U.S. Geological Survey Professional PaperU.S. Government Printing Office, 1968 - Geology |
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Common terms and phrases
activity Alaska amounts of gold andesite argentite arsenopyrite basalt Basin batholith bedrock Belt bodies breccia byproduct calcite Cambrian chalcopyrite Colorado consists copper country rock County Creek district Cretaceous dikes discovered discoveries district produced district through 1959 duction early east faults feet Formation galena gangue gneiss gold deposits gold mining gold placers gold was produced gold-bearing granite granodiorite gravels Gulch Hill Idaho intruded Jurassic limestone Lindgren lode deposits lode gold lode mines miles minerals mining district Mountains Nevada occur oldest rocks ounces ounces of gold ounces of lode ounces of placer output overlain oxidized Paleozoic Pardee and Schrader placer deposits placer gold placer mining placer production porphyry Precambrian production through 1959 prospectors pyrite quartz monzonite quartz veins quartzite Range rhyolite rich River schist sedimentary rocks shale small amounts sphalerite sulfides Survey Bull Tertiary age tetrahedrite tion Total gold production Total production trict tuffs U.S. Geol zinc zone
Popular passages
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