Unnamed (upper Chilligan River)

The Unnamed (upper Chilligan River) is a tin, lead, zinc, 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: Unnamed (upper Chilligan River)

Commodity

Primary: Tin
Primary: Lead
Primary: Zinc
Primary: Copper
Primary: Silver

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Silicification? and sericite-pyrite replacement?

Rocks

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

Analytical Data

Not available

Materials

Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Quartz
Gangue: Sericite

Comments

Comment (Workings): Workings / Exploration = Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).

Comment (Reference): Primary Reference = Reed and Elliott, 1970

Comment (Geology): Geologic Description = Reed and Elliott (1970) reported that float in a medial moraine at this locality consists of silicified and sericitized quartz monzonite that contains 5 to 10 percent galena, sphalerite, and pyrite. The sulfide minerals are in clots as much as 2 cm in diameter and in thin veinlets up to 5 mm wide. Shear zones in nearby metasedimentary rocks contain galena and sphalerite. Sulfide-bearing samples contain up to greater than 20,000 ppm lead, greater than 10,000 ppm zinc, greater than 1,000 ppm tin, 2,000 ppm copper, and 150 ppm silver. The mineralization is near the contact between a Tertiary granitic pluton and Mesozoic metamorphic rocks.

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

Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986, model 22c)

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Tertiary. Mineralization occurs in Tertiary intrusive rocks and in shear zones in nearby metasedimentary rocks.

References

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Lime Hills quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-412, 1 sheet, scale 1:250,000.

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): Reed, B.L., and Elliott, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-File Report 70-217, 145 p., 1 sheet, scale 1:250,000. (Also published as U.S. Geological Survey Open-File Report 413).

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.

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