Economic Geology and the Bulletin of the Society of Economic Geologists, Volumen47

abundant alteration analyses andesitic ankerite anorthosite arsenopyrite bands bauxite beds bodies breccia Bull calcite Capitan carbon chalcopyrite chlorite Chott coal cobalt composition concentration copper County Cretaceous crystals deposits depth dikes district dolomite downhill dunitic east epidote fault feet field Figure folds foliation formation fractures galena geochemical Geol geologists gold grains granite hematite hydrothermal igneous ilmenite indicated intrusive Iron King Lake lignite limestone magma magnetite manganese material metals metamorphic method miles minerals mining occurs opaque origin outcrops oxide pattern percent porphyry Precambrian present probably pyrite quartz radioactivity region replacement rotation samples sandstone sedimentary sediments sericite shale shearing siderite silicate slump soil solutions specimens spectrographic sphalerite structure surface Table tbls temperature tennantite thickness tion tremolite tuffaceous U. S. Geological Survey uraninite uranium variations veinlets veins volcanic wall rock zinc zone