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The Spaulding Wilderness Study Area (OR-001-139) is located along the east side of Guano Valley in southern Oregon. At the request of the U.S. Bureau of Land Management, 34,800 acres of the Spaulding Wilderness Study Area was evaluated for mineral resources (known) and mineral resource potential (undiscovered). In this report, the area studied is referred to as the "Spaulding Wilderness Study Area" or the "study area." There are no identified resources in the study area. Two groups of mining claims and a small prospect pit are located in the study area. No workings are found near the claims and no mining claims are current. There are no mineral leases and no oil and gas leases or lease applications. The northwestern and southeastern parts of the study area have low potential for epithermal (low-temperature) gold and silver (precious-metal) resources; trace amounts of gold were detected in alluvium in the northwestern part of the study area, and anomalous concentrations of elements commonly associated with precious-metal deposits were found in the southeastern part of the study area. The study area contains occurrences of pozzolanic tuff, perlite, and building stone. The sand and gravel occurrences in the study area are small and of poor quality. The study area has low potential for oil and gas. There is no potential for geothermal, uranium, or thorium resources. Harney Counties, Oregon, about 8 mi north of the OregonNevada State line (fig. 1). The study area encompasses 34,800 acres, mostly mesas and rolling hills east of Guano Rim. The northwestern part of the study area includes low-lying areas in the north end of Guano Valley. Access to the study area is via State Highway 140, about 10 mi south of the study area; gravel roads and jeep trails connect with State Highway 140 and encircle the study area. The nearest towns are Adel, Oregon, about 25 mi west of the study area, and Denio, Nevada, about 45 mi southeast of the study area. National antelope refuges and ranges are located south, west, and northwest of the study area. The study area lies in the northern Basin and Range province and encompasses part of the range between Guano Valley and Hawks Valley. Relief in the area is moderate; elevations range from about 5,250 ft in Guano Valley to about 6,250 ft on the mesas in the central part of the study area. The study area is underlain by flat-lying to gently dipping middle and late Miocene volcanic rocks (see "Appendixes" for geologic time chart), which include andesite lava and tuff breccia, ash-flow tuff, tuffaceous sedimentary rocks, and basalt. The western part of the study area is underlain mostly by andesite, which forms the steep scarp along Guano Rim. The central part of the study area is underlain by mesa-forming basalt and tuffaceous sedimentary rock. The eastern part is underlain by ash-flow tuff, which forms a terrain of gently rolling hills and low-lying bluffs. Character and Setting The Spaulding Wilderness Study Area (OR-001-139) is located along the east side of Guano Valley in Lake and Manuscript approved for publication April 1,1994. Identified Resources There are no identified resources in the Spaulding Wilderness Study Area. County mining records show that two groups of mining claims, apparently for the same site, were located in the study area. However, none of these claims is current and there are no mineral leases. No ongoing mineral exploration is known in or adjacent to the Mineral Resources of the Spaulding Wilderness Study Area, Lake and Harney Counties, Oregon E1

Mineral resources of the Spaulding Wilderness Study Area, Lake and Harney counties, Oregon