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Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming

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Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming U.S. GEOLOGICAL SURVEY BULLETIN 1757-J WYOMING - " '-^ .,-*. <*,-*&. >. ,-r . * £&' rjf.«» V" V- ".' "' ' ^ffr ,' >* ' ^^i^^^^ ,^;.->> ^ ;^/l^-- ^ *f'^^v^ ^"^St^N^--^ f* ^r^f yr^^ " : ^'"' ,.;"- '^ "" ^ ,^|^/;! ^ ">C:^ .^;i|^^ ...___^^^r . i _ii^ .ziSBair^i. ^*Mufe£rffrife-r-^^*'- ^' -- ^ ^"^^ Chapter J Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming By ANTHONY B. GIBBONS, HARLAN N. BARTON, and DOLORES M. KULIK U.S. Geological Survey MICHAEL E. LANE U.S. Bureau of Mines U.S. GEOLOGICAL SURVEY BULLETIN 1757 MINERAL RESOURCES OF WILDERNESS STUDY AREAS SOUTHERN WYOMING DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. UNITED STATES GOVERNMENT PRINTING OFFICE: 1990 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 Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming / by Anthony B. Gibbons ... [et a!.]. p. cm. (Mineral resources of wilderness study areas southern Wyoming ; ch. J) (U.S. Geological Survey bulletin ; 1757-J) Includes bibliographical references. Supt. of Docs, no.: I 19.3:1757-J 1. Mines and mineral resources Wyoming Oregon Buttes Wilderness. 2. Oregon Buttes Wilderness (Wyo.) I. Gibbons, Anthony B. II. Series. III. Series: U.S. Geological Survey bulletin ; 1757-J. QE75.B9 no. 1757-J [TN24.W8] 557.3 s dc20 90-3903 [553'.09787'85] CIP 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 Oregon Buttes (WY-040-324) Wilderness Study Area, Sweetwater County, Wyoming. CONTENTS Abstract Jl Summary Jl Character and setting Jl Identified resources Jl Mineral resource potential Jl Introduction J4 Investigations by the U.S. Bureau of Mines J5 Investigations by the U.S. Geological Survey J5 Appraisal of identified resources J5 Mining history J5 Mineral resources J7 Energy resources J7 Conclusions J7 Assessment of potential for undiscovered resources J7 Geology J7 Geologic setting J8 Description of rock units J8 Geochemistry J9 Sample media and collection J9 Sample analysis J10 Results J10 Geophysics J10 Mineral and energy resource potential J12 Oil and gas J12 Coal J12 Uranium J13 Oil shale J13 Geothermal sources J14 Placer gold J14 Metals other than uranium and placer gold J14 References cited J15 Appendix J17 PLATE [Plate is in pocket] 1. Map showing mineral resource potential and geology of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming FIGURES 1-4. Maps of the Oregon Buttes Wilderness Study Area and vicinity: 1. Location J2 2. Mineral resource potential J3 3. Mining claims, oil and gas leases, and sample localities J6 4. Complete Bouguer gravity and generalized structure Jll Contents TABLES 1. Subsurface stratigraphy of the Oregon Buttes Wilderness Study Area J4 2. Oil and gas wells in the vicinity of the Oregon Buttes Wilderness Study Area J7 VI Contents MINERAL RESOURCES OF WILDERNESS STUDY AREAS-SOUTHERN WYOMING Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming By Anthony B. Gibbons, Harlan N. Barton, and Dolores M. Kulik U.S. Geological Survey Michael E. Lane U.S. Bureau of Mines ABSTRACT Tertiary-age sedimentary rocks (see geologic time chart in Appendix) are exposed in the Oregon Buttes The Oregon Buttes Wilderness Study Area Wilderness Study Area. The rock units are, from oldest to (WY-040-324) includes about 5,700 acres and is about 40 youngest, the Cathedral Bluffs Tongue of the Wasatch miles south of Lander, Wyo. The wilderness study area has Formation (lower and middle Eocene), the Laney Member of minor occurrences of placer gold and possible deeply buried the Green River Formation (middle Eocene), the Bridger coal and a moderate resource potential for oil and gas. Formation (middle Eocene), and the Arikaree Formation Energy resource potential is low for coal, oil shale, geother- (lower Miocene). mal energy, and uranium. There is a low mineral resource The wilderness study area is underlain by as much as potential for placer gold and all other metals, including 26,000 ft of sedimentary rocks ranging in age from Eocene uranium. near the surface to perhaps as old as Cambrian at the base (table 1). These rocks are probably underlain by crystalline SUMMARY basement rocks of Precambrian age like those exposed in the Wind River Range to the northeast. No faults or folds are present in the wilderness study Character and Setting area. However, the northern boundary of the study area lies near the boundary faults of the Wind River Range, being The Oregon Buttes Wilderness Study Area, 52 mi about 2 mi south of the Wind River thrust fault of Laramide (miles) northeast of Rock Springs and 40 mi south of Lander, age and about 3 mi south of the Continental fault of Tertiary Wyo., is reached by graded roads from Wyoming State and possibly Laramide age. Highway 28 at South Pass (fig. 1) and comprises approximately 5,700 acres. In this report, the Oregon Buttes Wilderness Study Area will commonly be referred to as "the Identified Resources wilderness study area" or simply as "the study area." The study area has no identified resources. Drill hole Elevations range from 8,612 ft (feet) at the highest point data indicate that coal of unknown quality and quantity is of the Oregon Buttes (fig. 2) to 7,314 ft at the southeast corner present beneath the wilderness study area, but it occurs at of the study area. The wilderness study area lies on the depths of 2,500 ft or more, making development unlikely. Continental Divide south of the Wind River Range. The climate is dry, and streams are intermittent, flowing only during spring snowmelt and after summer rainstorms. Mineral Resource Potential Investigations indicate a moderate resource potential for oil and gas because many reservoir and source rocks with known histories of production underlie the study area. Manuscript approved for publication June 25, 1990. Stratigraphic traps may exist in the subsurface of the study Oregon Buttes Wilderness Study Area J1 109°30' 109°15' 109°00' 108°45' _______108°30' I WIND RIVER BASIN Dickie Springs- Oregon Buttes mining district APPROXIMATE BOUNDARY OF THE OREGON BUTTES WILDERNESS STUDY AREA APPROXIMATE BOUNDARY OF THE HONEYCOMB BUTTES WILDERNESS STUDY AREA GREAT DIVIDE BASIN WYOMING 10 MILES Figure 1. Location of the Oregon Buttes Wilderness Study Area. Modified from Patterson and others (1987). area, but none of the dozen or more test wells drilled in the Several types of uranium deposits occur in the region immediate vicinity have been productive. 20-50 mi east of the study area in rocks similar in age and Coal is likely to exist in the subsurface of the study area, composition to those found in the study area. However, there but only two coal beds are indicated above a depth of 6,000 are no indications in the study area that any such deposits ft, the maximum depth at which a coal bed could constitute might be present. The resource potential for uranium is low. a resource. In view of the poor attributes of these coal beds, Two possible oil-shale-bearing units occur in the Green the energy resource potential for coal is low. River Formation within the study area. However, oil shale that J2 Mineral Resources of Wilderness Study Areas Southern Wyoming 108°52'30" FREMONT COUNTY SWEETWATER COUNTY APPROXIMATE BOUNDARY OF THE OREGON BUTTES 42° 15' WILDERNESS STUDY AREA 00" (WY-040-324) 3 MILES EXPLANATION Geologic terrane having moderate resource potential for oil and gas with certainty level C; low resource potential for coal, uranium, and geothermal energy with certainty level B; and low resource potential for oil shale, placer gold, and metals other than uranium and placer gold with certainty level C Applies to entire wilderness study area Levels of certainty Data indicate geologic environment and suggest level of resource potential Data indicate geologic environment and give a good indication of the level of resource potential Location of top of butte Elevation indicated Figure 2. Mineral resource potential of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming. was tested at two sites 10 mi east of the study area yielded The study area is without hot springs, and no other values far below commercial grade. Because of the low evidence of geothermal activity is present. The resource grade, the scarcity of oil shale beds, and the distance from potential for geothermal energy is therefore low. known areas of oil shale production, the potential for oil shale Placer gold is present in very low concentrations in the in the wilderness study area is rated as low. Arikaree Formation, which forms the cap rock of the Oregon Oregon Buttes Wilderness Study Area J3 Table 1. Subsurface stratigraphy of the Oregon Buttes Wilderness Study Area [Modified from Patterson and others, 1987. Thicknesses are approximate, estimated from well logs and from Love, 1970] Thickness Age Formation (feet) Tertiary Tipton Shale Member of the Green River Formation 240 Wasatch Formation (main body) 3,400 Fort Union Formation 6,000 Cretaceous Lance Formation Included with Fort Union.
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