Nikolai

The Nikolai 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: Nikolai

Commodity

Primary: Copper

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: Prospect
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

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

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

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

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Bornite
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Pyrite
Gangue: Epidote
Gangue: Calcite

Comments

Comment (Workings): Workings / Exploration = Deposit known to natives in late 1800's. Developed in 1899 by open cuts and more than 100 m underground workings but little work since. Mostly inaccessible by 1943. Surface and underground workings.

Comment (Deposit): Model Name = Vein, replacement, shear zone

Comment (Geology): Geologic Description = Two Cu-bearing veins, each less than 1 m thick, in shear zones in Triassic Nikolai Greenstone about 150 ft below base of Chitistone Limestone and just north of major fault. Veins mainly bornite and chalcopyrite, and minor pyrite, pyrrhotite and secondary Cu and Fe minerals in a quartz-calcite-epidote gangue.

Comment (Reference): Primary Reference = Miller, 1946

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Cretaceous

References

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.

Reference (Deposit): MacKevett, E.M., Jr., and Smith, J.G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p.

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