Unnamed (east of Stony River)

The Unnamed (east of Stony River) 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 (east of Stony River)

Commodity

Primary: Copper
Secondary: Silver

Location

State: Alaska
District: Aniak

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Silicification and epidote replacement.

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

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

Comments

Comment (Geology): Age = Tertiary. Mineralization is in the altered zone around a Tertiary pluton.

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Resource Associates of Alaska, 1976

Comment (Workings): Workings / Exploration = Reconnaissance sampling has been completed in this area.

Comment (Deposit): Model Name = Disseminated sulfides in contact zone of granitic pluton

Comment (Geology): Geologic Description = Cobb and Reed (1981) reported that chalcopyrite, pyrite, and pyrrhotite occur as blebs and disseminations in Cretaceous(?) metasedimentary rocks adjacent to a Tertiary granitic pluton. The mineralization is localized in metasiltstone and metaconglomerate adjacent to and in roof pendants of the quartz diorite to quartz monzonite pluton. The metasedimentary rocks contain blebs and vugs of epidote, quartz, and feldspar. The area is crosscut by a regional northwest-trending fault. A 1,500-foot-diameter gossan containing 20 percent pyrite lies to the north of the occurrence. Rock samples contain as much as 2,700 ppm coppper and 7 ppm silver (Resource Associates of Alaska, 1976).

References

Reference (Deposit): Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, 109 p.

Reference (Deposit): Gamble, B.M., Bailey, E. A., and Reed, B. L., 1989, Gold occurrences near Snowcap Mountain, Lime Hills B-2 quadrangle, Alaska: U.S. Geological Survey Open-File Report 89-0646, 8 p.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

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