Unnamed (in headwater fork of Crevice Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities As; Cu
Other commodities Fe; Mn

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-4
Latitude 67.3959
Longitude -151.6788
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the divide at the head of the northern, headwater fork of Crevice Creek, and about 5 miles south-southwest of the south end of Wild Lake. The occurrence is at an elevation of about 4,000 feet, about 0.4 5 mile east-northeast of the center of section 25, T. 30 N., R. 19 W., of the Fairbanks Meridian. This occurrence is the site of sample 372 in Dillon and others (1981 [AOF 133B]). The location is accurate.

Geologic setting

Geologic description

Dillon and others (1981 [AOF 133B]) collected a float sample of scoriaceous ferricrete at this location. The sample contains 2,000 ppm copper, 3,000 ppm arsenic, 5000 ppm manganese, and 20% iron. The ferricrete float covers an area of about 3 square meters and probably represents a weathered product of the underlying rocks. The occurrence is near the thrust contact between Devonian, Hunt Fork Shale and a unit of Devonian black calcareous phyllite and thin, dark limestone (Dillon and others, 1986).
Geologic map unit (-151.681542491142, 67.3954432489651)

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None