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Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada

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Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada U.S. GEOLOGICAL SURVEY BULLETIN 1729-B or ^JSSr Chapter B Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada By DANIEL R. SHAWE, H. RICHARD BLANK, JR., BRIAN P. WERNICKE, GARY J. AXEN, HARLAN N. BARTON, and GORDON W. DAY U.S. Geological Survey RICHARD L RAINS U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1729 MINERAL RESOURCES OF WILDERNESS STUDY AREAS- SOUTHEASTERN NEVADA DEPARTMENT OF THE INTERIOR DONALD PAUL MODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director UNITED STATES GOVERNMENT PRINTING OFFICE: 1988 For sale by the Books and Open-File Reports Section U.S. Geological Survey Federal Center Box 25425 Denver, CO 80225 Library of Congress Cataloging-in-Publication Data Main entry under title: Mineral resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada. (Mineral resources of wilderness study areas southeastern Nevada ; ch. B) (U.S. Geological Survey bulletin ; 1729-B) Bibliography: p. Supt. of Docs, no.: I 19.3:1729-8. 1. Mines and mineral resources Nevada Mormon Mountains Wilderness. 2. Mormon Mountains Wilderness (Nev.). I. Shawe, Daniel R., 1925- . II. Series. III. Series: U.S. Geological Survey bulletin ; 1729-B. QE75.B9 no. 1729-B 557.3s 87-600429 [TN24.N3] [553'.09793'14] STUDIES RELATED TO WILDERNESS Bureau of Land Management Wilderness Study Areas The Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976) requires the U.S. Geological Survey and the U.S. Bureau of Mines to conduct mineral surveys on certain areas to determine the mineral values, if any, that may be present. Results must be made available to the public and be submitted to the President and the Congress. This report presents the results of a mineral survey of the Mormon Mountains (NV-050-161) Wilderness Study Area, Lincoln County, Nevada. CONTENTS Abstract Bl Summary Bl Introduction B3 Investigations by the U.S. Bureau of Mines B4 Investigations by the U.S. Geological Survey B4 Appraisal of identified resources B4 Mining history B4 Mines, prospects, and mineralized areas B4 Whitmore mine B4 Iron Blossom prospect B5 Limestone B5 Conclusions B5 Assessment of potential for undiscovered resources B5 Geology B5 Geologic setting B5 Description of rock units B7 Structure B7 Geophysics B8 Gravity data B8 Aeromagnetic data B8 Geochemical investigations and mineralized rocks Bll Analytical methods Bll Results of studies B12 Stream-sediment samples B13 Rock samples B13 Mineral and energy resources B16 Mineralized systems B16 Possible metallic mineral deposit types B16 Other mineral deposit types BIT Energy resources B18 References cited B18 Appendix B19 PLATE [Plate is in pocket] 1. Map showing mineral resource potential, generalized geology, geochemical sampling sites, and mine and prospect locations of the Mormon Mountains Wilderness Study Area and vicinity Contents FIGURES 1-6. Maps of the Morman Mountains Wilderness Study Area and vicinity showing: 1. Mineral resource potential and mine and prospect locations B2 2. Location B3 3. Generalized geology B6 4. Complete Bouguer gravity contours B9 5. Residual total-intensity aeromagnetic contours BIO 6. Residual upward-continued aeromagnetic contours B12 TABLE 1. Analytical data for mineralized rock samples collected near the Mormon Mountains Wilderness Study Area B14 VI Contents MINERAL RESOURCES OF WILDERNESS STUDY AREAS-SOUTHEASTERN NEVADA Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada By Daniel R. Shawe, H. Richard Blank, Jr., Brian P. Wernicke1 , Gary J. Axen2 , Harlan N. Barton, and Gordon W. Day U.S. Geological Survey Richard L Rains U.S. Bureau of Mines ABSTRACT southeastern Lincoln County, Nev., 60 mi (miles) northeast of The USBM (U.S. Bureau of Mines) and the USGS (U.S. Las Vegas (fig. 2). It is accessible by poor jeep roads from Geological Survey) studied the identified mineral resources Meadow Valley Wash on the west side and from the Carp- (known) and the mineral resource potential (undiscovered) Mormon Mesa road on the east side. The study area ranges of the Mormon Mountains Wilderness Study Area in altitude from about 3,440 ft (feet) at its western boundary to (NV-050-161), Nevada The Mormon Mountains Wilderness 7,414 ft at Mormon Peak. Study Area contains no identified resources; occurrences of The study area is near the south end of the Nevada- commercial-grade limestone of undetermined extent and Utah section of the Basin-range tectonic province. The minor deposits of sand and gravel are present. The study Mormon Mountains form a domelike structure, the core of area has high mineral resource potential for (1) copper, lead, which is ancient Precambrian crystalline rocks (see geologic zinc, silver, and (or) gold in its southern part and (2) copper, time chart in Appendix) that are exposed in small patches at lead, zinc, silver, gold, arsenic, and (or) antimony in its the west edge of the study area and just south of the study northern part (fig. 1). Part of the study area has moderate area. Doming of the mountains probably was a result of mineral resource potential for antimony. Two areas in the intrusion of igneous rocks sometime in Mesozoic-Tertiary central part of the study area have moderate mineral time. Cambrian clastic marine sedimentary rocks lie in resource potential for tungsten, molybdenum, and (or) tin. depositional contact upon the crystalline rocks. A series of The remainder of the study area has low mineral resource low-angle faults has episodically moved a thick section of potential for all metals. The study area has moderate energy Paleozoic marine sedimentary rocks, mostly carbonate resource potential for oil and gas, except for areas of low strata, onto the older rocks. Tertiary volcanic rocks, in part potential where significant hydrothermal activity has also emplaced on low-angle faults, occur along the north occurred. It has low mineral and energy resource potential for margin of the study area. Younger high-angle faults of manganese, barite, vermiculite, coal, and geothermal diverse orientations offset the low-angle faults and the rock energy. formations. The Whitmore mine, 1.3 mi south of the south end of the SUMMARY study area (fig. 1), produced a small amount of copper. The That part of the Mormon Mountains Wilderness Study Iron Blossom prospect, within 0.2 mi north of the north Area (23,690 acres) on which mineral surveys were margin of the study area, was probably developed for gold or conducted is in the core of the Mormon Mountains, in silver. The study area has occurrences of commercial-grade limestone and minor deposits of sand and gravel; however, neither of these is classified as an identified resource. The Mormon Mountains Wilderness Study Area has 1 Current address (Wernicke): Harvard University, Cambridge, high mineral resource potential for (1) copper, lead, zinc, MA 02138. silver, and (or) gold in its southern part and (2) copper, lead, 2Current address (Axen): Northern Arizona University, zinc, silver, gold, arsenic, and (or) antimony in its northern Flagstaff, AZ 86001. part (fig. 1). Areas of high potential are defined by metal- Mormon Mountains Wilderness Study Area B1 114°35' 114°30' 114°25' 37°05' 37°02'30" APPROXIMATE BOUNDARY OF THE MORMON MOUNTAINS y WILDERNESS STUDY AREA / (NV-050-161) 37°00' >JP- 36°57'30" - 36°55' Figure 1 (above and facing page). Summary map showing mineral resource potential and mine and prospect locations in the Mormon Mountains Wilderness Study Area and vicinity, Nevada. mineralized zones in shears and breccias along faults, by potential for all metals in the remainder of the study area is anomalously high metal concentrations in stream sediments, low, based on minimal evidence for their occurrence and lack by favorable host formations that are cut by abundant faults of favorable geologic environment. The Mormon Mountains and fractures, and by inferred centers of igneous intrusion. Wilderness Study Area has a moderate energy resource Metals were deposited in extensive hydrothermal systems potential for oil and gas based on presence of suitable that circulated metal-bearing fluids through faults and source rocks, maturation history, reservoir rocks, and fractures. Hydrothermal fluids had their sources in the structural and stratigraphic traps, except for areas of low postulated igneous intrusive rocks at depth, or they consisted potential where significant hydrothermal activity has of ground waters heated by the igneous intrusions. occurred. Part of the study area has moderate mineral resource The study area has low mineral resource potential for potential for antimony (fig. 1). Two areas in the central part of manganese, barite, and vermicultte. Deposits of these the study area have moderate mineral resource potential for commodities exist near the study area, but evidence is tungsten, molybdenum, and (or) tin (fig. 1). Areas of minimal for their occurrence within the study area. The moderate potential are defined by evidence similar to that geologic environment of the study area is not favorable for used to define areas of high potential, but the evidence is not the occurrence of geothermal and coal resources. Therefore as extensive nor as firmly established. Mineral resource the resource potential for these commodities is low. B2 Mineral Resources of Wilderness Study Areas Southeastern Nevada EXPLANATION 115°00' 114°00' [Energy resource potential for oil and gas is moderate, with certainty
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