Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale B-2
Latitude 63.48
Longitude -147.6
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Cleopatra prospect is at an elevation of about 4,500 feet on the north wall of an east-flowing, unnamed tributary to the West Fork Glacier. It is about 1.6 miles south-southwest of VABM 5,756 (Fork), in the NW1/4 of sec. 5, T. 17 S., R. 1 E., of the Fairbanks Meridian. The location is accurate to within 0.5 mile. This is location 25 of Cox and others (1989).

Geologic setting

Geologic description

The country rocks in the area of the Cleopatra prospect include Upper Triassic, intensely deformed and metamorphosed, interbedded shale, argillite, sandstone, siltstone, and argillaceous limestone; and dikes, sills, and small plugs of altered diabase and gabbro (Wilson and others, 1998). These rocks in turn are intruded by Upper Cretaceous(?) and Lower Tertiary granite plutons. The deposit consists of stratabound disseminated chalcopyrite and pyrrhotite in the metasedimentary rocks.
Geologic map unit (-147.602274450135, 63.4795521604018)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization The disseminated sulfides are probably syngenetic with their Late Triassic host rocks.
Alteration of deposit The rocks are strongly leached and altered to gossan at the surface.

Production and reserves

Workings or exploration Rocks are stream-sediment sampling, ground EM and magnetic geophysical surveys were conducted in the mid-1970s (unpublished report for the New Alaska Syndicate, 1977).
Indication of production None