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The Disaster Peak Wilderness Study Area (OR-003-153/ NV-020-859) is located in the south Trout Creek Mountains in southeastern Oregon and northern Nevada. At the request of the U.S. Bureau of Land Management, 30,195 acres of the Disaster Peak Wilderness Study Area were evaluated for mineral resources (known) and mineral resource potential (undiscovered). In this report, the area studied is referred to as the "Disaster Peak Wilderness Study Area" or the "study area." Field work for this report was done in 1986. No resources were identified within the study area. There is high and low potential for gold resources in quartz veins in the southern part and low potential for epithermal gold, silver, mercury, and uranium resources in the northeastern part of the study area. The study area has no potential for sand and gravel, oil and gas, or geothermal energy resources. Character and Setting The Disaster Peak Wilderness Study Area (OR-003153/NV-020-859) is located in the south Trout Creek Mountains in Harney and Malheur Counties, Oreg., and Humboldt County, Nev., about 23 mi west of McDermitt, Nev. (fig. 1). The study area contains the 7,000to 8,500ft-high crestline of the north-tilted plateau that forms the Trout Creek Mountains and caps the escarpments in the Publication authorized by the Director, U.S. Geological Survey, Mar. 15, 1988. southern and eastern parts of the study area. The rugged and steep southern escarpment, which crests at Orevada View (8,506 ft) and Disaster Peak (7,781 ft), has more than 3,000 ft of relief to the Kings River Valley south of the study area. The southern part of the study area is underlain by Cretaceous (see appendixes for geologic time chart) granitic rocks (fig. 2). An approximately flat-lying sequence of Tertiary volcanic and pyroclastic flows unconformably onlaps the granitic rocks and is exposed within most of the remainder of the study area. The Long Ridge caldera, located just east of the study area, is a collapse structure resulting from the eruption of an ashflow tuff that forms the top of the flow sequence. The caldera is filled largely by tuffaceous sedimentary rocks. Numerous arcuate, northto northeast-striking caldera ring faults displace rocks in and near the northeastern part of the study area. Younger, north-northwest-striking normal faults that have large displacements cut rocks west of the caldera in the study area. County mining records show that more than 100 mining claims have been located in or near the study area since 1892 when the first claims were recorded. Current mineral exploration in and adjacent to the study area is primarily for gold and is centered in two areas containing claims and a prospect. Five mercury mines, including the producing McDermitt mine, are located in the Opalite mining district 10 to 20 mi east of the study area (fig. 1). The Opalite district also contains a uranium mine and several prospects. Two mines just southeast of the study area are active for clay minerals. Mineral Resources of the Disaster Peak Wilderness Study Area, Oregon and Nevada A1 APPROXIMATE BOUNDARY OF DISASTER PEAK ^ WILDERNESS STUDY AREA ^ (OR-003-15 3 / NV-020-859) LONG RIDGE CALDERA (Pan of McDermitt caldera complex)

Mineral resources of the Disaster Peak Wilderness Study Area, Harney and Malheur Counties, Oregon, and Humboldt County, Nevada