West Chilligan

The West Chilligan is a lead, molybdenum, copper, silver, and zinc 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: West Chilligan

Commodity

Primary: Lead
Primary: Molybdenum
Primary: Copper
Primary: Silver
Primary: Zinc

Location

State: Alaska
District: Redoubt

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: Porphyry Cu-Mo

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Argillization and quartz-chlorite veining.

Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

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

Analytical Data

Not available

Materials

Ore: Galena
Ore: Molybdenite
Ore: Pyrite
Ore: Sphalerite
Ore: Chalcopyrite
Gangue: Chlorite
Gangue: Clay
Gangue: Quartz
Gangue: Sericite

Comments

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

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

Comment (Geology): Geologic Description = This occurrence consists mainly of pyrite-filled fractures and of quartz-chlorite veins containing traces of chalcopyrite, galena, and sphalerite in argillized granitic rocks. Disseminated sulfides are present locally, and molybdenite occurs as coarse flakes in some quartz veins. Rock samples contained from 0.1 to 1.6 percent copper (Resource Associates of Alaska, 1976). Geochemical anomalies trend northwest and may be controlled by splays of a regional northwest-southeast fault in Chilligan River valley. The granitic host rocks are small stocks of Tertiary granodiorite that intrude locally mineralized quartz diorite (Cobb and Reed, 1981). The granitic rocks are overlain by barren volcanic rocks.

Comment (Deposit): Other Comments = This occurrence is within Lake Clark National Park.

Comment (Deposit): Model Name = Porphyry Cu-Mo (Cox and Singer, 1986, model 21a)

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Tertiary. Sulfide-bearing quartz veins crosscut Tertiary granitic rocks.

References

Reference (Deposit): Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 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): 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.

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