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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 bornite; chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale B-3
Latitude 62.4242
Longitude -142.3138
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is north of upper Antler Creek; it is at an elevation of about 6,700 feet, about 500 feet south-southwest of peak 7144. The site is in the SE1/4 of section 32, T. 8 N., R. 17 E. of the Copper River Meridian. This is locality 36 of Richter and others (1975). It is located to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of quartz veinlets with minor chalcopyrite, pyrite, and bornite; the veinlets cut hornblende syenodiorite of the Antler Creek pluton (Richter, 1975; 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 (-142.315938730801, 62.4238521899028)
Mineral deposit model Copper-bearing vein
Age of mineralization Mid-Cretaceous. A K/Ar date for the Antler Creek pluton is 105 +/- 2.8 Ma (Richter, Lanphere, and Matson, 1975).
Alteration of deposit Oxidation? Richter (1975) reports that copper staining is commonly present at mineralized occurrences in this area.

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 A011409

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