MAS/MIL number 20760061.
Location: 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.
Geology: 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 commun., 2001).
Workings: This prospect has been explored by IP and ground magnetics surveys and one diamond drill hole (Don Stevens, written commun., 2001). Rock samples collected by U.S. Geological Survey (Miller and others, 1978).
Age: Probably related to Tertiary granite.
Alteration: The granite reportedly is altered but the type of alteration is not specified (Csejtey and Miller, 1978).

Commodities (Major) - Cu, Mo; (Minor) - Pb, Zn
Development Status: None
Deposit Model: Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Copper

ⓘ Lead

ⓘ Zinc

Mineral List

ⓘ Chalcopyrite

ⓘ Molybdenite

2 valid minerals.

Detailed Mineral List:

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Molybdenite

Formula: MoS₂

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Molybdenite	2.EA.30	MoS₂

List of minerals for each chemical element

S	Sulfur
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Molybdenite	MoS₂
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Mo	Molybdenum
Mo	ⓘ Molybdenite	MoS₂

Other Databases

Link to USGS - Alaska:	TK071

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Wrangellia DomainVolcanic Arc

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

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 78-588-Q, 33 p., 1 sheet, scale 1:250,000.

Quick NavTop Commodities Mineral List Other Databases Other Regions References

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 6, 2026 13:42:51 Page updated: August 17, 2025 02:09:23

Go to top of page