Unnamed (east of Kashoto Glacier)

Site Name

Primary: Unnamed (east of Kashoto Glacier)

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Commodity

Primary: Copper
Secondary: Molybdenum
Secondary: Gold

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Location

State: Alaska
District: Juneau

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Contact metamorphism and formation of hornfels. Sulfidation; abundant secondary iron-staining.

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Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Permian

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

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Analytical Data

Not available

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Materials

Ore: Chalcopyrite
Ore: Pyrite

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Comments

Comment (Exploration): Status = Inactive

Comment (Commodity): Ore Material = 'gray' sulfides

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

Comment (Workings): Workings / Exploration = There are no workings or pits. Two samples of hornfels (Location 77, MacKevett and others, 1971, table 9) contained 300 and 700 ppm copper.

Comment (Geology): Geologic Description = Disseminated pyrite and a trace of chalcopyrite occur in an altered zone several hundred feet thick of biotite hornfels adjacent to a granodiorite intrusion of Cretaceous age (Brew and others, 1978). The altered zone is conspicuously iron stained. The area was not well examined; grab samples contained as much as 700 ppm copper. The U.S. Bureau of Mines (Kimball and others, 1978, location 32, p. C173) reported disseminated pyrite, pyrrhotite and occasional bornite at a location about 0.75 miles north of the probable location of the occurrence. Copper content was less than 200 ppm in two chip samples collected from that area, and the report of bornite may be erroneous.

Comment (Deposit): Other Comments = Only a small part of altered zone was examined, hence there may be richer sites. The U.S. Bureau of Mines party failed to thoroughly examine the occurrence because of attacks by vicious seagulls. The occurrence is in Glacier Bay National Park and Preserve.

Comment (Deposit): Model Name = Disseminated deposit, igneous-affiliated contact metamorphism.

Comment (Commodity): Ore Material = 'gray' sulfides

Comment (Geology): Age = Tertiary.

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References

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.

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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