Bedrock Gulch Mine, Innoko District, Yukon-Koyukuk Borough, Alaska, USA

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Location: Bedrock Gulch, about 7.5 miles south-southeast of Ophir, is a short, north tributary to Dollar Creek, which is an east tributary to Beaver Creek. Bedrock Gulch is not named on U.S. Geological Survey topographic maps; most of it is in sec. 20, T. 28 S., R. 12 E., Kateel River Meridian. This site is location 10 of Cobb (1972 [MF 367]). The location is accurate within 1/2 mile.
Geology: The area of Bedrock Gulch is underlain by undivided clastic rocks (Chapman and others, 1987). The thickness of pay gravel in the 1950's was 3-4 feet, and it was covered by 7 to 8 feet of muck and overburden. Saunders (1960) noted that Mr. Lindquist, the operator, expected to finish placer mining that area in 1959 and then move 3 or 4 miles downstream and continue mining. Smith (1937) reports active non-dredge mining along Bedrock Gulch in 1935. The next report of mining is in 1959 (Saunders, 1960).
Workings: Smith (1937) reports non-dredge mining along Bedrock Gulch in 1935. The next mention of mining is in 1959, when Saunders (1960) reports that Hjalmar Lindquist was mining the upper portion of the gulch with a TD-14 tractor. Mr. Lindquist expected to finish mining that area in 1959 and then move 3 or 4 miles downstream and continue mining.
Age: Quaternary.

Commodities (Major) - Au
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. Chapman, R.M., Patton, W.W., and Moll, E.J., 1985, Reconnaissance geologic map of the Ophir quadrangle, Alaska: U.S. Geological Survey Open-File Report 85-203, 19 p., 1 sheet, scale 1:250,000. Cobb, E.H., 1972, Metallic mineral resources map of the Ophir quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-367, 1 sheet, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p. Saunders, R.H., 1960, Itinerary report on a trip to the Flat and Ophir Districts: Alaska Territorial Department of Mines Itinerary Report 64-2, 15 p. Smith, P.S., 1937, Mineral industry of Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-95.

Mineral List

Gold

1 entry listed. 1 valid mineral.