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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Site Name

Primary: Unnamed (west of Tarr Inlet)

Commodity

Primary: Copper
Secondary: Zinc
Secondary: Silver

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

Model Name: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Greenish, sericitic alteration reported by MacKevett and others, (1971, table 9).

Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Cretaceous or younger, related to quartz monzonite intrusions.

Comment (Reference): Primary Reference = MacKevett and others, 1971

Comment (Geology): Geologic Description = The country rocks in the area of this occurrence consist of a granitic batholith of Cretaceous age that intrudes volcanic and volcaniclastic strata of Permian age, and an intermediate area of mixed granitic and metamorphic rocks (Brew and others, 1978). ? the mineral occurrence consists of quartz monzonite that is cut by veins and veinlets of quartz which contain pyrite and chalcopyrite. MacKevett and others (1971) reported a grab sample of sericitically altered quartz monzonite contained 1000 ppm copper, 300 ppm zinc, and 1 ppm silver. The ore mineralogy, alteration, and geologic setting suggest that the occurrence is part of a porphyry copper deposit.

Comment (Deposit): Model Name = Porphyry copper (Cox and Singer, 1986; model 17).

Comment (Deposit): Other Comments = the occurrence is in Glacier Bay National Park and Preserve.

Comment (Workings): Workings / Exploration = Surface exposure; one sample (Hx-391, table 9, MacKevett and others, 1971) contained 1000 ppm copper, 1 ppm silver , and 300 ppm zinc).

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.

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