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THE METHOD OF INVESTIGATION
BASIC CONCEPTS OF ECONOMIC GEOLOGY
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areas Arizona asbestos average grade base metal beryllium Bureau of Land Bureau of Mines California Canadian Shield carbonate chemical Colorado Colorado Plateau Commodity Data Summaries consumption containing demand discovery disseminated copper district early economic exploration federal government Forest Service gold deposits high-grade Ibid Idaho igneous increase industrial minerals inferred intrusive iron known Land Management lead limestone Lode long tons low-grade magma measured and indicated mercury Mexico MF&P million acres million ounces million tons mineral commodities Mineral Facts mineral reserves molybdenum Montana nation's nickel nonfuel mineral resources orebodies oxide Paleozoic Paley Report percent copper phosphate placer porphyry copper deposit portion potash Precambrian precious metals Public Land Law relatively reserve estimates sedimentary rocks short tons silica sodium carbonate sodium sulfate Southeastern sulfide surface tonnage tungsten U.S. Bureau U.S. Geological Survey uranium Utah utilization valuable mineral deposits veins West Western United Wyoming zinc