Unnamed (south of Windy Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite; malachite
Gangue minerals calcite; diopside; wollastonite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale B-5
Latitude 63.46
Longitude -149.12
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,900 feet, about 0.6 mile southwest of Windy Creek changes from east to southeast. The site is at the NE corner of sec. 8, T. 17 S., R. 8 W., of the Fairbanks Meridian. The location is accurate to within 3000 feet. This is location 2 of Hickman and Craddock (1976).

Geologic setting

Geologic description

The country rocks in the area of this occurrence are Devonian to Ordovician interbedded argillite and limestone, intruded by small plugs of Upper Cretaceous to Lower Tertiary quartz diorite. The occurrence consists of chalcopyrite-bearing skarn zones adjacent to the stocks. Weathering zones has produced limonite gossan and malachite. Samples contain 1,900 ppm copper and 0.6 ppm silver (Hickman and Craddock, 1976).
Geologic map unit (-149.122290586312, 63.4595374625752)
Mineral deposit model Cu skarn (Cox and Singer, 1986; model 18b)
Mineral deposit model number 18b
Age of mineralization Probably Late Cretaceous or younger.
Alteration of deposit Weathering of skarn to produce secondary iron and copper minerals.

Production and reserves

Workings or exploration Surface sampling only. Samples contain 1,900 ppm copper and 0.6 ppm silver (Hickman and Craddock, 1976).
Indication of production None

References