Unnamed Occurrence (ARDF - GO014; west bank of Togiak River), Bristol Bay Region District, Dillingham Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - GO014; west bank of Togiak River)	- not defined -
Bristol Bay Region District	- not defined -
Dillingham Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is close to the west bank of Togiak River. It is less than a mile downstream of the Kassianmute village site and about 3 miles upstream of the mouth of Pungokepuk Creek, an east tributary to Togiak River. The map site is in the NE1/4 of section 23, T 10 S, R 65 W, of the Seward Meridian. It is locality 2 of Hoare and Cobb (1977) and of Cobb and Condon (1972).
Geology: At this occurrence, Jurassic or Cretaceous pillow basalt is cut by a 12- to 15-inch-wide, at least 25-foot-long, quartz vein containing coarsely crystalline sphalerite, minor chalcopyrite, and pyrite (Hoare and Coonrad, 1961). A sample of oxidized sphalerite-rich vein material and its altered volcanic hostrock contained 3 ppm Ag, 110 ppm As, 0.35 ppm Au, 390 ppm Cd, 510 ppm Cu, 10.4 ppm Hg, greater than 5,000 ppm Mn, 6.8 ppm Mo, and greater than 1,400 ppm Zn (Kilburn and others, 1992). The occurrence is in lowlands along the Togiak River. Bedrock exposures are minimal, but parts of a gabbro intrusive are exposed across the river from this locality.
Workings: This occurrence has been reconnaissance mapped and sampled (Kilburn and others, 1992).
Age: Post Early Cretaceous. The host pillow basalt is part of a Jurassic to Lower Cretaceous sedimentary and volcanic assemblage (Hoare and Coonrad, 1978).

Commodities (Major) - Cu, Zn; (Minor) - Ag, Au, Hg, Mo
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	GO014

Other Regions, Features and Areas containing this locality

References