Unnamed (on Minnesota Ridge)

The Unnamed (on Minnesota Ridge) 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 (on Minnesota Ridge)

Commodity

Primary: Copper
Secondary: Gold

Location

State: Alaska
District: Juneau (Glacier Bay subdistrict)

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

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The following description is summarized from Brew and others (1978).?The northwest portion of Minnesota Ridge consists of locally iron-stained quartz diorite cut by a few andesite dikes. The iron-stained quartz diorite has small amounts of chalcopyrite smeared along tiny fractures. The highest values obtained from nine samples were 490 ppm copper, 30 ppm molybdenum, 0.10 ppm gold, and 0.7 ppm silver. Based on the age of the host intrusion, the mineralization must be Cretaceous or younger in age.

Comment (Reference): Primary Reference = Brew and others, 1978

Comment (Geology): Age = Based on the age of the host intrusion, the mineralization must be Cretaceous or younger in age (Brew, 1978).

Comment (Deposit): Model Name = There is too little information to adequately characterize this occurrence.

Comment (Deposit): Other Comments = This is a very low grade occurrence. The deposit is within Glacier Bay National Park and Preserve where exploration and development is restricted.

References

Reference (Deposit): Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska; Supplement to Open-File Report 78-316; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-A, 11 p.

Reference (Deposit): Cobb, E.H., 1981, Summaries of data and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska, Supplement to Open-File Report 78-316, Part B in Lists of References to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-B, 10 p.

Reference (Deposit): Cobb, E.H., 1981, Summaries of data and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska, Supplement to Open-File Report 78-316, Part A in Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-A, 11 p.

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): Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska; Supplement to Open-File Report 78-316; Part B, Lists of references to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-B, 10 p.

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.

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