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At the request of the Bureau of Land Management, 12,900 acres of the Mount Limbo Wilderness Study Area (NV-020-201) were studied. In this report, the area studied is referred to as "the wilderness study area," or simply "the study area." The study area is located at the southern end of the Selenite Range in Pershing County, Nev. Geological, geochemical, geophysical, and mineral surveys were conducted by the U.S. Geological Survey and the U.S. Bureau of Mines from 1983 to 1986 to assess the mineral resource potential of the study area. No resources were identified in the area; however, the results of these surveys indicate the existence of a zone with moderate potential for the southern end of the study area. Elsewhere within the study area, the potential for gold and silver resources is low. Potential for geothermal resources is low in the entire study area. The granitic and volcanic rocks found in the study area are unfavorable for the accumulation of oil and gas. Character and Setting The study area is located at the southern end of the Selenite Range, approximately 20 mi southeast of Gerlach. Nev. (fig. 1). The topography is typical of the Basin and Range geomorphic province, with northsouth trending fault-bounded valleys and ranges. It is an area of high relief, ranging from 4,000 ft at the valley floor to 8.237 ft at the summit of Kumiva Peak. The study area comprises a granodiorite pluton of Cretaceous age (63 to 138 million years before present, or Ma) (see Geologic Time Chart, last page of report) bounded on the east and west by high-angle normal faults. Small felsic to mafic, aplitic to pegmatitic dikes intrude the pluton. Alluviated valleys flank the study area. Identified Resources Four prospects are located in the study area, but it contains no mines or active claims. Past interest centered on locally mineralized quartz veins, but they contained no identified mineral resources. Small tufa (calcareous sinter) deposits in the southwest part of the study area contain low concentrations of gold and silver and may be significant. Stone, sand, and gravel are present in the study area but are distant from anticipated markets. Mineral Resource Potential The southernmost part of the study area has moderate resource potential for gold and silver (fig. 2). Stream-sediment samples from this part of the study area contain anomalous concentrations of a suite of elements (arsenic, antimony, bismuth, cadmium, and

Mineral resources of the Mount Limbo Wilderness Study Area, Pershing County, Nevada