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  3. Alaska Resource Data File (ARDF)

Unnamed (north of upper Antler Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale B-3
Latitude 62.4147
Longitude -142.2998
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the nose of a small, east-trending ridge near the center of section 5, T. 7 N., R. 17 E. of the Copper River Meridian. It is at an elevation of about 5,700 feet, 4,800 feet southeast of peak 7144. This is locality 37 of Richter and others (1975). It is located to within a few hundred feet.

Geologic setting

Geologic description

This occurrence consists of segregations of pyrite and chalcopyrite in the hornblendite, border zone of the Antler Creek pluton (Richter and others, 1975). The Antler Creek pluton is part of a mid-Cretaceous intrusive suite associated with copper skarn and porphyry deposits elsewhere in the Nabesna quadrangle (e.g., NB022 and NB043). A K/Ar date on hornblendite in the border zone of the Antler Creek pluton is 105 +/- 2.8 Ma (Richter, 1975; Richter, Lanphere, and Matson, 1975).
Geologic map unit (-142.301937973852, 62.4143515134062)
Mineral deposit model Chalcopyrite segregations in hornblendite
Age of mineralization Related to Mid-Cretaceous pluton A K/Ar date on hornblendite in the border zone of the Antler Creek pluton is 105 +/- 2.8 Ma (Richter, 1975; Richter, Lanphere, and Matson, 1975).

Production and reserves

Workings or exploration Probably only surface examination.
Indication of production None

Additional comments

The occurrence is in the Wrangell-St. Elias National Preserve.

References

MRDS Number A011410

References

Richter, D.H., 1975, Reconnaissance geologic map of the Nabesna B-3 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-904, 1 sheet, scale 1:63,360.
Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eeastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, 1 sheet, scale 1:250,000.
Reporters Travis L. Hudson (Applied Geology)
Last report date 11/24/2002