Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-1
Latitude 63.094
Longitude -147.44
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,650 feet, 0.7 mile due east of south end of the east lake at Susitna Lodge. The map site is in the SW1/4 of sec. 18, T. 21 S., R. 2 E., of the Fairbanks Meridian. The location is accurate to within 500 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).
This occurrence was described by Glavinovich (1976) as follows: 'The mineralized sample was found in talus. The mineralization consists of malachite, minor chalcocite and bornite occurring in small quartz pods and stringers in an amygdaloidal andesite.'
Geologic map unit (-147.442254993717, 63.093550142313)
Mineral deposit model Hydrothermally altered shear zone.
Age of mineralization Triassic or younger.

Production and reserves

Indication of production None