The Pyrrhotite is a nickel, iron, copper, and cobalt 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: Nickel, Iron, Copper, Cobalt
Lat, Long: 62.287, -153.77800
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Pyrrhotite MRDS details
Site Name
Primary: Pyrrhotite
Commodity
Primary: Nickel
Primary: Iron
Primary: Copper
Primary: Cobalt
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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Polymetallic replacement
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: None.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrrhotite
Ore: Pyrite
Gangue: Calcite
Comments
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = The Pyrrhotite occurrence consists of several semi-massive to massive pods of pyrrhotite and minor pyrite enclosed in banded hornfels and marble adjacent to a small stock of highly altered granodiorite porphyry. The host rocks are thermally altered marble and clastic sediments of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen and others, 1997). . Pyrrhotite occurs as disseminated grains in veinlets up to 8 centimeters thick, as semimassive to massive sulfide pods up to 30 centimeters thick, and as clots and crystals up to three centimeters across. Grab samples of pyrrhotite-rich sulfide mineralization collected during investigations by Anaconda Minerals Company contained up to 0.44 percent nickel and 460 ppm cobalt (Brewer and others, 1992). Selected samples reported by Foley (1987) contain up to 180 ppm nickel, 180 ppm copper, and 180 ppm zinc. Massive pyrrhotite-bearing samples contained 58.00 percent iron.
Comment (Reference): Primary Reference = Foley, 1987
Comment (Deposit): Model Name = Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).
Comment (Deposit): Other Comments = See Post Lake Prospect (MG069).
Comment (Workings): Workings / Exploration = The Pyrrhotite occurrence was noted by the reporter during mapping conducted in 1981 (Bundtzen, Kline, and Clough, 1982). Grab samples of pyrrhotite-rich sulfide mineralization collected by Anaconda Minerals Company contained up to 0.44 percent nickel and 460 ppm cobalt (Brewer and others, 1992). Selected samples reported by Foley (1987) contain to 180 ppm nickel, 180 ppm copper, and 180 ppm zinc. Massive pyrrhotite-bearing samples contained up to 58.00 percent iron.
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): Brewer, N.H., Puchner, C.C., and Gemuts, I., 1992, Farewell district, southwest Alaska Range: North Pacific Mining Company prospectus report, 21 pages
Reference (Deposit): Foley, J.Y., 1987, Reconnaissance strategic and critical mineral investigations in the McGrath A-3 and B-2 quadrangles, southwest Alaska: U.S. Bureau of Mines Field Report, 26 pages.
Reference (Deposit): Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary geologic map of the McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File report 149, 22 pages, one sheet, scale 1:63,360.
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