Granite Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite; gold

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale A-6
Latitude 67.0227
Longitude -149.9687
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,350 feet ft on a major west headwater tributary of Granite Creek that flows through the east half of section 4, T. 25 N., R. 11 W. The location is accurate to within about a mile.

Geologic setting

Geologic description

Little is known about this prospect other than that 5 claims were active in this area from 1967 to 1969 and that a suction dredge was in operation in 1969 (DeYoung, 1978). The rocks in the area are Devonian(?) andesite, diorite, and chert adjacent to a large body of of upper Paleozoic or Mesozoic granitic rock (Brosgé and Reiser, 1964). Kurtak and others (2002) investigated the area. None of their panned concentrates showed gold; a float sample of hornfels had a trace of chalcopyrite and assayed 199 ppm copper.
Geologic map unit (-149.971400959367, 67.0222657916364)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Little is known about this prospect other than that 5 claims were active in this area from 1967 to 1969 and that a suction dredge was in operation in 1969 (DeYoung, 1978).
Indication of production Undetermined
Reserve estimates None.
Production notes Possibly some.

Additional comments

MAS No. 0020310116

References

MRDS Number A012119

References

Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010