Sonny Jim Group

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb
Ore minerals chalcopyrite; galena; gold; pyrite; pyrrhotite
Gangue minerals calcite; chlorite; quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale KD
Quadrangle map, 1:63,360-scale D-4
Latitude 57.79
Longitude -153.209
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located on a point of land between the mouth of Terror Bay and Uganik Straits in sec. 32, T. 27 S., R. 24 W., of the Seward Meridian. Site location is accurate to within a few hundred feet.

Geologic setting

Geologic description

Three lenses and a few small veins of quartz, cutting Cretaceous metasedimentary rock, are exposed on the beach along a narrow lagoon. One lens on the west side of the lagoon ranges from 3 to 10 inches thick and is exposed for 200 feet. It strikes N. 75 W. and dips 85 south. Four parallel quartz stringers dip towards the vein at a distance of 50 to 100 feet. A second lens, located at the south end of the lagoon is 26 to 30 inches in thickness. It strikes N. 65 E. and dips 71 north. The third lens, located on the west side of the lagoon is 6 feet in thick and can be traced for 300 feet. The lens strikes N. 70 E. and dips 73 north. These lenses and stringers were sampled by Roehm (1936, PE 131-4) and assayed only trace amounts of precious metals.
Geologic map unit (-153.211242674085, 57.78926884168)
Mineral deposit model Chugach-type low-sulfide gold-quartz vein (Bliss, 1992; model 36a.1), turbidite-hosted gold vein.
Mineral deposit model number 36a.1
Age of mineralization Cretaceous or younger

Production and reserves

Workings or exploration Showings were exposed by open cuts at the time of Roehm's visit. Samples assayed only trace amounts of precious metals.
Indication of production None

Additional comments

Site is in Kodiak National Wildlife Refuge.

References