Geologic descriptionThis 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. |