Bear Mine

The Bear Mine is a gold 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

Satelite View

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: Bear Mine

Commodity

Primary: Gold
Tertiary: Copper

Location

State: Alaska
District: Juneau/Berner'S Bay

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1895
Year Last Production: 1897
Discovery Year: 1891
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Analytical Data

Analytical Data: NO DATA AVAILABLE

Materials

Ore: Chalcopyrite
Gangue: Quartz
Gangue: Sericite
Gangue: Pyrite
Gangue: Calcite

Comments

Comment (Location): LOCATION OBTAINED FROM UNPUBLISHED MINES AND PROSPECTS MAP; SEE USGS OFR 85-717, NO. J LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Production): 5500 TONS MINED, 1895-1897; ONLY 62% RECOVERY USGS BULL 284, P.32

Comment (Deposit): 2 PYRITE AND CHALCOPYRITE BEARING AURIFEROUS QUARTZ VEINS IN DIORITE; BEAR VEIN: 2-5 FT WIDE, INTERSECTED BY TUNNEL 200 FT BELOW OUTCROP; OTHER VEIN SMALLER; PYRITE AND QUARTZ STRINGERS IN ALTERED WALL ROCK

Comment (Workings): TUNNEL 1100 FT LONG; STOPES ON 3 LEVELS, MAINLY ON BEAR VEIN

Comment (Geology): DEPOSIT IS IN CHLORITZED, EPIDOTIZED DIORITE

Comment (Deposit): SEE ALSO: KENSINGTON, COMET, JOHNSON, EUREKA ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Development): MINED IN 1895-1897; CONSOLIDATED WITH KENSINGTON, 1915

References

Reference (Deposit): USGS 18TH ANNUAL REPORT, PART 3, P. 62-63

Reference (Deposit): USGS BULL 284, P. 32

Reference (Deposit): USGS BULL 446, P. 39-40

Reference (Deposit): USGS BULL 442, P. 77

Reference (Deposit): USGS BULL 1246, P. 160

Reference (Deposit): USGS OFR 85-717, NO. J092

Reference (Other Database): BAG-OFR-85-717-092

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