Unnamed (north flank of Paxson Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; chrysocolla; malachite
Gangue minerals opal; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-4
Latitude 63.0729
Longitude -145.6366
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 4,050 feet on the north flank of Paxson Mountain, south of the Denali Highway. It is in the NE1/4NE1/4 section 28, T. 21 S., R. 11 E., Fairbanks Meridian. The occurrence corresponds to locality 7 of Rose and Saunders (1965) and locality S91 in table 2 in Nokleberg and others (1991).

Geologic setting

Geologic description

Several bornite-bearing quartz veinlets, as much as a half-inch wide, cut purplish vesicular metabasalt at this location (Rose and Saunders, 1965). Some vesicles are filled with opal. Minor amounts of chalcocite accompany the bornite, and both are partly oxidized to malachite and chrysocolla. The host rock is Nikolai Greenstone of Late Triassic age.
Geologic map unit (-145.63882808269, 63.072479571486)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Probably Cretaceous.
Alteration of deposit The metabasalt is altered to chlorite and epidote; copper mineral(s) are oxidized.

Production and reserves

Indication of production None

Additional comments

Mineralized float can be traced about 100 feet along the strike of the zone.