Unnamed (southeast flank of Paxson Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals azurite; bornite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-4
Latitude 63.0064
Longitude -145.5712
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 4,500 feet approximately one-half mile southeast of the top of Paxson Mountain. It is in an east-flowing creek in the NE1/4SE1/4 section 14, T. 22 S., R. 11 E., Fairbanks Meridian. This site corresponds to locality S97 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

At this locality bornite occurs in 1-centimeter-wide quartz veins that cut Nikolai Greenstone metabasalt of Late Triassic age (Nokleberg and others, 1991). Copper minerals also occur in amygdules in metabasalt. A composite chip sample across a 6.5-foot zone of malachite and azurite in amygdules contained 2.6 percent copper and 20 parts per million silver (Nokleberg and others, 1991).
Geologic map unit (-145.573419409753, 63.0059781135382)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Late Triassic and Cretaceous.
Alteration of deposit The vesicular basalt host rock is altered in part to chlorite and epidote; copper mineral(s) are oxidized.

Production and reserves

Workings or exploration A composite chip sample across a 6.5-foot zone of malachite and azurite in amygdules contained 2.6 percent copper and 20 parts per million silver (Nokleberg and others, 1991).
Indication of production None

References