Unnamed (southeast of Soda Lake)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000796
MRDS ID A011441
Record type Site
Current site name Unnamed (southeast of Soda Lake)
Alternate or previous names Unnamed

Geographic coordinates

Geographic coordinates: -142.89146, 62.53276 (WGS84)
Relative position Best location: Richter and others, 1976, USGS GQ-1303. Accurate within 100 ft radius
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary

Comments on the commodity information

  • Ore Material = Copper (native)

Materials information

Materials Type of material
Copper Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Nikolai Greenstone
    Rock description Nikolai Greenstone
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt

Nearby scientific data

(1) -142.89146, 62.53276

Comments on the geologic information

  • Geologic Description = Native copper in fractures in amygdaloidal basalt flows 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 Chisana

Comments on the workings information

  • Workings / Exploration = Type of workings: none

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011441
USGS Alaska Resource Data File ARDF NB017

Bibliographic references

  • 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, 1975, USGS MF-655K

General comments

Subject category Comment text
Deposit Model Name = Lode: volcanogenic
Deposit Other Comments = the Nikolai Greenstone itself is significant in that it may constitute a future low grade copper resource. It is widespread south of the Denali fault, has an overall thickness of 2000 m and an average copper content of 150 ppm. Locally it contains small deposits of native copper, bornite, chalcocite, and chalcopyrite in amygdules, flow tops and bottoms, fractures and veins. USGS MF-655K, USGS OF 365 and USGS OF 366 contain maps showing several known occurences of copper minerals in the Nikolai Greenstone.

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