Unnamed (west of Tarr Inlet)

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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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: 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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