Unnamed (near Jack Bay)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals chalcopyrite; pyrite; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale A-7
Latitude 61.0279
Longitude -146.5533
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is within Jack Bay State Marine Park; it is on the west-facing slope of the ridge in the center of the east side of the park. It is at an elevation of about 400 feet in the SE1/4 section 1, T. 10 S., R. 8 W., of the Copper River Meridian. This prospect is probably located to within one-quarter mile. It is locality 38 of Cobb and Matson (1972) and locality 30 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Slate inclusions in greenstone of the Valdez Group contain pyrite, pyrrhotite, chalcopyrite and sphalerite (Johnson, 1919). The deposit was explored by a 25-foot adit. It may be a submarine volcanogenic deposit, similar to the deposit at the Midas mine (VA103).
Geologic map unit (-146.555324093787, 61.0273713301866)
Mineral deposit model Besshi massive sulfide deposit? (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b?
Age of mineralization Late Cretaceous, the age of the Valdez Group host rocks (Winkler and others, 1981 [OFR 80-892-A]).

Production and reserves

Workings or exploration The deposit was explored by a 25-foot adit.
Indication of production None

References