Unnamed (northwest of Takahula River)

The Unnamed (northwest of Takahula River) is a tin and zinc 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Unnamed (northwest of Takahula River)

Commodity

Primary: Tin
Primary: Zinc
Secondary: Bismuth
Secondary: Beryllium
Secondary: Molybdenum

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

Not available

Analytical Data

Not available

Materials

Not available

Comments

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

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

Comment (Geology): Geologic Description = Both occurrences are in or adjacent to Devonian granite near the contact with Paleozoic rocks (Nelson and Grybeck, 1980). The occurrences consist of a grab sample of black phyllite about 100 m from altered granite and several samples of marble, calc-silicate rocks, and gneissic granite. Selected samples contain 200 ppm Be, 30 and 50 ppm Bi, 20 ppm Mo, 100 and 5000 ppm Sn, and 700 ppm Zn. The occurrences are similar to other skarn deposits in the Brooks Range (Newberry and others, 1986).

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

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

Comment (Exploration): Status = Inactive

References

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): 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): 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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