The Unnamed (west of Tarr Inlet) is a copper 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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Unnamed (west of Tarr Inlet) MRDS details
Site Name
Primary: Unnamed (west of Tarr Inlet)
Commodity
Primary: Copper
Secondary: Gold
Secondary: Nickel
Secondary: Cobalt
Location
State: Alaska
District: Juneau
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Hornblendite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Pyrite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Geology): Geologic Description = The area is mostly underlain by granitic rocks of Cretaceous age (Brew and others, 1978). At the mineral locality, a dike of pegmatitic hornblende diorite 6 feet thick cuts heterogenous diorite. In turn, the pegmatitic diorite contains quartz-calcite veins as much as 0.5 foot thick that contain pyrite and chalcopyrite. The veins contain as much as 2000 ppm copper, a trace of gold, and 300 ppm each of cobalt and nickel (MacKevett and others, 1971, table 9, location 62).
Comment (Reference): Primary Reference = MacKevett and others, 1971
Comment (Workings): Workings / Exploration = Surface exposures only. A grab sample of a quartz-calcite vein in pegmatitic diorite contained 2000 ppm Cu, a trace of gold, and 300 ppm each of cobalt and nickel (MacKevett and others, location 62, table 9).
Comment (Deposit): Other Comments = the site is in Glacier Bay National Park and Preserve.
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Cretaceous or younger.
Comment (Deposit): Model Name = Lode associated with an intrusive of intermediate to mafic composition.
References
Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.
Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.
Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.
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