Dl Summary Dl Character and setting Dl Identified resources D3 Mineral resource potential D3 Introduction D4 Previous work D5 Investigations by the U.S. Bureau of Mines D5 Investigations by the U.S. Geological Survey D6 Appraisal of identified resources D6 Mining districts, mineralized areas, and identified resources D6 Base and precious metals D6 Uranium and vanadium D7 Coal D9 Oil and gas D9 Sand, gravel, and stone D9 Assessment of potential for undiscovered resources D9 Geology D9 Geochemistry Dll Mineral and energy resources D12 Base and precious metals D12 Uranium and vanadium D13 Coal D14 Oil and gas D15 Geothermal energy D15 References cited D15 Appendix