Prospect, Probably inactive

Commodities and mineralogy

Main commodities As; Au; Cu; Fe
Ore minerals arsenopyrite; chalcopyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale A-4
Latitude 57.0732
Longitude -135.2679
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Cascade prospect is at an elevation of about 1,000 feet on the ridge just southwest of Billy Basin. The prospect is 0.2 mile northeast of the center of sec. 29, T. 55 S., R. 64 E. It is location P-114 of Bittenbender and others (1999); location 54 of Cobb (1972, 1978); and MAS no. 0021140021 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.

Geologic setting

Geologic description

The rocks in the vicinity of the Cascade prospect consist of Jurassic and Triassic, amphibolite and greenschist surrounded by rocks of the Jurassic and Triassic, Khaz Formation which consists of graywacke, greenschist, metachert, phyllite, and minor limestone (Loney and others, 1975).
As originally described by Knopf (1912), the Cascade prospect consists of shattered quartzite cemented by quartz veinlets with pyrrhotite, arsenopyrite, and rare chalcopyrite. Cobb (1978) infers gold in the deposit. There has apparently been little work on the deposit since before 1912 and while Bittenbender and other (1999) show the prospect on a location map, they do not mention it otherwise.
Geologic map unit (-135.269661750396, 57.0728380974241)
Mineral deposit model Shattered quartzite with pyrrhotite, arsenopyrite, and chalcopyrite.
Age of mineralization Triassic or younger based on the age of the host rocks.

Production and reserves

Workings or exploration Apparently only surface sampling.
Indication of production None


MRDS Number A013301


Reporters Donald Grybeck (U.S. Geological Survey)
Last report date 5/5/2005