Unnamed (on peninsula south of Bruin Bay)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Fe; Zn
Other commodities Cd; Pb; Sn
Ore minerals chalcopyrite; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale B-3
Latitude 59.349
Longitude -154.0125
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on or near the north shoreline of the peninsula between Bruin Bay and Kamishak Bay, about two miles west of Contact Point. It probably is in the E1/2 sec. 32, T. 9 S., R. 28 W., Seward Meridian. The location is probably accurate within about 0.5 mile. It includes site no. 16 of Detterman and Cobb (1972), which is appreciably inland. A mineral locality described in Detterman and Reed (1980, fig. 6) may be about 0.5 mile farther east.

Geologic setting

Geologic description

This prospect appears to be in Jurassic quartz monzonite (Detterman and Reed, 1980; Detterman and Reed, 1964). A grab sample from an old prospect pit (Detterman and Reed, 1964, sample no. 120) contained more than 10 percent iron, 2 percent zinc, 0.05 percent each of copper and cadmium, and 0.01 percent each of lead and tin. Additional samples may have contained more copper, inasmuch as Detterman and Reed (1980, fig. 6) show the same or a nearby prospect as a copper deposit. The ore minerals are not described, but the assays suggest that the prospect contains sphalerite, chalcopyrite, and pyrite, or their oxidation products. The tin value may reflect its background level in the quartz monzonite; other prospects in Jurassic quartz monzonite in the area contain small amounts of tin (see, for example, Diamond Point, IL018).
Geologic map unit (-154.014627776809, 59.3483268035794)
Mineral deposit model Possibly polymetallic vein (Cox and Singer, 1986, model 22c).
Mineral deposit model number 22c?
Age of mineralization Probably Jurassic, the age of the host rock.

Production and reserves

Workings or exploration The deposit was explored by a prospect pit (Detterman and Reed, 1964).
Indication of production None