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  3. Alaska Resource Data File (ARDF)

Unnamed (north of Beaver Creek)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale D-1
Latitude 61.9825
Longitude -141.0879
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the south side of a small, unnamed east tributary to Beaver Creek. It is at an elevation of about 3,700 feet about 2,000 feet west of the center of section 6, T. 2 N., and R. 24 E. of the Copper River Meridian. This is locality 188 of MacKevett (1976).

Geologic setting

Geologic description

The deposit at this prospect consists of pyrite and minor chalcopyrite in veins and as disseminations in granodiorite and in adjacent hornfels roof pendants (Moffit and Knopf, 1910; MacKevett, 1976). The prospect is on the south side of a prominent shear zone that trends east-west along an unnamed tributary to Beaver Creek (Knaebel, 1970). Bedrock in the area is Jurassic or Cretaceous siliciclastic rocks intruded by Cretaceous granitic rocks (MacKevett, 1978).
Geologic map unit (-141.090021340207, 61.9821718228074)
Age of mineralization Cretaceous? The mineralization appears to be related to the emplacement of Cretaceous granitic rocks.
Alteration of deposit Oxidation. Rusty exposures mark the mineralization (Knaebel, 1970).

Production and reserves

Workings or exploration Probably some minor workings.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011770

References

Knaebel, Jeff, 1970, Geochemical survey and geological reconnaissance of the White River area, south-central Alaska: Alaska Division of Mines and Geology Geochemical Report 21, 60 p., 4 sheets, scale 1:63,360.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., 1978, Geologic map of the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1032, 1 sheet, scale l:250,000.
Moffit, F.H., and Knopf, Adolph, 1910, Mineral resources of the Nabesna-White River district, Alaska, with a section on the Quaternary by S.R. Capps: U.S. Geological Survey Bulletin 417, 64 p.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003