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Westover

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

Identification information

Deposit ID 10001033
MRDS ID A011709
Record type Site
Current site name Westover
Related records 10185810

Geographic coordinates

Geographic coordinates: -142.49941, 61.39662 (WGS84)
Relative position Near head of Boulder Creek, a tributary of Dan Creek. Best location: MacKevett and Smith, 1972. Accurate within radius of 100 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Malachite Ore

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

Nearby scientific data

(1) -142.49941, 61.39662
ListMap

Comments on the geologic information

  • Geologic Description = Bornite and minor chalcocite, malachite and chalcopyrite in wedge-shaped pods, lenses, veins, and disseminations in lower 20 ft of the Upper Triassic Chitistone Limestone which overlies the Nikolai Greenstone. Largest pod 10 m long and 3 m wide. Limestone locally silicified near ore. Similar to Kennicott deposit (MC003).
  • Age = Cretaceous

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 = Minor production 1911-1920.

Comments on the workings information

  • Workings / Exploration = More than 400 m of underground workings on 4 unconnected levels driven between 1911 and 1930. Channel samples across lode contain 50 ppm Ag, 2,000 ppm As, >2 percent Cu (MacKevett and Smith, 1968).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011709
USGS Alaska Resource Data File ARDF MC161

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., 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., and Smith, J.G., 1972, Geologic map of the McCarthy B-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-943, 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 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