The parts of the Fifteen Mile Creek (OR-003-156), Oregon Canyon (OR-003-157), Twelve Mile Creek (OR-003-162), and Willow Creek (OR-003-152) Wilderness Study Areas for which mineral surveys were requested by the U.S. Bureau of Land Management encompass 51,290, 42,900, 25,340, and 26,130 acres, respectively, in southeastern Oregon. Throughout this report, reference to those specific areas, or to the "study areas" refers only to those parts of the wilderness study areas for which mineral surveys were requested. Field work was carried out during the summer of 1986 by the U.S. Bureau of Mines and the U.S. Geological Survey to appraise the identified (known) resources and assess the mineral resource potential (undiscovered) of the study areas.The four contiguous study areas lie near mineralized calderas to the south; however, none of the study areas have any identified resources. The southern part of the Fifteen Mile Creek study area has low potential and the southern part of the Oregon Canyon study area has moderate and low potential for mercury and uranium resources near ring fractures around a caldera. In the Oregon Canyon study area, the Manuscript approved for publication July 22, 1988.

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Character and setting 1 Identified resources 3 Mineral resource potential 3 Introduction 3 Location and physiography 3 Previous investigations 5 Present investigations 6 Acknowledgments 6 Appraisal of identified resources 6 Mining history 6 Prospects, claims, and mineralized areas 7 Assessment of mineral resource potential 7 Geology 7 Geochemical studies 9 Geophysical studies. 10 Mineral and energy resource potential 11 References cited 12 Appendixes Definition of levels of mineral resource potential and certainty of assessment 16 Resource/reserve classification 17 Geologic time chart 18 FIGURES