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Character and setting 1 Mineral resource potential 1 Introduction 2 Location and physiography 2 Previous and present investigations 3 Acknowledgments 3 Appraisal of identified resources 3 Methods and scope of investigation 3 Mining history 3 Reserves and identified resources 3 Assessment of mineral resource potential 5 Geology 5 Rock units 5 Faults and evidence of alteration 6 Remote-sensing data on alteration 6 Geochemistry 7 Geophysical studies 8 Mineral and energy resources 9 Skarn, iron, and tungsten 9 Hydrothermal silver 9 Epithermal gold in fault breccias 9 Oil and gas 9 Limestone 10 Perlite 10 References cited 10 Appendixes Definitions of levels of mineral resource potential and certainty of assessment 15 Resource/reserve classification 16 Geologic time chart 17 FIGURES 1. Index map showing the location of the Bristol/Granite Mountains Wilderness Study Area,