Bearpaw Mountain

The Bearpaw Mountain is a tin mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Bearpaw Mountain

Commodity

Primary: Tin

Location

State: Alaska
District: Kantishna

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Gangue: Quartz

Comments

Comment (Geology): Geologic Description = Bearpaw Mountain is composed of a two-mica granite stock (Doyon, Limited, 1998) intruding hornfelsed shale, schist, and siltstone (Bond, 1985). The shale, schist, and siltstone are of Ordovician to Silurian age, and the granite is Cretaceous to Tertiary (Chapman and Yeend, 1981). The granite outcrops on the west flank of Bearpaw Mountain cover approximately 2 square miles. The granite is coarse grained, vuggy, and cut in many places by numerous tourmaline-bearing aplite dikes. The granite is interpreted to be similar to tin granites in the Seward Peninsula (Bond, 1985). Regionally, the area contains a system of northeast-trending strike-slip and related conjugate faults, associated with Cretaceous to Tertiary plutonic rocks and coeval or younger volcanic rocks (Clautice and others, 1993). The prospects consist of vein and stockwork quartz in hornfels adjacent to the granite. As much as 1 percent limonitic voids and rare, blue-gray sulfide wisps are found in the quartz. Limited sampling identified quartz veins with as much as 15 ppm Sn (Bond, 1985). Limited outcrop suggests detrital tin placers and other tin bearing zones may be found with the granite (Bond, 1985). A regional stream sediment sampling and mapping program in 1975-77 and 1980 identified geochemical anomalies (Bond, 1985). In 1981, an airborne radiometric survey was conducted. In 1985, exploration consisted of mapping and collecting 12 rock chip samples (Bond, 1985). There are no indications of production.

Comment (Geology): Age = Veins are syn- or post-Cretaceous to Tertiary intrusion.

Comment (Production): Production Notes = There are no indications of production.

Comment (Reference): Primary Reference = Bond, 1985

Comment (Workings): Workings / Exploration = A regional stream sediment sampling and mapping program in 1975-77 and 1980 identified geochemical anomalies (Bond, 1985). In 1981, an airborne radiometric survey was conducted. In 1985, exploration consisted of mapping and collecting 12 rock chip samples (Bond, 1985).

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Plutonic-related mesothermal veining.

Comment (Deposit): Other Comments = the Bearpaw Mountain prospects are located on land selected by or conveyed to Doyon, Limited. For more information, contact Doyon, Limited.

References

Reference (Deposit): Chapman, R.M., and Yeend, W., 1981, Geologic reconnaissance of the east half of the Kantishna River quadrangle and adjacent areas, in Albert, N.R.D., and Hudson, T., eds, The United States Geological Survey in Alaska, Accomplishments during 1979: U.S. Geological Survey Circular 823-B, 149 p.

Reference (Deposit): Cobb, E.H., 1977, Placer deposit map of central Alaska: U.S. Geological Survey Open-File Report 77-168B, 64 p., 1 map, scale 1:1,000,000.

Reference (Deposit): Cobb, E.H., and Chapman, R.M., 1981, Mineral occurrences (other than mineral fuels and construction materials) in the Kantishna River and Ruby quadrangles, Alaska: U.S. Geological Survey Open-File Report 81-170, 94 p.

Reference (Deposit): Doyon, Limited, 1998, Block 9, Upper Kuskokwim, annual report: Doyon, Limited Report, 274 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)

Reference (Deposit): Eakin, H.M., 1918, The Cosna-Nowitna region, Alaska: U.S. Geological Survey Bulletin 667, 54 p.

Reference (Deposit): Bond, James, 1985, Geologic field examinations in Doyon Limited, regional selection block 9: Doyon Limited Report 85-19, 179 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).

Reference (Deposit): Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.

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