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Unnamed (near Toby Creek)

Occurrence in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10001039
MRDS ID A011716
Record type Site
Current site name Unnamed (near Toby Creek)
Alternate or previous names Unnamed

Geographic coordinates

Geographic coordinates: -142.27553, 61.49774 (WGS84)
Relative position Two occurrences 1,000-1,200 ft upstream, on both sides of an unnamed tributary of Chitistone River. The unnamed tributary is 1.5 mi upstream from mouth of Toby 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

Materials information

Materials Type of material
Chalcocite Ore
Malachite Ore

Alteration

  • (Local) Oxidation of Cu minerals.

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
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -142.27553, 61.49774
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Comments on the geologic information

  • Geologic Description = Chalcocite and malachite bearing veinlets in lower part of Triassic Nikolai Greenstone.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nizina

Comments on the workings information

  • Workings / Exploration = No workings.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011716
USGS Alaska Resource Data File ARDF MC147

Bibliographic references

  • 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 = MacKevett and Smith, 1972

General comments

Subject category Comment text
Deposit Model Name = Lode: vein.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-NOV-1997 Leonard, K.R. U.S. Geological Survey
Reporter 14-NOV-1997 Elliott, R.L. U.S. Geological Survey
Reporter 14-NOV-1997 Richter, D.H. U.S. Geological Survey