Black Mountain

The Black Mountain is a antimony, silver, 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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Site Name

Primary: Black Mountain

Commodity

Primary: Antimony
Primary: Silver
Primary: Gold

Location

State: Alaska
District: Aniak

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: Simple Sb (veins, pods, etc)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Granite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cretaceous

Name: Granite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Stibnite

Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Cretaceous or Tertiary . The vein crosscuts clastic sedimentary rocks that may range in age from lare Paleozoic to mid-Cretaceous (Bundtzen and Laird, 1991). The nearby granitic rocks may be Cretaceous or Tertiary.

Comment (Workings): Workings / Exploration = Cady and others (1955) reported that claims have been staked on the prospect. Some small pits or trenches are probably present.

Comment (Reference): Primary Reference = Ebbley and Wright, 1948

Comment (Deposit): Model Name = Simple Sb deposits (Cox and Singer, 1986; model 27d)

Comment (Geology): Geologic Description = A single, 2-inch wide, stibnite-bearing vein in shaly sandstone was traced for a distance of 200 feet at this location (Ebbley and Wright, 1948). The vein trends subparallel to the contact between clastic sedimentary country rocks and a granitic stock upslope to the north of the vein (Ebbley and Wright, 1948; Hoare and Coonrad, 1959). Host rocks to the vein are not altered, and only one vein has been identified at this prospect. A sample collected along 50 feet of the vein contained 48.9 percent antimony, 0.02 ounce of gold per ton, and 0.2 ounce of silver per ton (Ebbley and Wright, 1948). The sedimentary rocks may either be part of the mid-Cretaceous Kuskokwim Group (Hoare and Coonrad, 1959), or possibly an upper Paleozoic or Mesozoic section correlative with parts of the Gemuk Group (Bundtzen and Laird, 1991). The nearby granitic rocks may be part of a Cretaceous or Tertiary igneous assemblage that is widespread through southwest Alaska.

References

Reference (Deposit): Hoare, J.M., and Coonrad, W.L., 1959, Geology of the Russion Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-292, 1 sheet, scale 1:250,000.

Reference (Deposit): Hoare, J M., and Cobb, E.H., 1972, Metallic mineral resources map of the Russian Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-444, 1 sheet, scale 1:250,000.

Reference (Deposit): Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p.

Reference (Deposit): Bundzten, T.K., and Laird, G.M., 1991, Geology and mineral resources of the Russian Mission C-1 Quadrangle, southwest Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 109, 24 p.

Reference (Deposit): Hoare, J M., and Cobb, E.H., 1972, Metallic mineral resources map of the Russian Mission quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-444, scale 1:250,000.

Reference (Deposit): Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.

Reference (Deposit): Ebbley, N., and Wright, W.S., 1948, Antimony deposits in Alaska: U.S. Bureau of Mines Report of Investigations 4173, 41 p.

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