Green Butte

Past Producer in Alaska, United States with commodities Silver, Copper

Geologic information

Identification information

Deposit ID 10001040
MRDS ID A011717
Record type Site
Current site name Green Butte
Related records 10234304

Geographic coordinates

Geographic coordinates: -142.77137, 61.48856 (WGS84)
Relative position Southwestern flank of Green Butte, at 4,000 ft elevation. Best location: MacKevett, 1974. Accurate within radius of 100 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary

Materials information

Materials Type of material
Azurite Ore
Bornite Ore
Chalcocite Ore
Covellite Ore
Malachite Ore
Calcite Gangue
Dolomite Gangue

Mineral occurrence model information

Model code 87
USGS model code 23
BC deposit profile D03
Deposit model name Basaltic Cu (BC name is Volcanic redbed Cu)
Mark3 model number 118

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
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Chitistone Limestone
    Rock description Chitistone Limestone

Nearby scientific data

(1) -142.77137, 61.48856

Comments on the geologic information

  • Geologic Description = Veinlike replacement lodes and cavity fillings forming discontinuous masses of chalcocite and other copper minerals up to 4 ft thick in lower part of Triassic Chitistone Limestone, near contact with underlying Triassic Nikolai Greenstone, which is separated from limestone by a thin bed of shale.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nizina

Comments on the production information

  • Production Notes = Reported to have produced about 1,500 tons of high-grade ore that contained about 1,200 pounds of copper and 10 ounces of silver per ton.

Comments on the workings information

  • Workings / Exploration = About 11,000 ft of drifts and crosscuts on 8 levels, 1,500 ft of inclines and 2,500 ft of raises, winzes and stopes. In 1943, 500 ft level and lower levels were flooded and considerable portions of 100 ft and 400 ft levels caved.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011717
USGS Alaska Resource Data File ARDF MC133

Bibliographic references

  • Deposit

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

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 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 = Basaltic Cu

Reporter information

Type Date Name Affiliation Comment
Reporter 14-NOV-97 Leonard, K.R. U.S. Geological Survey
Reporter 14-NOV-97 Elliott, R.L. U.S. Geological Survey
Reporter 14-NOV-97 Richter, D.H. U.S. Geological Survey