The Unnamed (on tributary valley to Happy River) is a arsenic and tungsten 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 (on tributary valley to Happy River) MRDS details
Site Name
Primary: Unnamed (on tributary valley to Happy River)
Commodity
Primary: Arsenic
Primary: Tungsten
Secondary: Gold
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: Sericite in intrusion.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).
Comment (Reference): Primary Reference = This description
Comment (Workings): Workings / Exploration = The reporter mapped the pluton as part of a Division of Geological and Geophysical Surveys mapping effort in 1988 (Bundtzen, Harris, and Gilbert, 1997). Three samples taken of sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not analyzed for lead or copper.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = This unnamed occurrence consists of a chalcopyrite-bearing quartz vein in the contact aureole of a small composite hornblende-rich, granodiorite pluton that intrudes Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The undated pluton contains monzonite, granodiorite, and syenite phases with granodiorite predominates. The small intrusion covers an area of 100 meters by 200 meters; however, a 125 meter wide thermal aureole surrounds the intrusion, which suggests an enlarged body at depth. . Chalcopyrite-bearing quartz veins occur in the thermal aureole near the contact with the pluton. Chalcopyrite comprises no more than one percent of the total sulfides, which are dominated by pyrite. Three samples taken of the sulfide-vein mineralization contained an average 180 ppm tungsten, 200 ppm arsenic, and 250 ppm gold. The samples were not run for either lead or copper.
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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