Green Butte

The Green Butte 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: Green Butte

Commodity

Primary: Copper
Primary: Silver

Location

State: Alaska
District: Nizina

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Basaltic Cu (BC name is Volcanic redbed Cu)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Greenstone
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Triassic

Name: Greenstone
Role: Associated
Age Type: Host Rock
Age Young: Late Triassic

Name: Greenstone
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Triassic

Name: Greenstone
Role: Associated
Age Type: Associated Rock
Age Young: Late Triassic

Analytical Data

Not available

Materials

Ore: Malachite
Ore: Covellite
Ore: Chalcocite
Ore: Bornite
Ore: Azurite
Gangue: Dolomite
Gangue: Calcite

Comments

Comment (Workings): Workings / Exploration = About 11,000 ft of drifts and crosscuts on 8 levels, 1,500 ft of inclines and 2,500 ft of raises, winzes and stopes. In 1943, 500 ft level and lower levels were flooded and considerable portions of 100 ft and 400 ft levels caved.

Comment (Deposit): Model Name = Basaltic Cu

Comment (Geology): Geologic Description = Veinlike replacement lodes and cavity fillings forming discontinuous masses of chalcocite and other copper minerals up to 4 ft thick in lower part of Triassic Chitistone Limestone, near contact with underlying Triassic Nikolai Greenstone, which is separated from limestone by a thin bed of shale.

Comment (Reference): Primary Reference = Miller, 1946

Comment (Production): Production Notes = Reported to have produced about 1,500 tons of high-grade ore that contained about 1,200 pounds of copper and 10 ounces of silver per ton.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

Reference (Deposit): Miller, D.J., 1946, Copper deposits of the Nizina district, Alaska: U.S. Geological Survey Bulletin 947F, p. 93-120.

Reference (Deposit): MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, scale 1:250,000.

Reference (Deposit): MacKevett, E.M., Jr., 1974, Geologic map of the McCarthy B-5 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1146, scale 1:63,360.

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