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Prospecting and Sampling Placers
How Bullion Is Paid for at the United States Mints
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albite alteration amount andesite appears bedrock beds biotite body breccia brucite Bureau of Mines calcite cent chlorite coarse County Creek crystals cubic yard depth dikes Dimick fault displacement dolomite dry washer east Elko County epidote Esmeralda Eureka quartzite feet feldspar Figure flow fractures G fault galena garnet geologic Gilmore Gulch formation granite granodiorite gravel Hales Hill hornfels Humboldt Range inches intrusive lavas limestone lower magnesite mass material metamorphism miles minerals mining district Nevada occurs operations ounces outcrop overlying oxidized phenocrysts placer deposits placer gold placer mining Pogonip Pogonip limestone porphyry present probably production prospect pyrite quartz latite quartzite rhyolite ridge riffles rocker rocks scheelite sericite shaft shale silver slope sluice sphalerite Stank surface Swarbrick Tertiary thickness tion Tonopah tremolite tuff Tungsten Tybo Canyon Tybo district Uncle Sam fault upper Valley veins western zone