Unnamed (south of lower Windy Creek)

Occurrence, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-1
Latitude 63.1104
Longitude -147.4395
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,960 feet, about 1.75 miles north-northeast of Susitna Lodge. The map site is in the NW1/4 of sec. 7, T. 21 S., R. 2 E., of the Fairbanks Meridian. The location is accurate to within 250 feet.

Geologic setting

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.
Geologic map unit (-147.441756282392, 63.1099503984711)
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