Mineral resources of the High Steens and Little Blitzen Gorge Wilderness Study Areas, Harney County, Oregon (original) (raw)
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Mineral resources of the Hawk Mountain Wilderness Study Area, Harney County, Oregon
1989
The Hawk Mountain Wilderness Study Area (OR-001-146A) encompasses approximately 69,640 acres along the Oregon-Nevada State line. The study area lies in southwestern Harney County, Oreg., approximately 20 mi southeast of Fields, Oreg., and 12 mi west of Denio, Nev. In this report, "study area" or "wilderness study area" refers to that area for which the mineral survey was requested by the U.S. Bureau of Land Management. Geologic, geochemical, and geophysical surveys of the study area were conducted by the U.S. Geological Survey and U.S. Bureau of Mines to evaluate the identified (known) mineral resources and to assess the mineral resource potential (undiscovered). No resources were identified in the study area. No mines or claims were observed in the study area nor are there any records of production or oil, gas, or geothermal leases for the study area. The study area is underlain by Tertiary volcanic rocks that are locally hydrothermally altered and silicified. In this region, altered rocks may host deposits of mercury, silver, and gold and industrial minerals (clay and zeolite). In
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
At the request of the U.S. Bureau of Land Management, approximately 25,163 acres of the Lower John Day (OR-005-006) and Thirtymile (OR-005-001) Wilderness Study Areas (17,831 and 7,332 acres, respectively) in northcentral Oregon were evaluated for identified mineral resources (known) and mineral resource potential (undiscovered). In this report, "wilderness study areas" and "study areas" refer to the 25,163 acres for which mineral surveys were requested. Fieldwork for this report was carried out in 1985 and 1986. No mines or mining districts are located inside the study areas; however, both areas are under lease for oil and gas. The Thirtymile Wilderness Study Area has 790,000 cubic yards of subeconomic gold resources averaging 0.003 troy ounces per cubic yard in two river bars along the John Day River. The Lower John Day Wilderness Study Area has five river bars that have gold occurrences. The Lower John Day and the Thirtymile Wilderness Study Areas both have a low mineral resource potential for placer gold in the canyon of the John Day River. In addition, part of the Thirtymile Wilderness Study Area has a low mineral resource potential for gold and (or) mercury in hydrothermal deposits. Both study areas have a low resource potential for oil and gas and no potential for geothermal energy resources. Mineral Resources of the Lower John Day and Thirtymite Wilderness Study Areas, Oregon A1 120°45' 120°30' 120° 15' APPROXIMATE BOUNDARY OF LOWER JOHN DAY WILDERNESS STUDY AREA (OR-005-006) Standard Kirkpatrick No. 1 well APPROXIMATE BOUNDARY OF THIRTYMILE WILDERNESS STUDY AREA (OR-005-001) Creek Micron No. 65 claim (abandoned)
Mineral resources of the North Sisters Rocks Wilderness Study Area, Curry County, Oregon
Open-File Report, 1988
Character and setting 1 Identified resources 1 Mineral resource potential 3 Introduction 3 Location and physiography 3 Previous and present investigations 3 Appraisal of identified resources 5 History 5 Mineral deposits 6 Assessment of mineral resource potential 6 Geology 6 Geochemical studies 7 Mineral resource potential 8 References cited 9 Appendixes 11 Definition of levels of mineral resource potential and certainty of assessment 12 Resource/reserve classification 13 Geologic time chart 14 FIGURES 1.
Mineral resources of the Orejana Canyon Wilderness Study Area, Harney County, Oregon
Character and setting 1 Identified resources 1 Mineral resource potential 1 Introduction 3 Area description 3 Previous and present investigations 3 Acknowledgments 5 Appraisal of identified resources 5 Mines and prospects, mining claims, and leases 5 Reserves and identified resources 5 Recommendations for further study 6 Assessment of mineral resource potential 6 Geology 6 Geochemical studies 6 Geophysical studies 7 Mineral and energy resource potential 8 References cited 8 Appendixes Definition of levels of mineral resource potential and certainty of assessment 12 Resource/reserve classification 13 Geologic time scale 14 FIGURES
1988
Bl Character and setting Bl Identified resources Bl Mineral resource potential B2 Introduction B3 Location and physiography B3 Previous and present investigations B3 Acknowledgments B5 Appraisal of identified resources B5 Mining history B5 Appraisal of mineral resources B5 Assessment of mineral resource potential B6 Geology B6 Geochemical studies B7 Geophysical studies B9 Mineral and energy resource potential B9 References cited Bll Appendixes Definition of levels of mineral resource potential and certainty of assessment B16 Resource/reserve classification B17 Geologic time chart B18 FIGURES 1. Index map showing location of North Pole Ridge Wilderness Study Area, Sherman and Gilliam Counties, Oregon B2 2. Map showing generalized geology, mineral resource potential, and location of claim group in North
Mineral resources of the Sheep Mountain Wilderness Study Area, Baker County, Oregon
1988
Bl Character and setting Bl Identified mineral resources Bl Mineral resource potential Bl Introduction B2 Location and physiography B3 Procedures and sources of data B3 Appraisal of identified resources B3 Assessment of mineral resource potential B4 Geology B4 Paleozoic and Mesozoic rocks B5 Tertiary rocks B6 Quaternary surficial deposits B6 Geochemistry B6 Methods B6 Results and interpretations B6 Geophysics B7 Gravity data B7 Aeromagnetic data B8 Radiometric data B8 Mineral resource potential B8 References cited B9 Appendixes Definition of levels of mineral resource potential and certainty of assessment B12 Resource/reserve classification B13 Geologic time chart B14 FIGURES 1. Index map showing location of the Sheep Mountain Wilderness Study Area, Baker County, Oregon B2 2. Map showing mineral resource potential and generalized geology of the Sheep Mountain Wilderness Study Area, Baker County, Oregon
Mineral resources of the American Flats Wilderness Study Area, Ouray and Hinsdale counties, Colorado
1987
Character and setting 1 Reserves, resources, and mineral resource potential 2 Introduction 4 Location 4 Investigations by the U.S. Bureau of Mines 4 Investigations by the U.S. Geological Survey 4 Geologic setting 5 Regional geology 5 Volcanic and intrusive rocks within the study area 5 Structure of the study area 6 Age of mineralization in the vicinity of the study area 6 Appraisal of identified resources 8 Assessment of potential for undiscovered resources 8 Geochemistry 8 Methods 8 Stream-sediment samples 9 Vein and rock chip samples 9 Geophysics 10 Scope of investigations 10 Gravity survey 10 Aeromagnetic surveys 10 Aeroradiometric survey 11 Potential for undiscovered mineral resources 12 Vein deposits 12 Breccia-pipe deposits 13 Porphyry-type molybdenum and copper deposits 14 Uranium deposits 14 Gravel deposits 14 Potential for undiscovered energy resources 15 Geothermal resources 15 Oil, gas, and coal resources 15 Conclusions 15 References cited 15 Appendix 19
Mineral resources of the Riordans Well Wilderness Study Area, Nye County, Nevada
1988
The Riordans Well Wilderness Study Area (NV-040-166) lies in the Basin and Range physiographic province of east-central Nevada (fig. 1). The U.S. Bureau of Land Management (BLM) requested that a mineral survey of 37,542 acres of the wilderness study area in Nye County, Nev., be conducted by the U.S. Geological Survey (USGS) and the U.S. Bureau of Mines (USBM) during 1983, 1985, and 1986. New geologic mapping of the area was completed, geochemical sampling of the area was conducted, geophysical characteristics were evaluated, and unpatented claim blocks in the area were investigated. There are no identified (known) mineral resources in the study area. Several types of undiscovered mineral resources may be present in the area. The mineral resource potential for each type is given below. The Riordans Well Wilderness Study Area has high energy resource potential for petroleum (fig. 2), although specific traps have not been identified. Almost half of the area has been leased for oil and gas (fig. 3). Moderate mineral resource potential is designated for three types of metal occurrence in two parts of the study area (fig. 2). The western part of the study area has moderate potential for tungsten and polymetallic base-metal (copper, lead, zinc, molybdenum, and bismuth) deposits in hydrothermal (low-to medium-temperature) replacement deposits in low-grade metamorphic rocks and for gold and silver in quartz veins associated with the replacement mineralization. The southeastern and eastern parts of the study area have moderate potential for gold in disseminated deposits associated with jasperoid occurrences.