Unnamed (west of central Osborn Creek)

The Unnamed (west of central Osborn Creek) is a copper and gold 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 of central Osborn Creek)

Commodity

Primary: Copper
Primary: Gold

Location

State: Alaska
District: Nome

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

Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation of chalcopyrite to secondary copper minerals.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Azurite
Ore: Chalcopyrite
Ore: Gold
Ore: Malachite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Smith, 1908

Comment (Workings): Workings / Exploration = Prospect pits are probably present.

Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).

Comment (Geology): Geologic Description = This deposit consists of a quartz vein containing iron and copper sulfides, inferred to be pyrite and chalcopyrite. The vein is near a contact between schist and greenstone and is reported to have assayed from 0.2 to 2 ounces of gold per ton (Smith, 1908). Copper sulfide oxidation products, inferred to be malachite and azurite, are also present. Bedrock in this area is marble, schist, and local greestone (Hummel, 1962 [MF 247]). The prospect is within about one-half mile of the head of mining activity on Osborn Creek (NM305).

Comment (Geology): Age = Mid-Cretaceous or younger; vein cross cuts schist metamorphosed in the mid-Cretaceous.

References

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.

Reference (Deposit): Smith, P.S., 1908, Investigations of mineral deposits of Seward Peninsula: U.S. Geological Survey Bulletin 345, p. 206-250.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.

Reference (Deposit): Hummel, C.L., 1962, Preliminary geologic map of the Nome C-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-247, 1 sheet, scale 1:63,360.

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