Unnamed (west-northwest of St. James Bay)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu; Pb; Zn
Other commodities Ba
Ore minerals pyrite; pyrrhotite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale C-5
Latitude 58.6439
Longitude -135.3762
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is 5 miles west-northwest of St. James Bay. It is at an elevation of approximately 2,000 feet, near the terminus of a glacier at the head of a creek draining into St. James Bay. It is in the NE1/4, SW1/4 section 20, T. 37 S., R. 61 E. of the Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

The prospect is in Silurian graywacke, turbidite, and limestone of the Point Augusta Formation (Brew and Ford, 1985). The deposit consists of pods and stringers of pyrite in siliceous argillite and in quartz veins, and of massive pyrite and pyrrhotite parallel to the foliation of laminated phyllite. U.S. Bureau of Mines samples contain up to 0.1 ppm gold, 1,600 ppm barium, 880 ppm copper, 570 ppm lead, and 710 ppm zinc (Clough and Redman, 1989). The general area is underlain by metamorphosed Silurian and Devonian clastic rocks, limestone, and volcanic units; Permian limestone and siltstone; and small plutons of Tertiary and Cretaceous granodiorite (Brew and Ford, 1985).
Geologic map unit (-135.378018175743, 58.6435690859825)

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

References