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• W401505870 abstract "Mineral surveys were requested on 40,275 acres of the Mt. Stirling Wilderness Study Area (NV 050-401) located 50 mi northwest of Las Vegas and 8 mi south of Mercury, in the northern Spring Mountains of Nevada. Geologic, geochemical, geophysical, and mineral surveys of the wilderness study area conducted by the U.S. Geological Survey and the U.S. Bureau of Mines between 1983 and 1985 aided in evaluating the identified mineral resources and the mineral resource potential (undiscovered) of the area. Mines outside the study area that have produced gold, silver, and base metals are located along major faults and fracture systems that are present in the study area. An extensive and locally intense zone of alteration developed in siliclastic and minor carbonate rocks is associated with the Grapevine fault system on the western flank of the Spring Mountains and extends northward through the Johnnie mining district, one-half mile west of Grapevine Spring. Rock, stream, and soil samples from the zone of alteration associated with the Grapevine fault system are consistently anomalous in gold that is associated with arsenic, mercury, thallium, and antimony. Within the zone of alteration along this fault system the geologic setting and the assemblage of anomalous elements are similar to those at known sediment-hosted disseminated gold deposits elsewhere in Nevada. This zone of alteration has a high mineral resource potential for gold in this type of deposit. Another area of high mineral resource potential for gold occurs at Gold Spring (fig. 1) where anomalous amounts of gold are contained within shear zones in quartzite. An area of moderate resource potential for gold is present along part of the Wheeler Pass thrust where gold is associated with silicified limestone of the lower plate parallel to, and just below the thrust fault. One area that crosses the range north of Gold Spring has a low mineral resource potential for lead and zinc; another area along the crest of the range south of Mt. Stirling has a low mineral resource potential for manganese and zinc; both are associated with quartz-hematite vein systems in metamorphic rocks. A third area of low mineral resource potential for copper, lead, and zinc is present at Big Timber Spring where alteration is associated with the spring. An area south of Big Timber spring has an unknown mineral resource potential for gold along a poorly exposed normal fault system. Character and Setting The Mt. Stirling Wilderness Study Area encompasses 40,275 acres in the northern part of the Spring Mountains in southern Nevada (fig. 1). The northern Spring Mountains, have rugged terrain and high relief and are composed of Late Proterozoic to Permian (about 700 to 280 Ma; see appendix for geologic time chart) siliciclastic and carbonate sedimentary strata that were deposited on the Proterozoic and Paleozoic continental margin. These rocks were compressively folded and thrust faulted during the Mesozoic (about 240 to 66 Ma) and were subjected to high-angle normal faulting prior to and as part of extensional tectonism during the Tertiary (66 to 1.7 Ma). Quaternary alluvial deposits occur within the wilderness study area. Major mineralized and altered zones postdate Mesozoic metamorphism and thrusting and are related to high-angle normal faulting of Tertiary and (or) Quaternary (about 2 Ma to present-day) age. Metamorphic quartz-hematite veins, however, are preor syn-thrusting, occur along fairly discrete zones, and trend at high angles to the later high-angle normal faults. Extensive and locally intense acid leach zones Bl" @default.
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• W401505870 date "1987-01-01" @default.
• W401505870 modified "2023-09-26" @default.
• W401505870 title "Mineral resources of the Mt. Stirling Wilderness Study Area, Clark and Nye counties, Nevada" @default.
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• W401505870 doi "https://doi.org/10.3133/b1730b" @default.
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