The Unnamed (in Terra Cotta Mountains) is a tungsten, gold, arsenic, and antimony 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: Tungsten, Gold, Arsenic, Antimony
Lat, Long: 62.102, -153.39400
Map: View on Google Maps
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Unnamed (in Terra Cotta Mountains) MRDS details
Site Name
Primary: Unnamed (in Terra Cotta Mountains)
Commodity
Primary: Tungsten
Primary: Gold
Primary: Arsenic
Primary: Antimony
Secondary: Cobalt
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: Extensive ferricrete gossan.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Arsenopyrite
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = The reporter sampled the site in 1988 during geologic mapping for the Alaska Division of Geological and Geophysical Surveys (Bundtzen, Harris, and Gilbert, 1997). One sample contained 240 ppb gold, 2,200 ppm arsenic, 880 ppm tungsten, 110 ppm cobalt, and 200 ppm antimony.
Comment (Geology): Geologic Description = This unnamed occurrence is a quartz-sulfide vein swarm in altered dacitic tuffs of the Eocene, Terra Cotta Volcanic Field (Bundtzen, Harris, and Gilbert, 1997). Most of the material is in the form of talus and no exposures of the veins were observed. Some sulfide zones have been transformed into extensive gossan. The extent of the mineralized area was not measured. One sample contained 240 ppb gold, 2,200 ppm arsenic, 880 ppm tungsten, 110 ppm cobalt, and 200 ppm antimony (Bundtzen, Harris, and Gilbert, 1997).
Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997
Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).
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.
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