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
Elevation:
Commodity: Fluorine-Fluorite, Zinc, Tin
Lat, Long: 67.32, -153.99000
Map: View on Google Maps
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Unnamed (near headwaters of Takahula River) MRDS details
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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