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Bear Gulch

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu; Mo
Other commodities Pb; Zn
Ore minerals chalcopyrite; molybdenite

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-5
Latitude 62.2854
Longitude -149.4151
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Bear Gulch prospect is at an elevation of about 2,100 feet on a south tributary of Sheep River, about 5 miles southwest of Rainbow Lake. It is in the NW1/4 sec. 2, T. 25 N., R. 1 W., Seward Meridian. The location is accurate to within a 1/4 mile radius. This is locality 25 of MacKevett and Holloway (1977) and locality 88 of Csejtey and Miller (1978). The BG 1 to 32 claims were staked in the 1970's by Cities Service Minerals Company.

Geologic setting

Geologic description

This prospect consists of chalcopyrite and molybdenite disseminated in altered Tertiary granitic rock near its contact with upper Paleozoic metavolcanic rocks (MacKevett and Holloway, 1977). U.S. Geological Survey rock samples contain up to 15,000 parts per million copper, 150 parts per million molybdenum, 100 parts per million lead, and 130 parts per million zinc (Miller and others, 1978). This prospect has been explored by IP and ground magnetics surveys and one diamond drill hole (Don Stevens, written communication, 2001).
Geologic map unit (-149.417330331567, 62.2848972531495)
Mineral deposit model Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)
Mineral deposit model number 21a
Age of mineralization Probably related to Tertiary granite.
Alteration of deposit The granite reportedly is altered but the type of alteration is not specified (Csejtey and Miller, 1978).

Production and reserves

Workings or exploration This prospect has been explored by IP and ground magnetics surveys and one diamond drill hole (Don Stevens, written communication, 2001). Rock samples collected by U.S. Geological Survey (Miller and others, 1978).
Indication of production None

Additional comments

MAS/MILS number 20760061.

References

MRDS Number A012164

References

Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p.
Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000.
Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
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.
Miller, R.J., Cooley, E.F., O'Leary, R.M., Garmezy, Larry, Csejtey, Bela, Jr., Smith, T.E., and Cleveland, M.N., 1978, Analysis of geochemical samples from the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-1052, 279 p., 3 sheets, scale 1:250,000.
Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected non-metalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-558-Q, 33 p., 1 sheet, scale 1:250,000.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/1/2002