Unnamed (south-central Hinchinbrook Island)

Occurrence in Alaska, United States with commodities Manganese, Barium-Barite, Iron, Zinc

Geologic information

Identification information

Deposit ID 10307394
Record type Site
Current site name Unnamed (south-central Hinchinbrook Island)

Geographic coordinates

Geographic coordinates: -146.42749, 60.35158 (WGS84)
Relative position This site is located on Hinchinbrook Island and occupies an area of approximately 0.25 sq. mi. in the center of sec. 34, T. 17 S., R. 7 W., of the Copper River Meridian. The center of the area is at approximately the 1500 ft elevation. Location is accurate to within 600 ft. Shown as site C-98 in Jansons and others (1984).
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Manganese Primary
Barium-Barite Secondary
Iron Secondary
Zinc Secondary

Materials information

Materials Type of material
Barite Ore
Bementite Ore
Todorokite Ore
Birnessite Ore
Rancieite Ore

Mineral occurrence model information

Model code 97
USGS model code 24c
Deposit model name Volcanogenic Mn

Nearby scientific data

(1) -146.42749, 60.35158

Comments on the geologic information

  • 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).
  • Age = Probably Tertiary based on the age of the host rocks.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the workings information

  • 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF CV065

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Goodfellow and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Volcanogenic Mn (Cox and Singer, 1986; model 24c)
Deposit Other Comments = Location is within the Chugach National Forest.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson U.S. Geological Survey