Unnamed (east of upper Little Yetna River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Hg
Gangue minerals chalcedony

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-6
Latitude 62.56245
Longitude -158.50469
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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).
Geologic map unit (-158.507109363513, 62.5617743626754)
Mineral deposit model Hot springs gold-silver? (Cox and Singer, 1986; deposit model 25a).
Mineral deposit model number 25a?
Age of mineralization 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 of deposit Silicification with deposition of chalcedony.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Indication of production None

References