The Unnamed (south-central Hinchinbrook Island) 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 (south-central Hinchinbrook Island) MRDS details
Site Name
Primary: Unnamed (south-central Hinchinbrook Island)
Commodity
Primary: Manganese
Secondary: Barium-Barite
Secondary: Iron
Secondary: Zinc
Location
State: Alaska
District: Copper River
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: Volcanogenic Mn
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Rancieite
Ore: Birnessite
Ore: Todorokite
Ore: Bementite
Ore: Barite
Comments
Comment (Workings): Workings / Exploration = Site discovered during regional geologic mapping (Nelson and others, 1985). Minor interest by industry during exploration activity in mid-1980s. Selected samples contained 29-35% Mn, 14% Fe, 6700 ppm Ba, 3400 ppm Zn (Goodfellow and others, 1984).
Comment (Deposit): Other Comments = Location is within the Chugach National Forest.
Comment (Geology): Geologic Description = This occurrence consists of a 30 x 90 ft. outcrop area of manganese-bearing nodules and encrustations in an interbedded sequence of sedimentary and volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). The occurrence is interpreted as a sedimentary manganese deposit developed on the sea floor (Goodfellow and others, 1984). Selected samples contained 29-35% Mn, 14% Fe, 6700 ppm Ba, 3400 ppm Zn (Goodfellow and others, 1984).
Comment (Geology): Age = Probably Tertiary based on the age of the host rocks.
Comment (Reference): Primary Reference = Goodfellow and others, 1984
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Volcanogenic Mn (Cox and Singer, 1986; model 24c)
References
Reference (Deposit): Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, scale 1:250,000.
Reference (Deposit): Goodfellow, R., Nelson, S.W., Bouse, R.M., and Koski, R.A., 1984, The geologic setting and composition of a newly discovered manganese deposit on Hinchinbrook Island, Alaska: U.S. Geological Survey Open-Fle Report 84-671, 50 p.
Reference (Deposit): Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.
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