Unnamed

The Unnamed is a manganese 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: Unnamed

Commodity

Primary: Manganese
Secondary: Iron

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: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Sedimentary Mn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Extensive development of iron and manganese oxides.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrolusite

Comments

Comment (Geology): Geologic Description = Both iron and manganese oxides are strongly developed in deformed shale and sandstone for about 500 feet along the banks of the Kukokwim River. The age of the shale is unknown and could be either Paleozoic (Nixon Fork subterrane) or Late Cretaceous (Kuskokwim Group). The apparant beding in the shale is N 55 E with steep southeasterly dips. A strong shear zone plunges N 25 E at 20 degrees. The main ore minerals present are pyrolusite and goetthite, both of which occur as coatings and impregnations on fracture surfaces in the shear zone. A distinct N 10 E lineament, which controls the trend of the hills north of the river, runs through the manganiferous area. Although Patton and Moll (1983) suggest this is a sedimentary manganese deposit, field evidence suggests that it may also be an accumulation of iron and manganese oxides within a shear zone. Surface samples have yielded up to 23.00 percent manganses (Berg and Cobb, 1967).

Comment (Commodity): Ore Material = Manganese carbonate

Comment (Deposit): Other Comments = In Nixon Fork subterrane of Farewell Composite Terrane (Bundtzen and others, 1997), or Cretaceous Kuskokwim Group.

Comment (Deposit): Model Name = Sedimentary Manganese(?) or unknown (Cox and Singer, 1986; model no. 34b(?))

Comment (Workings): Workings / Exploration = Surface samples contained up to 23 percent manganese. (Berg and Cobb, 1967).

Comment (Reference): Primary Reference = Berg and Cobb, 1967

Comment (Exploration): Status = Inactive

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): Patton, W.W., Jr., and Moll, E.J., 1983, Mineral resource assessment map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-G, 3 sheets, scale 1:250,000.

Reference (Deposit): Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Economic Geology Monograph #9, Mineral Deposits of Alaska, p. 242-286.

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.