Unnamed (south of head of Twelvemile Arm)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals chalcopyrite; tetrahedrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-3
Latitude 55.33123
Longitude -132.73373
Nearby scientific data Find additional scientific data near this location
Location and accuracy This is locality 1 of Herreid and Rose (1966) and its location is accurate. It is about 1.2 miles south of the head of Twelvemile Arm and about 0.6 mile south-southwest of the center of section 25, T. 75 S., R. 83 E.

Geologic setting

Geologic description

At this site, a series of discontinuous quartz veins that strike N10E and dip 80NW contain small amounts of chalcopyrite and tetrahedrite (Herreid and Rose, 1966). A sample of a vein contained 0.06 ounce of gold per ton and 8.64 ounces of silver per ton. The veins cut massive, light-gray dolomite that is part of the Wales Group of Cambrian and older age. The workings consist of a 110-foot adit and several prospect pits.
Geologic map unit (-132.735378015682, 55.3308776505451)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Unknown, other than that the deposit consists of quartz veins that cut dolomite of Cambrian or older age.

Production and reserves

Workings or exploration The workings consist of a 110-foot adit and several prospect pits.
Indication of production None