Reed, Gauthier, and Cooper

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Zn
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-4
Latitude 60.9526
Longitude -148.238
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is at an elevation of less than 50 feet on the southwest shore of Hobo Bay. It is in the SE1/4 section 17, T. 10 N., R. 7 E., of the Seward Meridian. This is location 119 of Condon and Cass (1958), location 70 of Cobb and Richter (1972), location 78 of MacKevett and Holloway (1977), location 122 of Cobb and Tysdal (1980), and location S-149 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This prospect consists of a sulfide-bearing quartz vein in a shear zone in slate of the Upper Cretaceous Valdez Group (Cobb and Tysdal, 1980). The shear zone is about 3 feet wide, striking N30E to N60E and dipping 70NW. It has been traced along the surface for about 1,500 feet (Johnson, 1915). The vein pinches and swells from 3 to 14 inches wide and contains pyrrhotite, pyrite, chalcopyrite, sphalerite, and gold. Workings on the prospect consist of a 172-foot-long crosscut and a 25-foot-long adit with a 30-foot winze (Johnson, 1915).
Geologic map unit (-148.240076524111, 60.9520215104168)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein is in a shear zone that cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration Workings on the prospect consist of a 172-foot-long crosscut and a 25-foot-long adit with a 30-foot winze (Johnson, 1915).
Indication of production None

References

MRDS Number A010611

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 3/7/2000