Unnamed (near headwaters of Takahula River)

The Unnamed (near headwaters of Takahula River) is a fluorine-fluorite, zinc, and 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 headwaters of Takahula River)

Commodity

Primary: Fluorine-Fluorite
Primary: Zinc
Primary: Tin
Secondary: Tin
Secondary: Bismuth
Secondary: Beryllium
Secondary: Arsenic

Location

State: Alaska
District: Koyukuk

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: Sn skarn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Contact metamorphic.

Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Devonian

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Late Devonian

Analytical Data

Not available

Materials

Ore: Fluorite
Ore: Sphalerite

Comments

Comment (Geology): Age = Devonian; related to the intrusion of Devonian pluton.

Comment (Commodity): Gangue = Calc-silicate minerals

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Skarn (Cox and Singer, 1986; model 14b)

Comment (Reference): Primary Reference = Grybeck and Nelson, 1981

Comment (Deposit): Other Comments = Located within Gates of the Arctic National Park.

Comment (Geology): Geologic Description = This occurrence consists of a skarn deposit in an approximately 1000 x 500 ft. area at the contact of Devonian granite with Paleozoic calcareous rocks (Nelson and Grybeck, 1980). Epidote-garnet, magnetite-quartz-hornblende, and magnetite-hornblende skarns contain erratically distributed sphalerite and fluorite. Analyses of numerous grab samples show as much as 7000 ppm As, and most show 700 to 1000 ppm Be, 100 to 200 ppm Bi, and 500 to 1000 ppm Zn. Sn values range from 500 to more than 1000 ppm Sn, but petrographic examination indicates that the Sn is not present as an oxide or sulfide. This occurrence is one of many skarn deposits adjacent to the Devonian granite and is similar to others elsewhere in the Brooks Range (Newberry and others, 1986).

References

Reference (Deposit): Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.

Reference (Deposit): Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

Reference (Deposit): Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000.

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