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At the request of the U.S. Bureau of Land Management, approximately 12,290 acres of the El Dorado Wilderness Study Area (NV-050-423) and 14,994 acres of the Ireteba Peaks Wilderness Study Area (NV-050-438) were evaluated for mineral resources (known) and mineral resource potential (undiscovered). In this report, the areas studied are referred to as the "wilderness study area" or simply "the study area;" any reference to the El Dorado or Ireteba Peaks 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 areas are located in southern Nevada, approximately 30 mi south of Las Vegas, Nev. No mineral resources were identified in the El Dorado or Ireteba Peaks Wilderness Study Areas. The El Dorado Wilderness Study Area has high resource potential for gold, silver, copper, lead, and zinc in the southern part of the study area and moderate resource potential for gold, silver, lead, and zinc in the central part of the study area. There is low resource potential for these metals in the northern part of the study area. There is moderate resource potential for gold, zinc, cobalt, nickel, tungsten, niobium, and lanthanum and low resource potential for uranium in Precambrian rocks exposed in the southeastern part of the study area. The entire study area has low resource potential for sand and gravel. There is no potential for oil and gas resources. The Ireteba Peaks Wilderness Study Area has moderate resource potential for gold, silver, molybdenum, copper, tungsten, lead, and zinc in the northern and southern parts of the study area. There is low resource potential for uranium, thorium, niobium, lanthanum, and beryl along the western and northern parts of the study area. The entire study area has low resource potential for sand and gravel. There is no potential for oil and gas resources. Character and Setting The El Dorado and Ireteba Peaks Wilderness Study Areas lie in the El Dorado Mountains in southern Nevada (fig. 1). The areas comprise a rugged, mountainous terrain with elevations ranging from about 1,960 to 5,072 ft. The climate is arid, and vegetation is sparse, consisting of scattered grasses and sagebrush, creosote, Joshua tree, yucca, and several species of cactus including beaver tail, cholla, and barrel cactus. The El Dorado Wilderness Study Area is underlain by Miocene volcanic rocks faulted against Precambrian gneiss and schist. These rocks are intruded by granitic rocks along the southern boundary of the area. The rocks are cut by numerous north-trending faults. Dikes of varying composition also cut the rocks and have intruded along faults. The Ireteba Peaks Wilderness Study Area is underlain primarily by numerous dikes and small granitic stocks of Miocene age that intrude Precambrian schist, gneiss, and granite that underlies small parts of the study area.

Mineral resources of the El Dorado and Ireteba Peaks Wilderness Study Areas, Clark County, Nevada