Unnamed (east of Susitna Lodge airstrip)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10307593
Record type Site
Current site name Unnamed (east of Susitna Lodge airstrip)

Geographic coordinates

Geographic coordinates: -147.44975, 63.08562 (WGS84)
Relative position This occurrence is at an elevation of 2,420 feet, 0.75 mile due east of the south end of the Susitna Lodge airstrip. The map site is in the NW1/4 of sec. 19, T. 21 S., R. 2 E., of the Fairbanks Meridian. The location is accurate to within 200 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Malachite Ore
Copper Ore
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) Propylitic alteration of greenstone

Nearby scientific data

(1) -147.44975, 63.08562

Comments on the geologic information

  • Geologic Description = The area of this occurrence is underlain by the Middle or Upper Triassic Nikolai Greenstone, a thick sequence of subaerial and submarine basalt flows and minor interbedded volcaniclastic sedimentary rocks, aquagene and epiclastic tuff, breccia, argillite, and radiolarian chert (Nokleberg and others, 1992). The deposit is in a hydrothermally altered shear zone in greenstone, and consists of quartz, epidote, chalcopyrite, and an iron carbonate mineral. Weathering produces malachite- and azurite-coated float and encrustations. Glavinovich (1967) describes this occurrence as follows: 'Mineralized amygdaloidal andesite occurs in talus. Bornite, malachite and microscopic native copper associated with quartz pods occur in the andesite. The small quartz pods appear to have formed by replacement of the andesite. Bornite is later than the quartz and may, in part, be replacing it. Some of the strongly epidotized rock (greenstone) contains splashes of bornite, chalcocite (?) and malachite along fracture surfaces'.
  • Age = Triassic or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Valdez Creek

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF HE180

Bibliographic references

  • Deposit

    Glavinovich, P.S., 1967, Trace element copper distribution and areal geology in a portion of the Clearwater Mountains, Alaska: University of Alaska Minerals Industry Research Laboratory, Report 10, 55 p.

  • Deposit

    Nokleberg, W.J., and others, 1992, Circum-North Pacific terrane map, in Tracy, K.V., Anker, E. M., Ryan, C., Hoffman, V. , eds., International conference on Arctic margins, p. 44.

Comments on the references

  • Primary Reference = Glavinovich, 1967

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-00 D.L. Stevens Stevens Exploration Management Corporation