Latitude: 63°9'36"N
Longitude: 149°40'12"W
Location: The Alaska Jupiter prospect is at an elevation of about 3,800 feet, on the north side of a divide between upper Copeland and Long creeks. The map site is in the SW1/4 of sec. 21, T. 20 S., R. 11 W., of the Fairbanks Meridian. The accuracy is of the location is within 1.5 miles. This is location E-26 of Balen (1990: OFR 34-90).
Geology: The country rocks at the Alaska Jupiter prospect include Upper Jurassic to Upper Triassic crystal tuff, argillite, graywacke and chert, and Upper Cretaceous (?) porphyry dikes. The rocks are cut by the Chulitna fault. The deposit is along the fault, and consists of quartz-arsenopyrite veins that cut both the bedded and intrusive rocks. Samples contain gold near the 5 ppb detection limits of the analysis (Balen, 1990: OFR 34-90).
Workings: There has only been surface sampling.
Age: Probably Late Cretaceous or younger.
Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide Au-quartz vein(?) (Cox and Singer, 1986; model 36a)
References
Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.
Mineral List
1 entry listed. 1 valid mineral.
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