Unnamed

The Unnamed is a chromium 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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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: Unnamed
Secondary: Western Crazy Mountains

Commodity

Primary: Chromium

Location

State: Alaska
District: Circle

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chromite

Comments

Comment (Reference): Primary Reference = Barker, 1984.

Comment (Workings): Workings / Exploration = Surface samples taken.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The western Crazy Mountains are composed of a complexly faulted succession of predominantly clastic, weakly metamorphosed sedimentary rocks. They have either been intruded by or are in fault contact with mafic sills, dikes, and at least several small intrusive, stock-like bodies (Barker, 1984, p. 6). The western Crazy Mountains are bounded on the south by the prominent Preacher Creek Fault (Weber and Foster, 1980), a splay of the Tintina Fault.? A silicified chert-pebble conglomerate exposed on a hillside overlies an altered zone inferred to be a thrust fault. Disseminated grains in the silica matrix were tentatively identified as chromite, and make up about 1 percent of the conglomerate. Petrographic examination indicated that sericite in the matrix and halos of fuchsite (chrome mica) around the chromite grains have developed as alteration products (Barker, 1984, p. 13, 14). Analysis shows 2000 ppm Cr (Barker, 1984, p. 15).

References

Reference (Deposit): Barker, J.C., 1984, Concentration of cobalt and other metals in the western Crazy Mountains, interior Alaska: U.S. Bureau of Mines Open-File Report 213-84, 44 p.

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