Unnamed (northwest of Rainbow Basin)

The Unnamed (northwest of Rainbow Basin) is a molybdenum 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 (northwest of Rainbow Basin)

Commodity

Primary: Molybdenum
Secondary: Gold

Location

State: Alaska
District: Bristol Bay Region

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 oxidation.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Geology): Age = Probably Late Cretaceous or Early Tertiary. Mineralization is probably related to the granitic plutons in the area, which are inferred to be part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Kilburn and others, 1992

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

Comment (Deposit): Other Comments = This occurrence is in Wood-Tikchik State Park.

Comment (Geology): Geologic Description = A highly oxidized, Cretaceous or Tertiary granitic stock surrounded by iron-stained argillite hornfels underlies the headwaters of a stream draining south to Rainbow Basin. The occurrence described in this record is about 2 miles northwest of Rainbow Basin (Kilburn and others, 1992). It consits of hornfels that contains disseminated sulfides and is cut by arsenopyrite- and pyrite-bearing quartz veins and stockworks. Individual veins are up to 1/4 inch thick. Thin felsic dikes cut the mineralized veins in places. Float samples of hornfels, silicified hornfels, and sulfide-bearing veinlets collected at the head of the drainage contain up to 1.1 ppm Ag, greater than 3,800 ppm As, 1.35 ppm Au, 400 ppm Bi, 780 ppm Cu, 21 ppm Mo, 303 ppm Ni, 64 ppm Sb, and 20 ppm Sn (Kilburn and others, 1992).

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

References

Reference (Deposit): Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay quadrangle, southwest Alaska, in Bradley, D. C., and Ford, A. B., eds., The U.S. Geological Survey in Alaska, Accomplishments in 1990: U. S. Geological Survey Bulletin 1999, p. 156-162.

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