The Unnamed (at head of tributary to Post River) is a arsenic and lead 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 (at head of tributary to Post River) MRDS details
Site Name
Primary: Unnamed (at head of tributary to Post River)
Commodity
Primary: Arsenic
Primary: Lead
Secondary: Zinc
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Strong ferricrete alteration.
Rocks
Role: Host
Age Type: Host Rock
Age in Years: 37.500000+-
Age Young: Early Eocene
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Galena
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997
Comment (Geology): Age = Chronological age is for Host Rock.
Comment (Geology): Age = Mineralization undated; host pluton is 37.5 Ma (Solie and others, 1991).
Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).
Comment (Geology): Geologic Description = This unnamed occurrence consists of a series of N70W, steeply dipping joints and fractures filled with quartz, pyrite, and euhedral galena grains. Width and strike length of the mineralized area was not determined. Host rock is a medium-grained, phaneritic variant of the Hartman pluton (Bundtzen, Harris, and Gilbert, 1997), which has been dated by K-Ar methods as 37.9 Ma (Solie and others, 1991). A strong ferricrete gossan is associated with the sulfide-bearing stockwork veins. One chip sample of of mineralized stockwork veins contained 500 ppm arsenic, 20 ppb gold, and 340 ppm zinc (Bundtzen, Harris, and Gilbert, 1997). Lead was not analyzed.
Comment (Workings): Workings / Exploration = The reporter visited the site in 1988. One chip sample of mineralized stockwork veins contained 500 ppm arsenic, 20 ppb gold, and 340 ppm zinc. Lead was not analyzed (Bundtzen, Harris, and Gilbert, 1997).
References
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.
Reference (Deposit): Solie, D.N., Bundtzen, T.K., and Gilbert, W.G., 1991, K-Ar ages of igneous rocks in the McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 160, 17 pages, one sheet, 1:250,000 scale.
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