and development information

Development status Prospect
Major commodities Ag, Au, Cu
Gold-Moly ratio -9999

Reference information

Comments Discovered in 1967. Located in the Chandalar copper belt. Propylitic alteration of metagranodiorite, with local areas of sericitic to potassic alteration; hornfels and skarn developed in adjacent calcareous rocks. DeYoung (1978) estimated a resource of about 1 million metric tons with an average grade of 5 percent copper. Ventures Resource Corp. (1999) estimated the resource as ""tens of million of tons grading 2 percent to 5 percent copper.
Study area name United States
References U.S. Geological Survey (2014a); DeYoung (1978); Dillon and others (1996); Kurtak and others (2002); Ventures Resource Corporation (1999)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 878-B, 2 sheets, scale 1:250,000. (Also available at http://ngmdb.usgs.gov/Prodesc/proddesc_4079.htm.)Dillon, J.T., Reifenstuhl, R.R., and Harris, G.W., 1996, Geologic map of the Chandalar C-5 quadrangle, southeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 104, 2 sheets, scale 1:63,360. (Also available at http://www.dggs.alaska.gov/pubs/id/2285.)Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: U.S. Bureau of Land Management, Alaska Technical Report 50, 2 vols., 845 p. (Also available at http://www.blm.gov/pgdata/etc/medialib/blm/ak/aktest/tr.Par.21083.File.dat/blm_ak_tr_50_vol_i.pdf and http://www.blm.gov/pgdata/etc/medialib/blm/ak/aktest/tr.Par.21083.File.dat/blm_ak_tr_50_vol_ii.pdf.)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/.
Ventures Resource Corp., 1999, 1999 Annual report: Ventures Resource Corporation, 36 p.