Unnamed Occurrence (ARDF - SM068; southwest forks of Buckstock River), Aniak Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - SM068; southwest forks of Buckstock River)	- not defined -
Aniak Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 2,100 feet on the crest of an east-west trending ridge between two, unnamed, northeast flowing tributaries of the Buckstock River. It is about 0.4 mile west-northwest of hill 2280 near the southwest corner of section 35, T. 13 n., R. 53 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consist of quartz-sulfide veins and stringers that cut altered sandstone and siltstone of either the Upper Cretaceous, Kuskokwim Group or the Mesozoic Gemuk Group (Cady and others, 1955; M.L. Miller, W. Keith, and T.K. Bundtzen, unpublished field data, 1999). The occurrence is near the projected (fault?) contact between the Gemuk and Kuskokwim Groups. Pyrite is ubiquitous in the quartz veins and stringers; arsenopyrite and stibnite, which occur as isolated grains and blades, are less common. One grab sample of stibnite- and arsenopyrite-bearing vein material contained 14,800 parts per billion (ppb) gold, 5,700 ppb silver, 1,090 parts per million (ppm) antimony, 1.38 percent arsenic, and 13.7 ppm tungsten (W. J. Keith and T.K. Bundtzen, unpublished analytical data, 1999).
Workings: The U.S. Geological Survey investigated the site in 1999.
Alteration: Vein appears to be hydrothermally bleached.

Commodities (Major) - Ag, Au; (Minor) - As, Cd, Sb, W
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Other Databases

Link to USGS - Alaska:	SM068

Other Regions, Features and Areas containing this locality

References