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Mineral resources of the Devil's Playground (Wy-040-401) and Twin Buttes (Wy-040-402) wilderness study areas, Sweetwater County, Wyoming.

Lane ME
Denver, CO: U.S. Department of the Interior, Bureau of Mines, MLA 7-90, 1990 Jan; :1-12
In June 1990, the Bureau of Mines conducted a mineral investigation of the 16,704-acre Devil's Playground (WY-040- 401) and the 9,964-acre Twin Buttes (WY-040-402) Wilderness Study Areas in Sweetwater County, southwestern Wyoming. The investigation was requested by the Bureau of Land Management and authorized by the Federal Land Policy and Management Act of 1976 (Public Law 94-579). Using data from two drill holes 1 mi of the study areas and computer-generated isopach maps supplied by the Bureau of Land Management, inferred trona resources of about 1.2 billion tons are estimated to underlie the study areas at depths of between 2,200 ft and 3,100 ft. The trona beds are between 2 ft and 14 ft thick; additional information, including drilling, would be needed to verify the presence, delineate the trona beds, and determine purity (grade). No prospects or mining claims are in the study areas. Seven samples of the Bridger Formation in the Twin Buttes study area indicate no unusually high concentrations of elements. Oil shale is interbedded with the trona beds in the region; additional drilling is needed to determine if a resource exists beneath the study areas. The study areas are rated as having high potential for oil and gas, but no energy resources were identified as a result of this investigation. Of samples taken by the U.S. Geological Survey, one had a zeolite content of 80%; all other samples contained 10% zeolite or less. However, no zeolite resources were identified. Coal was not found in outcrops in the study areas; if coal exists beneath the surface, it would be at depths that would make it subeconomic.
Mineral deposits; Minerals
Publication Date
Document Type
Fiscal Year
Identifying No.
MLA 7-90
NIOSH Division
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, MLA 7-90
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division