Twin Lakes West

The Twin Lakes West is a zinc, lead, and 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: Twin Lakes West

Commodity

Primary: Zinc
Primary: Lead
Primary: Copper

Location

State: Alaska
District: Bristol Bay

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 Text: The volcanic rocks have undergone epidote and chlorite alteration, silicification, and lesser sericitization.

Rocks

Role: Host
Age Type: Host Rock
Age in Years: 59.450000+-3.250000
Age Young: Paleocene

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Galena
Ore: Hematite
Gangue: Calcite
Gangue: Chlorite
Gangue: Epidote

Comments

Comment (Geology): Age = The volcanic rocks that host the mineralization have potassium-argon ages that range from 56.2 to 62.7 m.y. (Eakins and others, 1978).

Comment (Deposit): Other Comments = Site is in Lake Clark National Park and Preserve.

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

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Nelson and others, 1985

Comment (Reserve-Resource): Reserves = No reserves

Comment (Geology): Geologic Description = Mineralization occurs as fine-grained disseminations and hairline fracture fillings of pyrite and lesser chalcopyrite, sphalerite, and galena in silicified rhyolite and rhyolite-dacite volcanic rocks and breccias (Nelson and others, 1983). Resource Associates of Alaska (1976) considered the setting as a possible volcanic vent center. These rocks have undergone epidote and chlorite alteration, silicification, and lesser sericitization. The volcanic rocks have potassium-argon ages that range from 56.2 to 62.7 m.y. (Eakins and others, 1978).

Comment (Production): Production Notes = No production

References

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Eakins, G.R., Gilbert W.G., and Buntzen, T.K., 1978, Preliminary bedrock geology and mineral resource potential of west-central Lake Clark quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 118, 15 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.

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: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.

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: U.S. Geological Survey Open-File Report 81-1343-B, 20 p.

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