The Unnamed (near head of Kobuk River) is a tungsten, 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
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Unnamed (near head of Kobuk River) MRDS details
Site Name
Primary: Unnamed (near head of Kobuk River)
Commodity
Primary: Tungsten
Primary: Tin
Primary: Zinc
Secondary: Bismuth
Secondary: Beryllium
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: Calc-silicate minerals.
Rocks
Not available
Analytical Data
Not available
Materials
Not available
Comments
Comment (Reference): Primary Reference = Grybeck and Nelson, 1981
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
Comment (Geology): Age = Devonian; related to the intrusion of Devonian pluton.
Comment (Geology): Geologic Description = The occurrences consist of small skarn deposits adjacent to Devonian granite and Paleozoic metamorphic rocks (Nelson and Grybeck, 1980). Selected float samples contain 200 ppm Be, 200 to 500 ppm Bi, 500 ppm W, 1000 ppm Sn, and 500 to 2000 ppm Zn. The occurrences are similar to other skarn deposits 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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