Paxson's

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcocite; chrysocolla

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-4
Latitude 63.0372
Longitude -145.5638
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 3,500 feet on the northeast flank of Paxson Mountain, 1 mile west of Mud Lake. It is on the steep east slope of an abandoned glacial stream channel in the NW1/4SW1/4 section 1, T. 22 S., R. 11 E., Fairbanks Meridian. The occurrence corresponds to locality 3 in Rose and Saunders (1965) and locality S93 in table 2 of Nokleberg and others (1991). It may be the prospect referred to by Martin (1920).

Geologic setting

Geologic description

Chrysocolla and chalcocite occur in highly vesicular, purplish-brown metabasalt of the Nikolai Greenstone of Late Triassic age (Rose and Saunders, 1965). The chrysocolla and chalcocite are most abundant near a fracture or fault at the north side of the exposure and appear to die out near the south side of the vesicular zone. The mineralized zone strikes N75E and dips about 35NW. Faulting apparently truncates the mineralized rock at both the north and south sides of the exposure. A chip sample across a thickness of 10 feet of the mineralized zone assayed 6.9 percent copper but no gold or silver (Rose and Saunders, 1965).
Geologic map unit (-145.566021814208, 63.0367793958469)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Late Triassic or Cretaceous.
Alteration of deposit The vesicular basalt host rock is altered to chlorite and epidote; copper mineral(s) are oxidized.

Production and reserves

Workings or exploration This occurrence has been prospected by hand-dug pits. A chip sample across a thickness of 10 feet of the mineralized zone assayed 6.9 percent copper but no gold or silver (Rose and Saunders, 1965). The grade is encouraging, but the mineralization appears to be limited in every direction except into the hillside.
Indication of production None

References