Unnamed (south of William Creek)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000792
MRDS ID A011437
Record type Site
Current site name Unnamed (south of William Creek)
Alternate or previous names Unnamed

Geographic coordinates

Geographic coordinates: -142.44253, 62.19859 (WGS84)
Relative position Best location: Richter and Matson, 1969, USGS OF 365, loc. 329. Accurate within 100 ft radius
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Ore Material = Secondary Cu minerals

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Nabesna Pluton
    Rock description Nabesna Pluton
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -142.44253, 62.19859

Comments on the geologic information

  • Geologic Description = Copper-stained breccia at contact between Cretaceous granodiorite and Triassic limestone

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Chisana

Comments on the workings information

  • Workings / Exploration = Chip sample across 1.5 ft of Cu-stained breccia assayed: 2.0 ppm Au, 3 ppm Ag, 700 ppm B, 7000 ppm Cu, 700 ppm Zn (USGS OF 365, sample 329). Type of workings: surface

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011437
USGS Alaska Resource Data File ARDF NB068

Bibliographic references

  • Deposit

    Richter, D.H., and Matson, N.A., 1969, Geochemical data from the Nabesna A-3 quadrangle, Alaska: U.S. Geological Survey Open-File Report 69-223, 5 p., 1 sheet, scale 1:63,360.

  • Deposit

    Richter, D.H., 1971, Reconnaissance geologic map, and section of the Nabesna A-3 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-655, scale 1:63,360.

Comments on the references

  • Primary Reference = Richter and Matson, 1971, USGS OF 365

General comments

Subject category Comment text
Deposit Model Name = Lode: contact metamorphic?
Deposit Other Comments = Possibly related to several skarn occurrences about 2 mi SW in SW 1/4, sec. 29, T. 5 N, R. 16 E., Nabesna A-3 quadrangle; see USGS OF 365

Reporter information

Type Date Name Affiliation Comment
Reporter 10-FEB-1997 Leonard, K.R. U.S. Geological Survey
Reporter 10-FEB-1997 Elliott, R.L. U.S. Geological Survey
Reporter 10-FEB-1997 Richter, D.H. U.S. Geological Survey