Unnamed (east of upper Little Yetna River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Hg
Ore minerals iron oxide
Gangue minerals chalcedony

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-6
Latitude 62.52423
Longitude -158.63213
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on hill 540, about 1 mile east of the head of the Little Yetna River. The occurrence is in the SE1/4 SE1/4, section 12, T. 28 N., R. 51 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is in a zone of unknown size marked by Silicification of felsic volcanic rocks. The silicification is largely chalcedony. The volcanics are part of the Upper Cretaceous or early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Iron-oxide-rich gossan after sulfides was noted in part of the zone. Two samples contained 100 parts per billion (ppb) gold, and 140 ppb mercury (McGimsey and others, 1988).
Geologic map unit (-158.634548761729, 62.5235511011516)
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 is part of the Upper Cretaceous or early Tertiary, Yetna River volcanic field (Miller and Bundtzen, 1994).
Alteration of deposit Chalcedonic silicification; iron oxide alteration.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey in 1984 and 1985 (McGimsey and others, 1988).
Indication of production None

References