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Halibut Bay 15G

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Ni
Other commodities Cr
Ore minerals chalcopyrite; chromite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale KR
Quadrangle map, 1:63,360-scale B-2
Latitude 57.357
Longitude -154.595
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is located 4.8 miles north of Anvil Mountain in sec. 33, T. 32 S., R. 33 W., of the Seward Meridian (Foley and Barker, 1985, figure 26, locality 15G; Foley and others, 1989, locality 32). Site location is accurate to within a few hundred feet.

Geologic setting

Geologic description

At this mineral occurrence, one of several within the Halibut Bay ultramafic complex, chalcopyrite and pyrrhotite are present as disseminations in a 3-foot layer of gabbro. The gabbro layer lies between pyroxenite and peridotite. A sample of this material contained 1,700 ppm copper, 420 ppm nickel, 25 ppm cobalt, and traces of gold, silver, platinum, and palladium (Foley and Barker, 1985, table 14).
The Halibut Bay ultramafic complex, consisting mostly of dunite, gabbro, pyroxenite, and peridotite, occurs within sedimentary units of the Uyak formation of Cretaceous age.
Geologic map unit (-154.597328222423, 57.3562743202029)
Mineral deposit model Synorogenic-synvolcanic Ni-Cu (Cox and Singer, 1986; model 7a?)
Mineral deposit model number 7a?

Production and reserves

Workings or exploration A grab sample from this locality contained 1,700 ppm copper, 420 ppm nickel, 25 ppm cobalt, and traces of gold, silver, platinum, and palladium.
Indication of production None

Additional comments

Site is located within Kodiak National Wildlife Refuge.

References

MRDS Number A012475

References

Dahlin, D.C., Kirby, D.E., and Brown, L.L., 1985, Chromite deposits along the Border Ranges fault, southern Alaska; Part 2--Mineralogy and results of beneficiation tests: U.S. Bureau of Mines Information Circular 8991, 37 p.
Foley, J.Y., and Barker, J.C., 1985, Chromite deposits along the Border Ranges fault; Part 1 -- Field investigations and descriptions of chromite deposits: U.S. Bureau of Mines Information Circular 8990, 57 p.
Foley, J.Y., Burns, L.E., Schneider, C.L., and Forbes, R.B., 1989, Preliminary report of platinum group element occurrences in Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 89-20, 32 p., 1 map sheet, scale 1:2,500,000.
Reporters S.H. Pilcher (Anchorage)
Last report date 9/6/1998