Unnamed (south wall of valley of Windy Creek)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10307596
Record type Site
Current site name Unnamed (south wall of valley of Windy Creek)

Geographic coordinates

Geographic coordinates: -147.35675, 63.09963 (WGS84)
Relative position This occurrence is at an elevation of about 4,500 feet on the south wall of the valley of Windy Creek. It is near the north end of the boundary bwtween secs. 15 and 16, T. 21 S., R. 2 E., of the Fairbanks Meridian. The site is shown as site 30 in Smith (1981). The location is accurate to within 500 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Gangue = iron carbonate

Materials information

Materials Type of material
Azurite Ore
Chalcopyrite Ore
Malachite Ore
Epidote Gangue

Alteration

  • (Local) Propylitic alteration of greenstone.

Nearby scientific data

(1) -147.35675, 63.09963

Comments on the geologic information

  • Geologic Description = The bedrock in the area of this occurrence is mainly 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). This small mineral occurrence consists of a small shear zone along which hydrothermal alteration has produced epidote, chalcopyrite, and iron carbonate minerals. Weathering produces malachite- and azurite-coated float and encrustations. This small mineral occurrence is one of many similar deposits in the Nikolai Greenstone. Most of these occurrences are part of an east-northeast trending fault zone several miles wide.
  • 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 HE186

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

    Smith, T.E., 1981, Geology of the Clearwater Mountains, south-central Alaska: Alaska Division of Geological & Geophysical Surveys Geologic Report 60, 72 p., 3 sheets, scale 1:63,360.

  • 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

General comments

Subject category Comment text
Deposit Model Name = Hydrothermally altered shear zone.
Deposit Other Comments = This occurrence is about 0.25 miles southeast of HE187.

Reporter information

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