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: 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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