Unnamed (south wall of valley of upper Windy Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; chalcopyrite; malachite
Gangue minerals epidote; iron carbonate

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-1
Latitude 63.11
Longitude -147.215
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,300 feet on the south wall of the valley of upper Windy Creek. It is in the NW1/4 of sec. 8, T. 21 S., R. 3 E., of the Fairbanks Meridian. The location is accurate to within 500 feet. This occurrence is site 32 in Smith (1981).

Geologic setting

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.
Geologic map unit (-147.217256175493, 63.109553125487)
Mineral deposit model Hydrothermally altered shear zone.
Age of mineralization Triassic or younger.
Alteration of deposit Propylitic alteration of greenstone.

Production and reserves

Indication of production None

References

MRDS Number 10307599

References

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 No. 10, 55 p.
Reporters D.L. Stevens (Stevens Exploration Management Corporation)
Last report date 4/7/2000