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Unnamed (south of upper Gravel Creek)

Prospect in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10000777
MRDS ID A011420
Record type Site
Current site name Unnamed (south of upper Gravel Creek)
Alternate or previous names Unnamed
Related records 10282547

Geographic coordinates

Geographic coordinates: -141.25248, 62.08249 (WGS84)
Relative position Best location: Richter and others, 1973, USGS I-807, loc. 5. Accurate within 100 ft radius
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Gangue

Alteration

  • (Local) Altered area 100 m by 300 m, principally of limonite staining from oxidation of sulfides

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -141.25248, 62.08249
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Comments on the geologic information

  • Geologic Description = Disseminated pyrite and minor chalcopyrite in small diorite stock that intrudes Cretaceous or Jurassic hornfelsed argillite

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 = Type of workings: surface

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011420
USGS Alaska Resource Data File ARDF NB097

Bibliographic references

  • Deposit

    Richter, D.H., and Matson, N.A., 1972, Metallic mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-422, scale 1:250,000.

  • 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.

Comments on the references

  • Primary Reference = Richter and others, 1973, USGS I-807, loc. 5.

General comments

Subject category Comment text
Deposit Model Name = Lode: porphyry
Deposit Other Comments = See also: Baultoff (NB100), Horsfeld (NB099)

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-1997 Leonard, K.R. U.S. Geological Survey
Reporter 04-FEB-1997 Elliott, R.L. U.S. Geological Survey
Reporter 04-FEB-1997 Richter, D.H. U.S. Geological Survey