Aerial gamma ray and magnetic survey: Powder River II Project, Casper quadrangle, Wyoming. Final report

Technical Report · Wed Aug 01 04:00:00 EDT 1979

OSTI ID:5877937

The Casper quadrangle in central Wyoming lies within the Wyoming Basins Province and contains portions of several basins and uplifts of this province. Each of the basins contains a moderate to thick sequence of Phanerozoic strata. Precambrian rocks are exposed in the Sweetwater and Laramie Uplifts. Magnetic data appear to illustrate the relative depth to Precambrian basement and define the bundaries of the major structures very well. The Casper quadrangle has been extremely productive in terms of uranium mining, and contains three of the largest uranium mining districts in Wyoming. The uranium is found in Tertiary arkosic sandstones of the Wind River and Fort Union Formations. Other small districts are also present within the quadrangle in which uranium mineralization occurs in a variety of rocks. This project contains radiometric and magnetic data gathered by Texas Instruments, Inc. and geoMetrics. Despite an attempt at normalization, some minor differences exist between the two data sets. A total of 122 groups of sample responses in the uranium window constitute anomalies as defined in Volume I. These anomalies are largely scattered throughout the quadrangle, but tend to group within and around known uranium deposits. The anomalous samples are found most frequently associated with Cenozoic strata and Precambrian crystalline material.

• Research Organization: GeoMetrics, Inc., Sunnyvale, CA (USA)
• DOE Contract Number: EY-76-C-13-1664
• OSTI ID: 5877937
• Report Number(s): GJBX-158(79)(Vol.2)
• Country of Publication: United States
• Language: English

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GEOPHYSICAL SURVEYS
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