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Geology and ore deposits of the Alpine mining district, Esmeralda County, Nevada
AuthorPhariss, Edward I.
AdvisorPayne, Anthony L.
Geological Sciences and Engineering
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The Alpine mining district is located in Esmeralda County, west-central Nevada, 20 miles west of the town of Tonopah. Ore was found in the district shortly after major discoveries were made at Tonopah in 1900. Production began in 1903 and yielded $211,435 gross value before the mines were exhausted and closed in 1908. The Precambrian Wyman Formation, a dominantly pelitic unit, and Reed Dolomite, a massive, light weathering carbonate, crop out in the district with a maximum aggregate thickness of 1,634 feet. Intrusion of the sedimentary rocks by a Paleocene quartz monzonite stock imposed structural complications and a broad aureole of albite-epidote hornfels metamorphism over the area. Resulting mineral assemblages are quartz-actinolite- oligoclase, garnet-idiocrase-calcite, quartz-biotite-albite and biotite-muscovite-quartz-albite. The metasedimentary sequence is unconformably overlain by Quaternary alluvium.
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