Geological Survey Professional Paper, Numéro 820 |
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Autres éditions - Tout afficher
Geological Survey Professional Paper, Volume 775 Geological Survey (U.S.) Affichage du livre entier - 1949 |
Expressions et termes fréquents
Abstract of conclusions abundant Africa Alaska amounts areas arsenic average barite basins bauxite beds beryllium brines byproduct California Canada carbonate carbonatites chemical clay coal cobalt concentrations consumption contain copper deposits district dolomite Econ economic elements erals estimated evaporites exploration feet feldspar fluorine fluorspar Geochemistry Geology geothermal gold grade granite graphite hydrothermal hypothetical resources identified resources igneous rocks industry iron known limestone lithium magnesite manganese material metals metamorphic Mexico mica million tons mineral deposits MINERAL RESOURCES molybdenum monazite nickel niobium occur ounces oxide peat pegmatites percent petroleum phosphate phosphorite placers porphyry copper potential Precambrian production pyrite quartz range rare earths recoverable Rept reserves sand sandstone scandium sedimentary rocks sediments selenium shale short tons silicate silver sources speculative resources sphalerite sulfide sulfur Survey Bull Survey Prof thorium tion U.S. Bur U.S. Bureau U.S. Geol United uranium Utah veins volcanic zinc zones
