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Bear Mine

Past Producer in Alaska, United States with commodities Gold, Copper
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Geologic information

Identification information

Deposit ID 10100967
MRDS ID A012116
Record type Site
Current site name Bear Mine

Geographic coordinates

Geographic coordinates: -135.09623, 58.86308 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • LOCATION OBTAINED FROM UNPUBLISHED MINES AND PROSPECTS MAP; SEE USGS OFR 85-717, NO.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).

Commodities

Commodity Importance
Gold Primary
Copper Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Calcite Gangue
Pyrite Gangue
Quartz Gangue
Sericite Gangue

Analytical data

Result NO DATA AVAILABLE

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Jualin Diorite
    Rock description Jualin Diorite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -135.09623, 58.86308
ListMap

Ore body information

  • Strike N 20 W
    Dip 40-70 E
    Thickness 1.52M
    Depth to bottom 60.96M
    Length 91.44M

Comments on the geologic information

  • DEPOSIT IS IN CHLORITZED, EPIDOTIZED DIORITE

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1891
Year of first production 1895
Year of last production 1897

Mining district

District name Juneau/Berner'S Bay

Land status

Ownership category National Forest

Comments on the production information

  • 5500 TONS MINED, 1895-1897; ONLY 62% RECOVERY USGS BULL 284, P.32

Workings at the site

  • Type of workings Surface/Underground
    Length 335.28M
    Overall depth 60.96M

Comments on the workings information

  • TUNNEL 1100 FT LONG; STOPES ON 3 LEVELS, MAINLY ON BEAR VEIN

Comments on development

  • MINED IN 1895-1897; CONSOLIDATED WITH KENSINGTON, 1915

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012116

Bibliographic references

  • Deposit

    USGS 18TH ANNUAL REPORT, PART 3, P. 62-63

  • Deposit

    USGS BULL 284, P. 32

  • Deposit

    USGS BULL 446, P. 39-40

  • Deposit

    USGS BULL 442, P. 77

  • Deposit

    USGS BULL 1246, P. 160

  • Deposit

    USGS OFR 85-717, NO. J092

  • Other Database

    BAG-OFR-85-717-092

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1985 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey