Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-2
Latitude 55.43934
Longitude -132.43142
Nearby scientific data Find additional scientific data near this location
Location and accuracy The only published location for this old prospect is a small-scale map and the description by Brooks (1902). He places it about a half mile north of the shore of Polk Inlet at an elevation of about 300 feet. There is a small island on his map in section 25, T. 74 S., R. 85 E. that can be identified on the modern 1:63,360-scale topographic map. The prospect is north of the island, probably within 1/4 mile of the center of the W1/2 section 24, T. 74 S., R. 85 E.

Geologic setting

Geologic description

The only description of this prospect is by Brooks (1902). The rocks in the vicinity include black, carbonaceous, pyritiferous slate that strikes N 60 W and dips 50 NE. The rocks are part of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996). A small cut exposes a (quartz?) vein up to 4 inches thick in crumpled slate. The vein contains pyrite and less than $1 per ton in gold (at $20.67 per ounce).
Geologic map unit (-132.433100070391, 55.438978299471)
Mineral deposit model Quartz? vein with low gold values.
Age of mineralization Unknown, other than that the vein is in Silurian or Ordovician slate.
Alteration of deposit Slate is crumpled near the vein.

Production and reserves

Workings or exploration Only a small cut.
Indication of production None

Additional comments

The Sealaska Corporation holds the subsurface rights to the land in the vicinity of this old prospect.