The Midas is a silver, copper, and gold 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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Midas MRDS details
Site Name
Primary: Midas
Secondary: Berg Creek
Commodity
Primary: Silver
Primary: Copper
Primary: Gold
Location
State: Alaska
District: Chistochina
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Skarn Cu
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Triassic
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Jurassic
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Gold
Ore: Magnetite
Ore: Pyrite
Comments
Comment (Workings): Workings / Exploration = 5 adits in vicinity, all caved or blocked by ice by 1943. Grab sample of vein assayed: 8 ppm Au (AA), 10 ppm Ag, 1,000 ppm Cu, 20 ppm Mo. Grab sample of skarn assayed: 0.6 ppm Au (AA), 1.5 ppm Ag, 20,000 ppm Cu, 500 ppm Co (MacKevett, 1976). Underground workings.
Comment (Exploration): Status = Inactive
Comment (Reference): Primary Reference = Moffit and Mertie, 1923
Comment (Deposit): Model Name = Cu skarn
Comment (Geology): Geologic Description = At lower (main) workings Au-bearing quartz veins and magnetite and epidote skarn containing irregularly distributed pyrite and chalcopyrite occur in Chitistone Limestone, near contact with Jurassic granodiorite pluton. At upper workings disseminated to small masses of magnetite, pyrite, and chalcopyrite occur in quartz veins and skarn bodies in metamorphosed Triassic Nizina Limestone near contact to same Jurassic granodiorite pluton.
Comment (Geology): Age = Jurassic
References
Reference (Deposit): Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.
Reference (Deposit): MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, scale 1:250,000.
Reference (Deposit): MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.
Reference (Deposit): Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
Reference (Deposit): Van Alstine, R.E., and Black, R.F., 1946, Copper deposits of the Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 947-G, p. 121-141.
Reference (Deposit): MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, scale 1:63,360.
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