Nenzel Hill, Rochester District, Pershing Co., Nevada, USA
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The Rochester District is underlain by late Paleozoic and Triassic age volcanics. Common among these volcanics are rhyolites have frequently been altered to a quartz-sericite-pyrite mineral assemblage. Deformation and the intrusion of granite porphyry and other granitic lithologies occurred in the Cretaceous. It is most likely that the silver-gold mineralization developed during this later phase of volcanism.
Most of the productive ore deposits, worked in the initial pulse of activity in the district, are vein-type occurrences. However, in large areas the country rock is cut by networks of small mineralized fractures, the whole of which is known as stockworks. In the initial period of mining the stockworks were not economically viable except at the Nevada Packard mine south of Nenzel Hill.
Today, in a much different economic and technological environment the stockworks have gained supreme importance. Vikre (1981) noted that the low grade silver-gold ore in the area around Nenzel Hill amount to 100 million tons. Since the mid-1980's that area, including Nenzel Hill, has become part of a large open pit mine operated by Coeur Rochester. A subsidiary pit has been developed south of the Nenzel Hill area on the site of the former Nevada Packard Mine.
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38 entries listed. 25 valid minerals.
Localities in this Region
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Economic Geology (1981): 76: 580-609.