Midas

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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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