Unnamed (near Main Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals arsenopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-3
Latitude 60.5219
Longitude -148.0833
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located in the SE1/4 section 17, T. 5 N., R. 8 E., of the Seward Meridian. It is situated on or near the southeast shore of Main Bay, about one-half mile from the head of the bay. This is location S-97 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This occurrence consists of stringers and lenses of quartz, from 3 inches to 1.3 feet wide, hosted in Orca Group sedimentary rocks of Tertiary age. The veins are exposed along strike for 70 feet. The veins consist of quartz containing arsenopyrite and pyrite. A grab sample collected by the U.S. Bureau of Mines contained 0.54 ppm gold, 0.40 ppm silver, and 7.9 percent arsenic (Jansons and others, 1984).
Geologic map unit (-148.085369162874, 60.5213252451149)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Tertiary or younger; the veins cut Orca Group rocks of Tertiary age.

Production and reserves

Indication of production None