Unnamed (west head of Hugh Miller Glacier)

The Unnamed (west head of Hugh Miller Glacier) 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 head of Hugh Miller Glacier)

Commodity

Primary: Copper
Secondary: Manganese
Secondary: Iron
Secondary: Silver
Secondary: Gold

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: Skarn Fe
Model Name: Porphyry Cu, skarn-related

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Marble has been converted to pyritic garnet-epidote skarn.

Rocks

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

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

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Pyrite
Gangue: Garnet
Gangue: Epidote

Comments

Comment (Geology): Age = Cretaceous.

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Iron-copper skarn somewhat similar to Cu skarn and Fe skarn (Cox and Singer, 1986; model 18b and 18d).

Comment (Deposit): Other Comments = Cretaceous-aged mineralization of a terrane of Paleozoic age. The area is in Glacier Bay National Park and Preserve.

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

Comment (Workings): Workings / Exploration = There are no mine workings; exposures limited to surface outcrops. Chip samples of pyrite-rich sulfide layers showed > 20 percent iron, from 730 to 1100 ppm copper and trace amounts of silver and gold (Kimball and others, 1978).

Comment (Geology): Geologic Description = The occurrence is in the middle Geickie province of Brew and others (1978). Rocks are mainly hornfels, phyllite, semischist and marble of Paleozoic age which are cut and locally contact metamorphosed by granitic bodies of Cretaceous age. At the mineral locality, pyrite-rich epidote-garnet skarn layers are as much as 3 feet thick. Locally, chalcopyrite and arsenopyrite are present in the skarn. Massive pyrite skarn contains as much as 1100 ppm copper, 1.5 ppm silver, 0.15 ppm gold, 5000 ppm manganese and greater than 20 percent iron (Kimball and others, 1978, p. C248, location 50).

References

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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