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Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada

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Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada U.S. GEOLOGICAL SURVEY BULLETIN 1728-E ^» .^pHfc£... **- .t *,* -< ^*^** «41.iJ!F.>35** -'* ^fc** -- «» ',*«!5>?» '& -^m^cf' . ^--v^^* jpfc H ,4 L t .1 DEFINITION OF LEVELS OF MINERAL RESOURCE POTENTIAL AND CERTAINTY OF ASSESSMENT Definitions of Mineral Resource Potential LOW mineral resource potential is assigned to areas where geologic, geochemical, and geophysical charac­ teristics define a geologic environment in which the existence of resources is unlikely. This broad category embraces areas with dispersed but insignificantly mineralized rock as well as areas with few or no indications of having been mineralized. MODERATE mineral resource potential is assigned to areas where geologic, geochemical, and geophysical characteristics indicate a geologic environment favorable for resource occurrence, where interpretations of data indicate a reasonable likelihood of resource accumulation, and (or) where an application of mineral-deposit models indicates favorable ground for the specified type(s) of deposits. HIGH mineral resource potential is assigned to areas where geologic, geochemical, and geophysical charac­ teristics indicate a geologic environment favorable for resource occurrence, where interpretations of data indicate a high degree of likelihood for resource accumulation, where data support mineral-deposit models indicating presence of resources, and where evidence indicates that mineral concentration has taken place. Assignment of high resource potential to an area requires some positive knowledge that mineral-forming processes have been active in at least part of the area. UNKNOWN mineral resource potential is assigned to areas where information is inadequate to assign low, moderate, or high levels of resource potential. NO mineral resource potential is a category reserved for a specific type of resource in a well-defined area. Levels of Certainty U/A H/B H/C H/D HIGH POTENTIAL HIGH POTENTIAL HIGH POTENTIAL M/B M/C M/D MODERATE POTENTIAL MODERATE POTENTIAL MODERATE POTENTIAL O Q. UNKNOWN LU CJ POTENTIAL cc L/B L/C L/D ID O CO LOW POTENTIAL LOW LOW POTENTIAL POTENTIAL N/D NO POTENTIAL B C LEVEL OF CERTAINTY A. Available information is not adequate for determination of the level of mineral resource potential. B. Available information suggests the level of mineral resource potential. C Available information gives a good indication of the level of mineral resource potential. D. Available information clearly defines the level of mineral resource potential. Abstracted with minor modifications from: Taylor, R. B., and Steven, T. A., 1983, Definition of mineral resource potential: Economic Geology, v. 78, no. 6, p. 1268-1270. Taylor, R. B., Stoneman, R. J., and Marsh, S. P., 1984, An assessment of the mineral resource potential of the San Isabel National Forest, south-central Colorado: U.S. Geological Survey Bulletin 1638, p. 40-42. Goudarzi, G. H., compiler, 1984, Guide to preparation of mineral survey reports on public lands: U.S. Geological Survey Open-File Report 84-0787, p. 7, 8. Chapter E Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada By EDWARD A. DU BRAY, H. R. BLANK, JR., and ROBERT L. TURNER U.S. Geological Survey DIANN D. GESE and ALBERT D. HARRIS U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1728 MINERAL RESOURCES OF WILDERNESS STUDY AREAS EAST-CENTRAL NEVADA AND PART OF ADJACENT BEAVER AND IRON COUNTIES, UTAH DEPARTMENT OF THE INTERIOR DONALD PAUL MODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1987 Library of Congress Cataloging in Publication Data Mineral resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada. (Mineral resources of wilderness study areas East-central Nevada and part of adjacent Beaver and Iron Counties, Utah ; ch. E)(U.S. Geological Survey Bulletin ; 1728-E) Bibliography: p. Supt. of Docs. No.: I 19.3:1728-E 1. Mines and mineral resources Nevada Weepah Spring Wilderness. 2. Geology Nevada Weepah Spring Wilderness. 3. Weepah Spring Wilderness (Nev.) I. du Bray, E. A. II. Series. III. Series: U.S. Geological Survey bulletin ; 1728-E. QE75.B9 no. 1728-E 557.3 s 86-600002 [TN24.N3] [553'.09793'14] For sale by Books and Open-File Reports Section U.S. Geological Survey Federal Center Box 25425 Denver, CO 80225 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 a part of the Weepah Spring (NV-040- 246) Wilderness Study Area, Lincoln and Nye Counties, Nevada. RESOURCE/RESERVE CLASSIFICATION IDENTIFIED RESOURCES UNDISCOVERED RESOURCES Demonstrated Probability Range Inferred (or) Measured Indicated Hypothetical i Speculative ECONOMIC Reserves Inferred Reserves MARGINALLY Inferred Marginal Reserves ECONOMIC Marginal Reserves SUB- Inferred Demonstrated Subeconomic Subeconomic Resources ECONOMIC Resources Major elements of mineral resource classification, excluding reserve base and inferred reserve base. Modified from U. S. Bureau of Mines and U. S. Geological Survey, 1980, Principles of a resource/reserve classification for minerals: U. S. Geological Survey Circular 831, p. 5. IV CONTENTS Summary 1 Introduction 4 Investigations by the U.S. Bureau of Mines 4 Investigations by the U.S. Geological Survey 4 Appraisal of identified resources 5 Assessment of potential for undiscovered resources 6 Geology 6 Geochemistry 6 Geophysics 7 Characteristics of ore deposit models 9 Characteristics of known deposits and occurrences Mineral and energy resource potential 10 References cited 10 PLATE 1. Maps showing mineral resource potential, geology, and aeromagnetic data for the Weepah Spring Wilderness Study Area In pocket FIGURES 1. Map showing mineral resource potential and generalized geology for the Weepah Spring Wilderness Study Area 2 2. Index map showing location of the Weepah Spring Wilderness Study Area 3 3. Complete Bouguer gravity anomaly map of the Weepah Spring Wilderness Study Area and vicinity 8 Contents V MINERAL RESOURCES OF WILDERNESS STUDY AREAS- EAST-CENTRAL NEVADA AND PART OF ADJACENT BEAVER AND IRON COUNTIES, UTAH Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada By Edward A. du Bray, H. R. Blank, Jr., and Robert L. Turner U.S. Geological Survey Diann D. Cese and Albert D. Harris U.S. Bureau of Mines SUMMARY Elevations in the study area range between 4,700 and 8,589 ft (feet). The USCS (U.S. Geological Survey) and the USBM The Seaman Range is underlain by carbonate sedi­ (U.S. Bureau of Mines) studied the mineral resource po­ mentary rocks of Silurian through Mississippian age and tential of 50,499 acres of the 61,137-acre Weepah Spring by Tertiary volcanic rocks (see geologic time chart at end Wilderness Study Area (NV-040-246), Lincoln and Nye of report). The former occur throughout the northeast­ Counties, Nev., at the request of the BLM (U.S. Bureau ern part of the study area and the latter throughout the of Land Management). In this report, the area studied southwestern part. Surficial deposits are extensive in the is referred to as the "wilderness study area" or the southern part. Volcanic and sedimentary strata are lo­ "study area." Field studies of the area were conducted cally offset along high-angle faults that are abundant in during summer 1984 by USBM geologists and during the area. spring 1984 and fall 1985 by USCS geologists, There are no mining districts nor any record of geochemists, and geophysicists. The FNB claims in the production from mineral deposits in the study area. The northeastern part of the study area have identified re­ FNB claims in the northeastern part of the area (fig. 2) sources of 3,300 tons of material grading 2.13 ounces sil­ include a 30-ft-deep shaft and a 146-ft-long adit from ver per ton. The mineral resource potential for metals which a small amount of rock was mined. In the south­ in the study area is high in the northwestern part, where ern part of the area iron-oxide-coated fractures along a undiscovered deposits of disseminated gold and as­ normal fault in silicified ash-flow tuff were prospected. sociated mercury may exist; moderate in two small areas A relatively large tract along the east edge of the study in the eastern and southern parts, where epithermal vein area (fig. 2), which comprises the Louie and Leone claims deposits of gold, silver, copper, lead, and zinc may exist; (Great Basin Geology-Energy-Minerals Joint Venture, and low for all metals in most of the study area (fig. 1983), has also been prospected. The Lucky Strike (1-9) 1). The resource potential for oil and gas, coal, uranium, prospect (Garside, 1973) in the northwestern part of the and geothermal energy is low. The mineral resource po­ area (not shown on fig. 2) includes iron-oxide-stained, tential for commodities with industrial applications is silicified breccia that is radioactive; the uranium content moderate in those parts of the study area underlain by of this material is low and does not indicate a uranium surficial deposits and carbonate rock. resource. The Red Head claims are in the northwestern The Weepah Spring Wilderness Study Area is part of the study area; a small quantity of mercury was about 115 mi (miles) north of Las Vegas. Caliente, Nev., mined from pits and trenches in the claims. There has about 40 mi southeast of the area (fig. 2), is the nearest been extensive prospecting by several mining companies large town.
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