Unnamed (near Coal Creek)

The Unnamed (near Coal Creek) is a tin 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 (near Coal Creek)
Secondary: Coal Creek

Commodity

Primary: Tin
Secondary: Silver
Secondary: Molybdenum
Secondary: Zinc
Secondary: Tungsten
Secondary: Gold
Secondary: Copper

Location

State: Alaska
District: Valdez Creek

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: Porphyry Sn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Sericitic alteration; alteration of granite to tourmaline, quartz, topaz (greisen)

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Sphalerite
Ore: Silver
Ore: Pyrrhotite
Ore: Pyrite
Ore: Fluorite
Ore: Cassiterite
Gangue: Quartz
Gangue: Sericite
Gangue: Topaz
Gangue: Tourmaline

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Type of workings: Surface exploration and drilling.

Comment (Reference): Primary Reference = Reed, 1978

Comment (Deposit): Other Comments = 200-2000 ppm Sn, 2.9-4.3 oz/ton Ag (Reed, 1978); up to 65 ppm Ag, 0.5 ppm Au, 328 ppm Pb, 720 ppm W, and >1.0% Zn in analyses of selected rock samples (Balen, 1990).

Comment (Geology): Geologic Description = Host rock is alaskite (albite granite) of Tertiary age. Sulfides and cassiterite occur as disseminated grains and in greisen veinlets and stockworks in the granite. Fluorite occurs in veins in the granite as well. Thin sections indicate the granite in the zones of stockworks and veins has undergone several episodes of hydrothermal brecciation "&" alteration.

Comment (Deposit): Model Name = Porphyry tin (Cox and Singer, 1986; model 20a)

Comment (Geology): Age = Tertiary

References

Reference (Deposit): Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p.

Reference (Deposit): Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected nonmetalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-588-Q, 33 p., 1 plate, scale 1:250,000.

Reference (Deposit): Reed, B.L., 1978, A disseminated tin occurrence near Coal Creek, Talkeetna Mountains D-6 quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-77, 8 p.

Reference (Deposit): Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 20 p., 1 plate, scale 1:250,000.

Reference (Deposit): Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1992, Mineral investigations in the Valdez Creek mining district, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 659 p., 2 plates, scale 1:250,000.

Reference (Deposit): Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.

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