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Unnamed Occurrence (ARDF - FB130; near Spruce Creek), Bonnifield District, Denali Borough, Alaska, USA

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Location: This unnamed prospect is located in sec. 4, T. 10 S., R. 7 W., Fairbanks Meridian. Although this occurrence is called Spruce Creek, Cobb plotted it at the head of Rex Creek, just west of Spruce Creek. The coordinates reflect Cobb's location; it is unclear if this location is accurate, and this occurrence may be a mile or more away. The occurrence is locality 38 of Cobb (1972 [MF 410]).
Geology: Bedrock in the area is gray quartz-orthoclase-sericite schist and augen gneiss of the California Creek Member of the Totalanika Schist (Wahrhaftig, 1970 [GQ-810]). Berg and Cobb (1967, p. 202-203) reported a few gold-bearing lodes and small jamesonite-bearing veins. Samples from an antimony-bearing vein contained 0.44 ounce of gold per ton and 5.4 ounces of silver per ton (Joesting, 1943 [ATDM Pamph. 2, p. 14]).
Workings: The only work that has been reported is hand samples taken of a vein for assay (Joesting, 1943 [ATDM 2, p. 14]).

Commodities (Major) - Au; (Minor) - Ag, Pb, Sb
Development Status: None
Deposit Model: Gold- and antimony-bearing veins in quartz-orthoclase-sericite schist.

Mineral List



4 entries listed. 4 valid minerals.

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References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p. Cobb, E.H., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p. Joesting, H.R., 1943, Strategic mineral occurrences in interior Alaska, supplement to pamphlet no. 1: Alaska Territorial Department of Mines Pamphlet 2, 26 p. Wahrhaftig, Clyde, 1970, Geologic map of the Fairbanks A-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-810, 1 sheet, scale 1:63:360.

 
Mineral and/or Locality  
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