Unnamed (upper Horsfeld Creek)

Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000778
MRDS ID A011421
Record type Site
Current site name Unnamed (upper Horsfeld Creek)
Alternate or previous names Unnamed

Geographic coordinates

Geographic coordinates: -141.25859, 62.05582 (WGS84)
Relative position Best location: Richter and others, 1973, USGS I-807, loc. 6. 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
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate)
    Rock unit name Chisana Formation
    Rock description Chisana Formation
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Volcanic Breccia (Agglomerate)

Nearby scientific data

(1) -141.25859, 62.05582

Comments on the geologic information

  • Geologic Description = 2-ft-wide quartz vein containing chalcopyrite in volcanic breccia of the Chisana Formation of Cretaceous age.

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 = Grab sample of quartz vein assayed: 30 ppm Ag, 0.04 ppm Au, 10,000 ppm Cu, 7000 ppm Pb, 700 ppm Zn (USGS OF 471, sample 153). Type of workings: surface

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011421
USGS Alaska Resource Data File ARDF NB098

Bibliographic references

  • 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.

  • Deposit

    Matson, N.A., and Richter, D.H., 1971, Geochemical data from the Nabesna A-1 quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-0202, 10 p.

Comments on the references

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

General comments

Subject category Comment text
Deposit Model Name = Lode: vein

Reporter information

Type Date Name Affiliation Comment
Reporter 07-FEB-1997 Leonard, K.R. U.S. Geological Survey
Reporter 07-FEB-1997 Elliott, R.L. U.S. Geological Survey
Reporter 07-FEB-1997 Richter, D.H. U.S. Geological Survey