Claire Bear

The Claire Bear is a copper, silver, and cobalt 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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Claire Bear
Secondary: Clair Bear

Commodity

Primary: Copper
Primary: Silver
Primary: Cobalt
Secondary: Nickel
Secondary: Bismuth
Secondary: Gold
Secondary: Antimony
Secondary: Tin

Location

State: Alaska
District: Juneau (Skagway subdistrict)

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic replacement

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrrhotite
Ore: Pyrite
Ore: Chalcopyrite

Comments

Comment (Geology): Geologic Description = According to Still and others (1984), this occurrence is in a roof pendant of slate, limestone, and volcanic rocks in diorite. Bedrock samples of a lens of massive sulfides at a dike-limestone contact, and similar float material, contained up to 56.2 ppm silver, 2,290 ppm copper, 1,070 ppm cobalt, 700 ppm tin, 1,000 ppm arsenic, 1,000 ppm bismuth and 7,000 ppm antimony. Still and others (1991) describe the mineralization as, '..narrow, discontinuous pyrrhotite-pyrite-chalcopyrite lenses in marble within the contact aureole of Early Cretaceous quartz diorite - tonalite.' the mineralization is probably Cretaceous, based on the age of the intrusive (MaKevett and others, 1974; Still and others 1991).

Comment (Reference): Primary Reference = Still and others, 1991

Comment (Geology): Age = Probably Early Cretaceous or younger based on the age of the surrounding diorite (MacKevett and others, 1974; Still and others, 1991).

Comment (Deposit): Model Name = Probably a replacement deposit (Cox and Singer, 1986: model 19a).

Comment (Exploration): Status = Probably inactive

References

Reference (Deposit): Still, J.C., Gilbert, W.G., and Forbes, R.B., 1987, Final report of stream sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska, 1983-1985: U.S. Bureau of Mines Open-File Report 36-87, 35 p., 8 sheets.

Reference (Deposit): Still, J.C., Weir, K.R., Gilbert, W.G., and Redman, E.C., 1984, Stream-sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 173-84, 19 p.

Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.

Reference (Deposit): Gilbert, W.G., and Redman, E.C., 1989, Lode deposits, prospects, and occurrences of the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 17-89, 1 sheet, scale 1:39,600.

Reference (Deposit): Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.

Reference (Deposit): MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p.

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