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At the request of the U.S. Bureau of Land Management, approximately 54,480 acres of the Dry Valley Rim Wilderness Study Area (CA-020-615) were evaluated for mineral resources (known) and mineral resource potential (undiscovered). In this report, the area studied is referred to as the "wilderness study area" or simply "the study area;" any reference to the Dry Valley Rim Wilderness Study Area refers only to that part of the wilderness study area for which a mineral survey was requested by the U.S. Bureau of Land Management. The study area is underlain by horizontal to gently dipping middle Miocene volcanic rocks including andesite, lava and lahar deposits, basalt lava, and minor rhyolite ash-flow tuff. These strata form a gently west-dipping homocline bounded on the east by a north-trending normal fault located along Dry Valley Rim. The Red RockCanyon and WillowSprings areas contain an estimated 85 million tons of inferred subeconomic zeolite resources. These two areas have moderate mineral resource potential for zeolites. The zeolites occur as amygdule fillings in basaltic lava. Mining of zeolites in basalts is highly unlikely due to their low grade and difficulties and costs of extracting zeolites from basalts. A small area a long the southeast margin of the study area has low mineral resource potential forperlite. All three areas that have resource potential are located in and around prospects along the east boundary of the study area. The wilderness study area has no resource potential for geothermal energy or oil and gas. Character and Setting The Dry Valley Rim Wilderness Study Area is located in Washoe County, northwestern Nevada, and Lassen County, northeastern California (fig. 1). The area encompasses 54,480 acres managed by the U.S. Bureau of Land Management and is located about 40 mi east of Susanville. Access to the study area is provided by several dirt roads that join boundary roads. Elevations range from 3,800 to 6,200 ft; most relief occurs along Dry Valley Rim. The rim is 1,500 ft higher in elevation than the Smoke Creek Desert to the east. Areas west of the rim form gentle slopes and rolling hills. Steep rim rock walls and talus-covered canyons are common in the eastern part of the area, while most of the study area is gradually sloping, covered only by sparse sagebrush and native grasses. Identified Resources No metallic resources are identified. The Red Rock and Willow Springs areas contain 85 million tons of altered basalt containing amygdules that host an inferred subeconomic resource of zeolites. This basalt, more than 50 percent of which consists of amygdules filled with chabazite (a zeolite mineral), constitutes an identified subeconomic zeolite resource. Mineral Resources of the Dry Valley Rim Wilderness Study Area, Washoe County, Nevada, and Lassen County, California D1 The Broken Shovel claims, located along the southeast boundary of the study area, contain a 100,000-ton occurrence of perlite. While usable for lightweight aggregate, the deposit is too small for economic production. However, if considered for perlite production with other nearby deposits, this occurrence could become a subeconomic resource. Montmorillonitic clays are present in alluvial sediment in the Capricorn claims adjacent to the study area. Alluvial sediments contain more than 30 percent (volume) clays. The material is not usable as pozzolan and was not tested for other uses such as absorbency, oil clarification, or insecticide carrier. Mineral Resource Potential Amygdule-rich basalt that crops out in the Red Rock Canyon and Willow Springs areas has moderate resource potential for zeolites. Zeolite (chabazite) is present within middle Miocene basalt as amygdule-fill material (see appendix for geologic time chart). The areas of alteration that contain the zeolites are proximal to a north-trending fault that probably controlled the movements of alteration fluids. In both areas, zeolite-filled amygdules form more than 50 percent of the rock. The zeolite occurrence at Red Rock Canyon is the larger of the two; it contains about two to three times the volume present in the Willow Springs area. The quality of the zeolites around Red Rock Canyon and west of Willow Springs may be adequate for use as an absorbent in animal husbandry. These two areas have moderate mineral resource potential for zeolites. The area of silicic volcanic rocks around the Broken Shovel claims has low resource potential for perlite. The perlite is hosted in displaced blocks of what possibly originated as a rhyolite flow-dome complex. 120°30' 120° 15' 120°00' 40°20' Smoke Creek Desert APPROXIMATE BOUNDARY OF DRY VALLEY RIM WILDERNESS STUDY AREA (CA-020-615) Figure 1. Index map showing location of the Dry Valley Rim Wilderness Study Area, Washoe County, Nevada, and Lassen County, California. D2 Mineral Resources of Wilderness Study Areas Northeastern California, and part of Washoe County, Nevada Montmoriilonitic clay is present in alluvial sediment east of Red Rock Canyon at the Capricorn claims area east of the study area. Here the clays are mixed with silt-sized particles in the alluvium. This material is not suitable as a pozzolan but may qualify as fuller's earth, which is used as absorbents and for bleaching oils. The clay occurrence does not extend into the study area; therefore, there is no mineral resource potential for clay in the Dry Valley Rim Wilderness Study Area. The wilderness study area has no resource potential for geothermal energy (Higgins, 1981) or oil and gas.

Mineral resources of the Dry Valley Rim Wilderness Study Area, Washoe County, Nevada, and Lassen County, California