Unnamed (south of lower Butte Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-2
Latitude 63.041
Longitude -147.671
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,100 feet on the south wall of the valley of lower Butte Creek. The map site is about 1.2 miles northwest of VABM 5896 (Way), in the NW1/4 of sec. 1, T. 22 S., R. 1 W., of the Fairbanks Meridian. The location is accurate to within 1000 feet. This is location 36 of Clark and Cobb (1972).

Geologic setting

Geologic description

The area of this occurrence is underlain by Middle or Upper Triassic Nikoli Greenstone, Middle Triassic to Upper Pennsylvanian metasedimentary rocks, and numerous diabasic and gabbroic dikes and sills (Wilson and others, 1998). The occurrence is near a thrust fault that separates the two bedded units, and consists of pyrite and chalcopyrite disseminated in the metasedimentary rocks (Saunders, 1961).
Geologic map unit (-147.673255243567, 63.040547487476)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization The sulfide minerals probably are syngenetic with their Triassic-Upper Pennsylvanian host rocks.

Production and reserves

Workings or exploration Surface sampling only.
Indication of production None