Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Other commodities Au
Ore minerals bornite; chalcocite; chalcopyrite; chrysocolla; digenite; pyrite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-4
Latitude 63.0909
Longitude -145.6322
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of 3,600 feet at the north flank of Paxson Mountain about 0.1 mile south of mile 7 on the Denali Highway. It is in the SE1/4SE1/4 section 16, T. 21 S., R. 11 E., Fairbanks Meridian. The prospect corresponds to locality 10 in Rose and Saunders (1965) and to locality S89 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

At this prospect Nikolai Greenstone of Late Triassic age contains copper minerals that occur in and adjacent to veins, pods, and amygdules of quartz and epidote (Rose and Saunders, 1965). The veins and pods are generally less than 1 inch wide and can be traced only for a few feet. Bornite, digenite, chalcocite, chalcopyrite, chrysocolla, and pyrite are present in a few places but generally are very sparse.
Geologic map unit (-145.634429520309, 63.0904803330312)
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 to chlorite, prehnite, and epidote.

Production and reserves

Workings or exploration The prospect was discovered in 1962 by Jack Tripp of Fairbanks, who dug by hand trenches and pits. A grab sample of quartz veins containing chalcopyrite and bornite assayed 1.38 percent copper, trace gold, and 0.30 ounce of silver per ton (Saunders, 1962 [PE 68-09]). A sample collected by the U.S. Geological Survey contained 2 percent copper and 20 parts per million silver (Nokleberg and others, 1991).
Indication of production None


MRDS Number A011804


Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 6/17/2002