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The Black Rock Desert Wilderness Study Area (NV-020-620) covers 319,594 acres in western Humboldt County, Nev. The U.S. Bureau of Land Management requested mineral surveys on 174,300 acres of the wilderness study area. An appraisal of identified resources (known) and assessment of the mineral resource potential (undiscovered) of the smaller area, hereafter designated the study area, are described in this report. Geologic, geochemical, geophysical, and mineral surveys indicate that the study area has moderate potential for gold, silver, mercury, lithium, and geothermal resources and low potential for oil and gas resources although no mines or prospects were identified within this area. Character and Setting The Black Rock Desert Wilderness Study Area consists of a flat playa within the Black Rock Desert that is bounded by the Black Rock Range to the west and by the Jackson Mountains to the east. A group of north-trending hills, buttes, and mesas borders the study area to the northwest. Elevations on the playa range from 3,900 to 4,000 ft. The Black Rock Desert is in the Basin and Range physiographic province. This province is characterized by northwest-trending fault-bounded mountains separated by wide parallel valleys. The Black Rock Desert is within a down-dropped fault block that is filled by Cenozoic sediments. Hills and mesas northwest of the study area are underlain by TriassicJurassic (see appendix for geologic tine chart) phyllite, quartzite, and limestone, Cretaceous quartz monzonite, and Miocene-Pliocene tuffs, rhyolite flows, and basalt.

Mineral resources of the Black Rock Desert Wilderness Study Area, Humboldt County, Nevada