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Unnamed (near Chamberlain Bay)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Co
Ore minerals chalcopyrite; pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-1
Latitude 60.8735
Longitude -147.1743
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located on the north side of hill 1280 overlooking the valley that separates Growler Bay from Chamberlain Bay. The site is in the NE1/4 section 33, T. 11 S., R. 11 W., of the Copper River Meridian. This is location 191 of Tysdal (1978 [MF-880-A]) and location S-112 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect is hosted in sheared, mafic sheeted dikes of the lower Orca Group of Tertiary age. The mineralization consists of solid streaks of sulfides, mostly pyrrhotite with traces of chalcopyrite and pyrite (Cobb and Tysdal, 1980).
Four chip samples contained from 650 ppm to 1.25 percent copper and from 70 ppm to 0.2 percent cobalt (Jansons and others, 1984). A bulk sample (size unknown) collected by the U.S. Bureau of Mines contained 0.85 percent copper and 0.11 percent cobalt. Workings consist of seven surface trenches totaling 150 feet in length.
Geologic map unit (-147.176347218229, 60.8729667151478)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the occurrence is in mafic sheeted dikes of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Four chip samples contained from 650 ppm to 1.25 percent copper, and from 70 ppm to 0.2 percent cobalt (Jansons and others, 1984). A bulk sample (size unknown) contained 0.85 percent copper and 0.11 percent cobalt. Workings consist of seven surface trenches totaling 150 feet in length.
Indication of production None

References

MRDS Number A010362

References

Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber (Anchorage)
Last report date 1/30/2000