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Unnamed (southwest flank of Granite Peak)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au; Ba; Mo
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.7425
Longitude -143.8667
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the southwest flank of Granite Peak. It is at an elevation of about 6,200 feet, 1,400 feet south-southwest of Granite Peak, and 2,300 feet northeast of the center of section 36, T. 1 S., R. 8 E. of the Copper River Meridian. This is locality 178 of MacKevett (1976) and locality 3 of MacKevett and others (1978). The location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of numerous pyrite- and chalcopyrite-bearing quartz veinlets and sulfide disseminations in Jurassic granodiorite (MacKevett, 1976). Samples of the mineralization contain as much as 0.1 part per million (ppm) gold, 2 ppm silver, 5,000 ppm copper, 70 ppm molybdenum, more than 5,000 ppm barium, and 100 ppm antimony.
Geologic map unit (-143.868793835332, 61.7420403067154)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17)
Mineral deposit model number 17
Age of mineralization Jurassic or younger based on the age of the granodiorite host rock.
Alteration of deposit The type of alteration is not specified.

Production and reserves

Workings or exploration Only limited surface sampling.
Indication of production None

Additional comments

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

References

MRDS Number A011762

References

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., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003