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  3. Alaska Resource Data File (ARDF)

Unnamed (on Divide Creek)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcopyrite; covellite; malachite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale B-1
Latitude 61.3669
Longitude -144.2846
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is in the valley of Divide Creek (Moffit, 1914) at an elevation of about 4,200 feet in the NW1/4 section 11, T. 6 S., R. 6 E., of the Copper River Meridian. This prospect is approximately located, perhaps to within a mile. It is locality 59 of Cobb and Matson (1972) and locality 50 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Moffit (1914, p. 52) reported veins and disseminations of chalcopyrite and bornite in fractured greenstone; covellite and malachite are present in small amounts. The greenstone at this locality is in the Paleozoic Skolai Group (Winkler and others, 1981 [OFR 80-892-A]). The copper mineralization may be related to the regional mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle (MacKevett and others, 1997).
Geologic map unit (-144.286678228271, 61.3664254984676)
Mineral deposit model Thin veins, impregnations, and fracture fillings in greenstone; may be related to Kennecott-type copper deposits (Mackevett and others, 1997)
Age of mineralization The copper mineralization may be related to the mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle to the east (MacKevett and others, 1997). This event is interpreted to have accompanied Late Jurassic or Early Cretaceous deformation and metamorphism (MacKevett and others, 1997, p. 88).

Production and reserves

Workings or exploration One small open cut (Moffit, 1914).
Indication of production None

Additional comments

This prospect is in Wrangell-St. Elias National Park.

References

MRDS Number A011500

References

Cobb, E.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Valdez quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-438, 1 sheet, scale 1:250,000.
MacKevett, E.M., Jr., Cox, D.P., Potter, R.W., III, and Silberman, M.L., 1997, Kennecott-type deposits in the Wrangell Mountains, Alaska--High-grade copper ores near a basalt-limestone contact, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 66-89.
Moffit, F.H., 1914, Geology of the Hanagita-Bremner region, Alaska: U.S. Geological Survey Bulletin 576, 56 p.
Winkler, G.R., Miller, R.J., MacKevett, E.M., Jr., and Holloway, C.D., 1981, Map and summary table describing mineral deposits in the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-B, 2 sheets, scale l:250,000.
Winkler, G.R., Silberman, M.L., Grantz, Arthur, Miller, R.J., and MacKevett, E.M., Jr., 1981, Geologic map and summary geochronology of the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-A, 2 sheets, scale 1:250,000.
Reporters Travis L. Hudson
Last report date 12/14/2001