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
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Unnamed MRDS details
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.
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