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Porphyry-type gold mineralization of late Neogene age at the Zule volcanic center, Sierra County, California
(University of Nevada, Reno, 1992)
The volcanic setting, alteration, geochemical characteristics, and association of gold with quartz stockwork, hydrogene iron oxides, and hypersaline fluid inclusions suggest this is a shallowly-exposed porphyry gold system.