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THE METHOD OF INVESTIGATION
BASIC CONCEPTS OF ECONOMIC GEOLOGY
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Arizona average grade base metal beryllium Bureau of Land Bureau of Mines by-product California chemical Colorado Colorado Plateau Commodity Data Summaries Company Comstock Lode concentration consumption containing costs demand discovery disseminated copper district domestic drilling early economic Forest Service geochemical geophysical high-grade Idaho igneous increase industrial minerals inferred iron known Land Management lead limestone Lode long tons low-grade measured and indicated mercury methods MF&P miles million acres million tons mineral commodities minerals exploration molybdenum Montana nation's Nevada nickel nonfuel mineral resources open pit operations orebody outcrops oxide Paley Report percent copper phosphate placer placer mining potash potential Precambrian precious metals production prospectors reconnaissance region relatively reserve estimates rock sampling sedimentary short tons silica silver sodium sodium carbonate sodium sulfate specific sulfide surface target area tonnage tungsten types U.S. Bureau U.S. Geological Survey underground uranium Utah veins West Western United zinc