Unnamed Occurrence (ARDF - ID128; north of Beaver Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID128; north of Beaver Creek)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on a north-trending ridge about 3 kilometers north of Beaver Creek, a tributary of the George River. The occurrence is at an elevation of about 1,400 feet, about 0.2 mile south-southwest of hill 1445 and near the northwest corner of section 18, T. 27 N., R. 43 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is an extensive pyrolusite-bearing bed or layer in sandstone, shale and volcaniclastic conglomerate of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The blue-gray zone of semi-massive pyrolusite is about 3 feet thick and can be traced for about 1,000 feet along strike. Grab samples of the sandstone with pyrolusite contained more than 0.5 percent manganese, 240 parts per billion (ppb) mercury, and 10.0 parts per million (ppm) molybdenum (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and the Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988).
Age: Late Cretaceous?

Commodities (Major) - Mn; (Minor) - Hg, Mo
Development Status: None
Deposit Model: Probably sedimentary Mn (Cox and Singer, 1986; model 34b).

Other Databases

Link to USGS - Alaska:	ID128

Other Regions, Features and Areas containing this locality

References