Geological, geochemical, stable isotope, and fluid inclusion characteristics of epithermal gold mineralization, Velvet District, Nevada

Reconnaissance geology and resources of Miocene diatomite, Trinity Pass area, Pershing County, Nevada

“…Tertiary rocks that underlie the diatomite-bearing tuffaceous sedimentary rock unit (Tts) are not well exposed in the central part of the study area and were not studied. The stratigraphy and lithology of pre-diatomite, Miocene sedimentary and volcanic rocks of the Velvet area, about 3 km south of the Tunnel Hill mine, were briefly described by Masterson and Kyle (1984). The pre-diatomite rhyolite flows, tuffs, and volcaniclastic sedimentary rocks of the Velvet area (Masterson and Kyle, 1984) are lithologically similar to units in the Trinity Pass area that I interpret to be younger than diatomite.…”

“…The stratigraphy and lithology of pre-diatomite, Miocene sedimentary and volcanic rocks of the Velvet area, about 3 km south of the Tunnel Hill mine, were briefly described by Masterson and Kyle (1984). The pre-diatomite rhyolite flows, tuffs, and volcaniclastic sedimentary rocks of the Velvet area (Masterson and Kyle, 1984) are lithologically similar to units in the Trinity Pass area that I interpret to be younger than diatomite. More geologic mapping and geochronologic studies are needed on to better define age relations and possible multiple cycles of rocks having similar features.…”

Metallic mineral resources in the U.S. Bureau of Land Management's Winnemucca District and Surprise Resource Area, northwest Nevada and northeast California

“…In the Trinity Mining District, brecciated quartz veins contain silver and gold in rhyolitic volcanic rocks (Lincoln, 1923;Johnson, 1977). In the Velvet Mining District, hydrothermal breccia and associated opal, chalcedony, and alunite, host gold-arsenic mineralized rocks in argillically altered Tertiary ash-flow tuff (Vanderburg, 1936a;Johnson, 1977;Masterson and Kyle, 1984). The mineralized rocks comprise veinlets, breccia fillings, and disseminations.…”