Unnamed (south of lower Windy Creek)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; bornite; chalcocite; chalcopyrite; covellite; native copper
Gangue minerals epidote; quartz; siderite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-1
Latitude 63.09
Longitude -147.36
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,800 feet on a ridge about 2.2 miles south of lower Windy Creek. The site is in the SE1/4 of sec. 16, T. 21 S., R. 2 E., of the Fairbanks Meridian.

Geologic setting

Geologic description

The general area of this occurrence is underlain by the Middle or Upper Triassic Nikolai Greenstone, which consists of massive, 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 occurrence is in greenstone and consists of a small, hydrothermally altered shear zone containing epidote, copper sulfide minerals, and possibly native copper and an iron carbonate mineral. Weathering locally produces malachite and azurite-coated float and encrustations.
Geologic map unit (-147.362253950936, 63.0895510143279)
Mineral deposit model Hydrothermally altered shear zone.
Age of mineralization Triassic or younger.
Alteration of deposit Propylitic alteration of greenstone.

Production and reserves

Workings or exploration Surface chip sampling only.
Indication of production None

References