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Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada

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Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada ^gfTor:^- U.S. GEOLOGICAL SURVEY BULLETIN 1728-A 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 inteipretations 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 POTENTIAL L/B L/C L/D O C/3 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 A Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada By EDWARD A. DU BRAY and H. R. BLANK, JR. U.S. Geological Survey ROBERT H. WOOD II 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 COUNTY, UTAH DEPARTMENT OF THE INTERIOR DONALD PAUL MODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1986 For sale by the Branch of Distribution Books and Open-File Reports Section U.S. Geological Survey Federal Center Box 25425 Denver, CO 80225 Library of Congress Cataloging in Publication Data du Bray, E. A. Mineral resources, geology, and geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada. (Mineral Resources of wilderness study areas East-Central Nevada and part of the adjacent Beaver County, Utah ; A) (U.S. Geological Survey bulletin ; 1728-A) Bibliography: p. Supt. of Docs. No.: I 19.3:1728-A 1. Mines and mineral resources Nevada Worthington Mountains Wilderness. 2. Geology Nevada Worthington Mountains Wilderness. 3. Worthington Mountains Wilderness (Nev.) I. Blank, H. Richard (Horace Richard), 1929- II. Wood, Robert H. III. Title. IV. Series. V. Series: U.S. Geological Survey bulletin ; 1728-A. QE75.B9 no. 1728-A 557.3s 86-600135 [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 a part of the Worthington Mountains (NV- 040-242) Wilderness Study Area, Lincoln County, Nevada. RESOURCE/RESERVE CLASSIFICATION IDENTIFIED RESOURCES UNDISCOVERED RESOURCES Demonstrated Probability Range Inferred (or)' Measured Indicated Hypothetical Speculative ECONOMIC Reserves Inferred Reserves MARGINALLY Inferred + Marginal Reserves ECONOMIC Marginal Reserves Inferred SUB- 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 3 Appraisal of identified resources 5 Assessment of mineral resource potential 6 Geology 6 Geochemical investigations 6 Geophysical investigations 7 Aeromagnetic survey 7 Regional gravity survey 7 Aerial radiometric survey 9 Ore-deposit models 9 Characteristics of known deposits 10 Potential for undiscovered resources 10 References cited 11 PLATE In pocket 1. Maps showing mineral resource potential, geology, and aeromagnetic data for the Worthington Mountains Wilderness Study Area FIGURES 1. Map showing mineral resource potential and geology, Worthington Mountains Wilderness Study Area 2 2. Index map showing the location of the Worthington Mountains Wilderness Study Area 4 3. Bouguer gravity anomaly map of the Worthington Mountains and vicinity 8 Contents V MINERAL RESOURCES OF WILDERNESS STUDY AREAS- EAST-CENTRAL NEVADA AND PART OF ADJACENT BEAVER COUNTY, UTAH Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada By Edward A. du Bray and H. R. Blank, Jr., U.S. Geological Survey, and Robert H. Wood II U.S. Bureau of Mines SUMMARY structure in the area is the Freiberg thrust fault, along which are juxtaposed an allochthonous block of Ordovi­ The U.S. Geological Survey and the U.S. Bureau cian Pogonip Group limestone and Ordovician Eureka of Mines studied 26,587 acres of the Worthington Moun­ Quartzite, and younger, upper Paleozoic dolomitic rocks. tains Wilderness Study Area (NV-040-242) in Lincoln Mining in the Worthington Mountains Wilderness County, Nevada. The study of this acreage was requested Study Area has been restricted to very limited produc­ by the U.S. Bureau of Land Management. In this report, tion of silver-lead-zinc-copper ore, which contains minor the studied area is called "wilderness study area" or just gold, from limestone replacement deposits in the Smelter "study area." Field studies of the area were conducted shaft workings. Between 1919 and 1948, at least 12,600 during fall 1983 and spring 1984 by Bureau of Mines per­ Ibs (pounds) of lead, 7,600 Ibs of zinc, 2,359 oz (ounces) sonnel and during fall 1984 and spring 1985 by geologists of silver, and 274 oz of gold were produced from the and geophysicists of the Geological Survey. Metallic- Freiberg mining district within and just northeast of the mineral (Cu, Pb, Zn, Au, Ag, W) resource potential wilderness study area. Between the late 1970's and early within the study area is moderate, with level-B certainty, 1980's the Smelter shaft dump was processed for silver in the northernmost part, and it is low, with level-C cer­ (Tom Beam, oral commun., 1984). Identified metallic tainty, in the remainder of the area (fig. 1). Identified mineral resources in the study area are similarly restricted resources of commodities with industrial applications to the Smelter shaft workings. Additional mining has occur in the area. Energy resources are unknown; accord­ occurred in the Freiberg mining district (Kathleen shaft, ingly, their resource potential is considered low, with Roadside and Mountain View properties, and Zinc shaft), level-B certainty. where a small quantity of silver-lead-zinc-copper ore was The Worthington Mountains Wilderness Study mined from additional limestone replacement deposits; Area is about 120 mi north-northwest of Las Vegas, there is no recorded production from scheelite-bearing Nevada (fig. 1); Caliente, about 60 mi east of the area, tactile that also crops out in this area. is the nearest population center (fig. 2). Graded dirt roads Limestone metamorphosed by two monzogranite lead northward from Nevada State Route 25 to the study stocks is unmineralized to very weakly mineralized at the area. The Worthington Mountains is a 15-by-3-mi fault- ground surface in the northern part of the study area. block range flanked by Sand Spring and Garden Valleys The
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