Unnamed Occurrence (ARDF - ID131; head of Bismarck Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID131; head of Bismarck Creek)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 2,300 feet, about 0.6 mile east of the Bismarck Creek prospect (ID130). It is about 0.6 mile south-southeast of hill 2475 and near the center of section 23, T. 27 N., R. 42 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a gossan of unknown size and orientation. Any original sulfides have been completely oxidized. The gossan is at the edge of a large area of hornfels derived from the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997; Miller, Bundtzen, and Gray, 2005). One grab sample of gossan from the occurrence contained 500 parts per million (ppm) copper, 140 ppm antimony, 500 ppb silver, and 20 ppm arsenic (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Pervasive oxidation.

Commodities (Major) - Cu; (Minor) - Ag, As, Sb
Development Status: None

Other Databases

Link to USGS - Alaska:	ID131

Other Regions, Features and Areas containing this locality

References