Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10001035
MRDS ID A011712
Record type Site
Current site name Nikolai
Related records 10234239

Geographic coordinates

Geographic coordinates: -142.67859, 61.46356 (WGS84)
Relative position Near head of Nikolai Creek, a tributary of McCarthy Creek. Best location: MacKevett, 1974. Accurate within radius of 100 feet.
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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
Calcite Gangue
Epidote Gangue
Pyrite Gangue
Pyrrhotite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Rock unit name Nikolai Greenstone
    Rock description Nikolai Greenstone
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Rock unit name Chitistone Limestone
    Rock description Chitistone Limestone

Nearby scientific data

(1) -142.67859, 61.46356

Comments on the geologic information

  • Geologic Description = Two Cu-bearing veins, each less than 1 m thick, in shear zones in Triassic Nikolai Greenstone about 150 ft below base of Chitistone Limestone and just north of major fault. Veins mainly bornite and chalcopyrite, and minor pyrite, pyrrhotite and secondary Cu and Fe minerals in a quartz-calcite-epidote gangue.
  • Age = Cretaceous

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nizina

Comments on the workings information

  • Workings / Exploration = Deposit known to natives in late 1800's. Developed in 1899 by open cuts and more than 100 m underground workings but little work since. Mostly inaccessible by 1943. Surface and underground workings.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011712
USGS Alaska Resource Data File ARDF MC136

Bibliographic references

  • Deposit

    Miller, D.J., 1946, Copper deposits of the Nizina district, Alaska: U.S. Geological Survey Bulletin 947F, p. 93-120.

  • Deposit

    MacKevett, E.M., Jr., and Smith, J.G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p.

  • Deposit

    MacKevett, E.M., Jr., 1974, Geologic map of the McCarthy B-5 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1146, scale 1:63,360.

  • Deposit

    MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, scale 1:250,000.

Comments on the references

  • Primary Reference = Miller, 1946

General comments

Subject category Comment text
Deposit Model Name = Vein, replacement, shear zone

Reporter information

Type Date Name Affiliation Comment
Reporter 07-MAR-94 Leonard, K.R. U.S. Geological Survey
Reporter 07-MAR-94 Elliott, R.L. U.S. Geological Survey
Reporter 07-MAR-94 Nokleberg, W.J. U.S. Geological Survey
Reporter 07-MAR-94 Richter, D.H. U.S. Geological Survey