Wallrock alteration vein structure and preliminary fluid-inclusion studies, Gooseberry Mine, Storey County, Nevada
AuthorSprecher, Terry Ann
Geological Sciences & Engineering
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The Gooseberry vein is a precious-metal, epithermal, calcite-quartz vein deposited in Tertiary volcanics along the east-west trending Gooseberry fault. Propylitized rocks envelop this fault and the north-northeast trending Red Top structures. The alteration pattern suggests that the Red Top structures may contain precious-metal mineralization at depth. Ore-shoot location is controlled by abrupt change in dip, major change in strike, and intersection with northeast-trending faults. The silver-to-gold ratio increases markedly with depth. Preliminary fluid-inclusion studies indicate a temperature of deposition between 240 and 245°C, probably under non-boiling conditions and hydrostatic pressure.
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