The Unnamed (south of Arrigetch Creek) is a lead, tin, copper, silver, 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
Elevation:
Commodity: Lead, Tin, Copper, Silver, Zinc
Lat, Long: 67.43, -154.02000
Map: View on Google Maps
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Unnamed (south of Arrigetch Creek) MRDS details
Site Name
Primary: Unnamed (south of Arrigetch Creek)
Commodity
Primary: Lead
Primary: Tin
Primary: Copper
Primary: Silver
Primary: Zinc
Secondary: Tungsten
Secondary: Fluorine-Fluorite
Secondary: Bismuth
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: Calc-silicate minerals.
Rocks
Name: Marble
Role: Host
Age Type: Host Rock Unit
Age Young: Late Devonian
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Sphalerite
Gangue: Magnetite
Comments
Comment (Commodity): Gangue = Calc-silicate minerals
Comment (Deposit): Other Comments = Located within Gates of the Arctic National Park.
Comment (Deposit): Model Name = Skarn (Cox and Singer, 1986; model 14b)
Comment (Reference): Primary Reference = Grybeck and Nelson, 1981
Comment (Workings): Workings / Exploration = Sites briefly visited during regional geologic mapping by the USGS in the late 1970s.
Comment (Geology): Age = Devonian; related to the intrusion of Devonian pluton.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = This site consists of three contact-metamorphic (skarn) deposits adjacent to Devonian granite (Grybeck and Nelson, 1981). At one locality several tactite bodies up to 700 m long by 70 m thick at a granite-carbonate contact contain lenses and pods of magnetite, and minor disseminated chalcopyrite, sphalerite and unspecified tungsten minerals. At another locality, heterogeneous contact-metamorphic rocks include fluorite-magnetite rock, quartz-epidote skarn, epidote-garnet skarn and sphalerite-epidote skarn. Selected samples contain up to 150 ppm Ag, 1000 pm Bi, and more than 1 percent each of Sn, Pb, and Zn. A brief reconnaissance of a granite-phyllite contact revealed several tactite pods less than 5 m wide. The most prominent consists of magnetite with copper staining. Grab samples contain up to 1000 ppm each of As, Cu, Sn, and Zn. These occurrences probably are similar in origin to other Devonian contact-metamorphic deposits in nearby areas of the Brooks Range (Newberry and others, 1986).
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.
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