Gable Mountain

The Gable Mountain is a copper and silver 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: Gable Mountain

Commodity

Primary: Copper
Primary: Silver
Secondary: Tungsten
Secondary: Molybdenum

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

Role: Host
Age Type: Host Rock
Age Young: Cretaceous

Analytical Data

Not available

Materials

Ore: Chrysocolla
Ore: Malachite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = The deposit must be Cretaceous or younger in age based on the Cretaceous age of the intrusion that hosts it (Brew and others, 1978).

Comment (Geology): Age = Host rock is Cretaceous.

Comment (Deposit): Other Comments = the deposit is within Glacier Bay National Park and Preserve where exploration and development is restricted.

Comment (Deposit): Model Name = There is too little information to assign a model type.

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

Comment (Geology): Geologic Description = The following description is summarized from Brew and others (1978).?At site 1 at an elevation of 4,475 feet, there is a 0.7-foot-wide shear zone which has quartz stringers and copper stains. Below the shear zone there is quartz diorite float that has joint coatings of malachite and chrysocolla. Joint coatings of iron sulfide are reported in quartz diorite at a second site 8,000 - 9,000 feet to the southeast (but the plotted location is about 3,000 - 4,000 feet to the southwest). At site 1, a composite grab sample contained 1,000 ppm copper; a channel sample across the 0.7-foot-wide shear zone contained 250 ppm copper and 7 ppm silver. At Site 2, 7 grab samples contained up to 970 ppm copper, 3 ppm silver, 200 ppm molybdenum, and 150 ppm tungsten. Based on the Cretaceous age of the intrusion (Brew and others, 1978), the mineralization must be Cretaceous or younger in age.

References

Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1967, Mineral resources of Glacier Bay National Monument, Alaska: U. S. Geological Survey Open-File Report 151, 176 p.

Reference (Deposit): Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale approx. 1:600,000.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mt. Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-316, 123 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.

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): 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): 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.

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