Unnamed Occurrence (ARDF - ID048; east of upper Little Yetna River), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID048; east of upper Little Yetna River)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is on hill 480, which overlooks an easterly fork of the Yetna River. It is near the center of the NE1/4, section 32, T. 29 N., R. 49 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a zone of bleached, silicified rhyolite of unknown extent; the silicification is largely chalcedony. The rhyolite is part of the Upper Cretaceous or Early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One grab sample of silicified rhyolite contained 100 parts per billion (ppb) gold and 60 ppb mercury (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Age: Unknown; the rhyolite of the altered zone is part of the Upper Cretaceous or early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994).
Alteration: Silicification with deposition of chalcedony.

Commodities (Major) - Au; (Minor) - Hg
Development Status: None
Deposit Model: Hot springs gold-silver? (Cox and Singer, 1986; deposit model 25a).

Other Databases

Link to USGS - Alaska:	ID048

Other Regions, Features and Areas containing this locality

References