The Unnamed (near West Fork of Post River) is a silver, zinc, and copper 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 West Fork of Post River) MRDS details
Site Name
Primary: Unnamed (near West Fork of Post River)
Commodity
Primary: Silver
Primary: Zinc
Primary: Copper
Secondary: Nickel
Location
State: Alaska
District: McGrath
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: Bedded barite
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Sulfides oxidized to free sulfur.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Comments
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = The reporter sampled the occurrence in 1982. Two random chip-channel samples taken across the mineralized zone contained up to 1.37 percent zinc, 0.12 percent copper, 13.6 grams/tonne silver, and 196 ppm nickel.
Comment (Reference): Primary Reference = Bundtzen and others, 1988
Comment (Deposit): Other Comments = See other shale-hosted deposits in McGrath quadrangle such as MG049, MG029, MG051, MG071, MG064, and MG074.
Comment (Geology): Age = Inferred to be Lower Silurian, based on graptolite identifications (Bundtzen and others, 1988).
Comment (Deposit): Model Name = Sedimentary exhalitive lead-zinc(?) (Cox and Singer, 1986; model 31b).
Comment (Geology): Geologic Description = This unnamed occurrence is shale-hosted Ag-Cu-Zn mineralization in the Lower Ordovician-to-Lower Silurian Post River Formation, a unit of the Dillinger subterrane (Bundtzen and others, 1988). Graptolites of the Monograptus spiralus zone were found in the shale at the occurrence. A distinctive yellowish, sulfur bloom occurs in the mineralized zone, which is estimated to be about 2 meters thick. Disseminated pyrite was observed in one outcrop. Although isotopic data is lacking, Bundtzen, Harris, and Gilbert (1997) classified the occurrence as a sedimentary exhalitive lead-zinc deposit. Two random chip-channel samples collected across the zone contained up to 1.37 percent zinc, 0.12 percent copper, 13.6 grams/tonne silver, and 196 ppm nickel.
References
Reference (Deposit): Bundtzen, T.K., Kline, J.T., Smith, T.E., and Albanese, M.D., 1988, Geology of the McGrath A-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 91, 18 p., 1sheet, scale 1:63,360.
Reference (Deposit): Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.
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