Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000774
MRDS ID A011417
Record type Site
Current site name Sulzer
Alternate or previous names Cosmopolitan Group, O'hara Property

Geographic coordinates

Geographic coordinates: -141.46361, 62.20027 (WGS84)
Relative position Best location: Richter and others, 1973, USGS I-807, loc. 1; ridge between forks of the Snag River. Accurate within 100 ft. radius
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Malachite Ore

Mineral occurrence model information

Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Nikolai Greenstone;Nikolai Greenstone
    Rock description Nikolai Greenstone;Nikolai Greenstone

Nearby scientific data

(1) -141.46361, 62.20027

Comments on the geologic information

  • Geologic Description = Malachite in fractures, amygdules, and volcanic breccias in amygdaloidal basalt flows of the Triassic Nikolai Greenstone. Tunnel was driven in a northwest- trending fracture zone at the contact between a flow breccia and an overlying amygdaloidal basalt flow.
  • Age = Late Triassic

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chisana

Comments on the workings information

  • Workings / Exploration = Explored by open cuts and 2 adits, one of which was 87 ft long; reported caved in 1940. Surface and underground workings.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011417
USGS Alaska Resource Data File ARDF NB094

Bibliographic references

  • Deposit

    Moffit, F.H., 1954, Geology of the eastern part of the Alaska Range and adjacent area: U.S. Geological Survey Bulletin 989-D, p. 63-218.

  • Deposit

    Matson, N.A., and Richter, D.H., 1971, Geochemical data from the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-0202, 10 p.

  • Deposit

    Richter, D.H., Matson, N.A., Jr., and Smoll, H.R., 1973, Reconnaissance geologic map of the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-807, scale 1:63,360.

  • Deposit

    Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, scale 1:250,000.

  • Deposit

    Pilgrim, E.R., 1931, White River Precinct, Snag River area, in Stewart, B.D., Report on cooperation between the territory of Alaska and the United States in making mining investigations and in inspection of mines for the biennium ending March 31, 1931, p, 74-76.

Comments on the references

  • Primary Reference = Moffit, 1954, USGS B 989-D, p. 204-205

General comments

Subject category Comment text
Deposit Model Name = Massive sulfide
Deposit Other Comments = Nikolai Greenstone hostrock is known for its anomalous Cu content.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JAN-1997 Leonard, K.R. U.S. Geological Survey
Reporter 28-JAN-1997 Elliott, R.L. U.S. Geological Survey
Reporter 28-JAN-1997 Nokleberg, W.J. U.S. Geological Survey
Reporter 28-JAN-1997 W.J.; Richter, D.H. U.S. Geological Survey