Exray

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite
Gangue minerals calcite

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale B-5
Latitude 58.4376
Longitude -135.5364
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of 2,800 feet on the crest of the northwest-trending ridge 2 miles west of Excursion Inlet. It is in the NW1/4 NE1/4 section 5, T. 40 S., R. 60 E. of the Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

The general area is underlain by deformed and metamorphosed Silurian or Devonian carbonate, clastic, and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). The deposit was discovered about 1909 (Brew and others, 1978). It is in calcareous argillite and consists of chalcopyrite-bearing calcite veins, breccia zones, and limestone-calcite breccia veins. Samples contain up to 4,300 ppm copper (Brew and others, 1978). Early workings included several surface pits and trenches along the veins. Wells and others (1986) show six prospects in this area.
Geologic map unit (-135.538215043803, 58.4372648850339)

Production and reserves

Workings or exploration This deposit was discovered about 1909 and development work consists of several surface pits and trenches.
Indication of production None

References