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Unnamed (upper Granite Creek)

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Au; Mo
Ore minerals chalcopyrite; molybdenite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.9
Longitude -144.08
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is at an elevation of about 5,000 feet in a major west-flowing tributary to upper Granite Creek . It is listed as an unnamed prospect by Cobb (1979 [OF 79-1247]). The prospect is near the creek and approximately on the boundary between sections 15 and 16, T. 13 N., R. 7 E., Copper River Meridian. It was listed as locality 9 by both Richter and Matson (1972) and MacKevett and Holloway (1977).

Geologic setting

Geologic description

The prospect is one of several in or near the western contact zone of a Jurassic diorite to quartz-diorite batholith (Richter and Matsen, 1968; Richter, Lanphere, and Matson, 1975). Stream sediments collected from this zone (area 1, WGM Inc., 1980) were moderately anomalous in gold over a distance of about fifteen miles. According to Kirk Stanley (written communication 2000), chalcopyrite and molybdenite commonly occur along joint surfaces in silica-carbonate rock, which is widely developed near the western contact of the Jurassic pluton. No specific information is known about the prospect.
Geologic map unit (-144.082209163507, 62.899612065383)
Mineral deposit model Porphyry Cu-Mo? (Cox and Singer, 1986; model 21a?).
Mineral deposit model number 21a?
Age of mineralization Probably coeval with a Jurassic diorite to quartz-diorite complex.

Production and reserves

Workings or exploration The prospect was briefly described to Richter in 1969 by Kirk Stanley. It is probably in or near upper Granite Creek as described by Stanley in a letter to Ahtna Minerals Corporation (written communication, 2000).
Indication of production None

Additional comments

Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

References

MRDS Number A011849

References

Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Richter, D.H., and Matson, N.A., Jr., 1968, Distribution of gold and some base metals in the Slana area, eastern Alaska Range, Alaska: U.S. Geological Survey Circular 593, 20 p.
Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.
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.
WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., map, scale 1:63,360. (Report held by Ahtna Mineral Co., Anchorage, Alaska).
Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)
Last report date 12/6/2000