The Post Lake is a cobalt, arsenic, copper, and nickel 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: Cobalt, Arsenic, Copper, Nickel
Lat, Long: 62.121, -153.52500
Map: View on Google Maps
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Post Lake MRDS details
Site Name
Primary: Post Lake
Commodity
Primary: Cobalt
Primary: Arsenic
Primary: Copper
Primary: Nickel
Secondary: Lead
Secondary: Iron
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: Prospect
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: Ferricrete oxidation of massive pyrrhotite zones is extensive and ubiquitous.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Chalcopyrite
Ore: Arsenopyrite
Gangue: Quartz
Comments
Comment (Deposit): Other Comments = Geological features are similar to Chip-Loy prospect (MG032) in McGrath A-3 quadrangle.
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Inferred to be Tertiary based on ages of plutonic suite in area (Solie and others, 1991).
Comment (Reference): Primary Reference = Bundtzen and others, 1988
Comment (Geology): Geologic Description = The Post Lake prospect consists of massive, sulfide veins and replacement zones that cut Ordovician to Lower Silurian shale of the Post River Formation, a unit of the Dillinger subterrane (Bundtzen and others, 1988; Bundtzen, Harris, and Gilbert, 1997). The mineralized area is about 122 meters south of the contact between the Post River Formation and a small quartz monzonite stock. A prospect map has been published by Bundtzen and others (1988). Most of the sulfide mineralization consists of massive pyrrhotite, and minor to sparse chalcopyrite and arsenopyrite. Sulfide masses vary from 0.5 to 2 meters in thickness and strike lengths of 20 to 80 meters. Most of the mineralization trends about N25W, parallel to the nearby Bowser Creek fault. . Bundtzen and others (1988) reported values as high as 570 ppm copper, 302 ppm zinc, 378 ppm arsenic, 139 ppm cobalt, and 637 ppm nickel. Five chip samples taken across the massive sulfides averaged about 33.5 percent iron. Elevated cobalt and nickel values occur in the massive pyrrhotite zones.
Comment (Workings): Workings / Exploration = Only surface sampling has been conducted. Bundtzen and others (1988) reported values as high as 570 ppm copper, 302 ppm zinc, 378 ppm arsenic, 139 ppm cobalt, and 637 ppm nickel. Five chip samples taken across the massive sulfide zones averaged about 33.5 percent iron. Elevated cobalt and nickel values occur in the massive pyrrhotite zones.
Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).
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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