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Mineral Resources of the Little Humboldt River Wilderness Study Area, Elko County, Nevada

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Mineral Resources of the Little Humboldt River Wilderness Study Area, Elko County, Nevada Mineral Resources of the Little Humboldt River Wilderness Study Area, Elko County, Nevada U.S. GEOLOGICAL SURVEY BULLETIN 1732-B Chapter B Mineral Resources of the Little Humboldt River Wilderness Study Area, Elko County, Nevada By ALAN R. WALLACE, ROBERT L TURNER, V.J.S. GRAUCH, JOSEPH L. PLESHA, M. DENNIS KROHN, and JOSEPH S. DUVAL U.S. Geological Survey PETER N. GABBY U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1732 MINERAL RESOURCES OF WILDERNESS STUDY AREAS LITTLE HUMBOLDT RIVER REGION, 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 Mineral resources of the Little Humboldt River wilderness study area, EIko County, Nevada. (U.S. Geological Survey bulletin ; 1732) (Mineral resources of wilderness study areas Little Humboldt River Region, Nevada ; ch. B) (Studies related to wilderness) Bibliography: p. Supt. of Docs, no.: I 19.3:1732-8 1. Mines and mineral resources Nevada Little Humboldt River Wilderness. 2. Little Humboldt River Wilderness (Nev.) I. Wallace, Alan R. II. Series. III. Series: Mineral resources of wilderness study areas Little Humboldt River Region, Nevada ; ch. B. IV. Series: Studies related to wilderness wilderness areas. QE75.B9 no. 1732-B 557.3 S [553'.09793'16] 87-600393 [TN24.N3] 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 Little Humboldt River Wilderness Study Area (NV-010-132), Elko County, Nevada. CONTENTS Summary Bl Abstract Bl Character and setting Bl Resources Bl Introduction B3 Investigations by the U.S. Bureau of Mines B5 Investigations by the U^S. Geological Survey B5 Appraisal of identified resources B5 Mining and prospecting history B5 Mines, prospects, claims, and mineralized areas B6 CR claim group B6 Snow claim group B7 JMC and Red claim groups B7 Other metallic mineral occurrences B7 Diatomite occurrence B7 Zeolite occurrences B8 Recommendations for further work B8 Assessment of potential for undiscovered resources B8 Geologic setting B8 Volcanic and volcaniclastic rocks B9 Surficial deposits BIO Structure BIO Geochemistry BIO Methods BIO Geochemical results BIO Geophysics Bll Gravity and aeromagnetics Bll Remote sensing Bll Aerial gamma-ray spectroscopy B14 Mineral and energy resources B14 Disseminated gold deposits B14 Deposit characteristics B14 Resource potential B15 Brush Creek area B15 Snowstorm Creek area B15 Areas adjacent to the South Fork of the Little Humboldt River B17 Additional areas B17 Zeolites B18 Barite B18 Tin B18 Other metals B18 Geothermal energy B19 Oil and gas B19 Sand and gravel B19 Contents References cited B19 Appendix B21 PLATE [Plate is in pocket] 1. Mineral resource potential and geologic map of the Little Humboldt River Wilderness Study Area FIGURES 1. Summary map showing mineral resource potential of the Little Humboldt River Wilderness Study Area B2 2. Index map showing the location of the Little Humboldt River Wilderness Study Area B4 3. Complete Bouguer anomaly map of the Little Humboldt River Wilderness Study Area and vicinity B12 4. Total-field aeromagnetic map of the Little Humboldt River Wilderness Study Area and vicinity B13 5. Map showing areas of possible hydrothermally altered rocks outlined on the basis of spectral analysis of Landsat Thematic Mapper (TM) color-ratio com­ posite images, Little Humboldt River Wilderness Study Area B16 VI Contents MINERAL RESOURCES OF WILDERNESS STUDY AREAS- LITTLE HUMBOLDT RIVER REGION, NEVADA Mineral Resources of the Little Humboldt River Wilderness Study Area, Elko County, Nevada By Alan R. Wallace, Robert L Turner, V.J.S. Grauch, Joseph L Plesha, M. Dennis Krohn, and Joseph S. Duval U..S. Geological Survey Peter N. Gabby U.S. Bureau of Mines SUMMARY trending mountains that are separated by broad valleys filled with alluvium. In the transition zone between the two Abstract terranes, the volcanic rocks partly to completely cover the older rocks. The Little Humboldt River Wilderness Study Area The wilderness study area is underlain by a complex, (NV-010-132) in northern Nevada is underlain by faulted interlayered sequence of volcanic rocks that were erupted volcanic rocks. The study area has no identified mineral between about 10 and 15 m.y. (million years) ago. The resources (fig. 1). Numerous mining companies are actively oldest rocks are rhyolitic flows and tuffs and lesser amounts exploring for gold in and around the wilderness study area. of ash-rich sedimentary rocks and andesitic flows, dikes, Different parts of the area have a high, medium, or low and tuffs. These rocks were cut by steep faults that mineral resource potential for disseminated gold deposits produced a large, north-trending basin. Ash-flow tuffs were and zeolites. Some areas have an unknown mineral erupted into this basin as it developed, forming the resource potential for bedded barite and disseminated gold widespread tuff of the Little Humboldt River. Subsequently, in rocks beneath the volcanic cover. The entire study area widespread shallow lakes covered surrounding areas, and has a low resource potential for uranium and thorium, large volumes of crystal-rich rhyolitic flows were erupted just diatomite, tin, arsenic, antimony, silver, and mercury, oil and west of the wilderness study area. About 10 m.y. ago, basalt gas, geothermal energy, and sand and gravel. flows were erupted near the northeastern edge of the study area. Active faulting during volcanic activity produced a Character and Setting complex relation between volcanic units and various fault systems. The Little Humboldt River Wilderness Study Area includes 40,000 acres (66 square miles) in western Elko Resources County, northern Nevada (fig. 2). It occupies a broad, sage-covered upland basin surrounded on the west, south, Different parts of the study area have a high, medium, and east by ridges. The study area can be reached by good or low resource potential for disseminated gold deposits and to very poor dirt roads from the south, west, and north. for zeolites in tuffaceous sedimentary rocks (fig. 1). The Elevations range from 5,079 ft (feet) to 7,266 ft, and the study area does not have any identified mineral resources. South Fork of the Little Humboldt River has incised a narrow Altered and fractured rocks, numerous quartz veinlets, canyon that longitudinally bisects the wilderness study area. and geochemical anomalies indicate that some of the older The study area is between the predominantly volcanic volcanic rocks at the southeast end of the study area near Snake River Plain volcanic province to the north and the Brush Creek and along the western margin near Snowstorm structurally complex Basin and Range province to the south. Creek have a high resource potential for disseminated gold Faulted and deformed older sedimentary and igneous rocks deposits. An area along the South Fork of the Little in the Basin and Range province are exposed in north- Humboldt River was hydrothermally mineralized and has a Little Humboldt River Wilderness Study Area B1 117°00' 116°45' I To Paradise Valley RODEAR FLAT (38 miles) i*» M/B(2) APPROXIMATE BOUNDARY OF THE LITTLE HUMBOLDT RIVER WILDERNESS STUDY AREA (NV-010-132) L/C (1) PPROXIMATE v BOUNDARY OF SNOW CLAI GROUP APPROXIMATE BOUNDARY OF CR CLAIM GROUP 41° 15' (45 miles) Figure 1 (above and facing page). Summary map showing mineral resource potential of the Little Humboldt River Wilderness Study Area, Elko County, Nev. B2 Mineral Resources of Wilderness Study Areas Little Humboldt River Region, Nevada EXPLANATION The study area has a low resource potential for [Except for parts of study area designated below as having high or mod­ uranium and thorium, oil and gas, diatomite, tin, arsenic, erate potential for commodity 2. the study area has a low mineral resource silver, mercury, and antimony, geothermal energy, and sand potential for commodity 2 (certainty level D). Entire study area has a low and gravel. The underlying pre-volcanic sedimentary rocks mineral resource potential for tin, uranium and thorium, sand and gravel have an unknown resource potential for bedded sedimen­ and oil and gas (certainty level D) and for arsenic, antimony, mercury, tary barite deposits as well as carbonate-hosted dissemi­ silver, geothermal energy, and diatomite (certainty level C)] nated gold deposits. Geologic terrane having a high mineral re­ source potential for commodity 1 (cer­ tainty level C or D) or for commodity 2 (certainty level D) Commodity shown on INTRODUCTION figure by number in parentheses Geologic terrane having a moderate mineral That portion of the Little Humboldt River resource potential for commodity 1 (cer­ Wilderness Study Area (NV-010-132) evaluated for tainty level C) or for commodity 2 (cer­ mineral resources and mineral resource potential, tainty level B) Commodity shown on figure hereafter referred to as the "wilderness study area"or by number in parentheses simply the "study area," covers 40,000 acres in western L/C Geologic terrane having a low mineral re­ Elko County, Nev. It is 50 mi (miles) northeast of source potential for commodity 1 (cer­ tainty level C) Commodity shown on figure Winnemucca, 50 mi north of Battle Mountain, and 5 mi by number in parentheses north of the small hamlet of Midas. Good to extremely poor dirt roads provide access to the north, west, and U/A Geologic terrane having an unknown mineral resource potential for commodity 1 (applies south sides; these roads connect with graded county to all parts of study area not designated as roads that lead west to Paradise Valley and south to having high, moderate, or low potential for Interstate Highway 80.
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