Unnamed (south-central Hinchinbrook Island)

Occurrence in Alaska, United States with commodities Manganese, Barium-Barite, Iron, Zinc
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

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).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova B-7(quadrangle 1:63,360 scale)

Cordova SW(quadrangle 1:100,000 scale)

Cordova(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern Prince William Sound(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

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

Economic information

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 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

Bibliographic references

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.