Unnamed (a tributary to Tatina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Pb
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-1
Latitude 62.389
Longitude -153.058
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is located in a steep, south-flowing tributary of the Tatina River at an elevation of 3,350 feet (1,021 m) in the NW1/4, T. 27 N., R. 20 W., of the Seward Meridian. The reporter visited the site in 1984; at station no. 84BT117.

Geologic setting

Geologic description

This unnamed occurrence is a low sulfide, quart-carbonate vein system that strikes east-west near the contact between the Upper Triassic to Lower Jurassic, Tatina River Volcanics and the Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The mineralized zone occurs in a well-defined shear zone subparallel to bedding; it continues for at least 140 meters, and varies from 15 centimeters to one meter thick. Principle sulfides include pyrite and minor to trace chalcopyrite disseminated throughout the quartz-carbonate vein. Two samples taken across the vein averaged 230 ppm zinc, 314 ppm copper, and 90 ppm lead.
Geologic map unit (-153.060236722302, 62.3884117095275)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c

Production and reserves

Workings or exploration The reporter sampled the site in 1984. Two samples taken across the vein in separate locations averaged 230 ppm zinc, 314 ppm copper, and 90 ppm lead.
Indication of production None
Reserve estimates None.