Aerial gamma ray and magnetic survey: Powder River II Project, Gillette Quadrangle, Wyoming. Final report
The Gillette quadrangle in northeastern Wyoming and western South Dakota contains approximately equal portions of the Powder River Basin and the Black Hills Uplift. In these two structures, a relatively thick sequence of Paleozoic and Mesozoic strata represent nearly continuous deposition over the Precambrian basement complex. The Powder River Basin also contains a thick sequence of early Tertiary rocks which cover about 50% of the surface. A stratigraphic sequence from Upper Cretaceous to Precambrian is exposed in the Black Hills Uplift to the east. Magnetic data apparently illustrate the relative depth to the Precambrian crystalline rocks, but only weakly define the boundary between the Powder River Basin and the Black Hills Uplift. The positions of some small isolated Tertiary intrusive bodies in the Black Hills Uplift are relatively well expressed. The Gillette quadrangle has been productive in terms of uranium mining, but its current status is uncertain. The producing uranium deposits occur within the Lower Cretaceous Inyan Kara Group and the Jurassic Morrison Formation in the Black Hills Uplift. Other prospects occur within the Tertiary Wasatch and Fort Union Formations in the Pumpkin Buttes - Turnercrest district, where it extends into the quadrangle from the Newcastle quadrangle to the south. These four formations, all predominantly nonmarine, contain all known uranium deposits in the Gillette quadrangle. A total of 108 groups of sample responses in the uranium window constitute anomalies as defined in Volume I. The anomalies are most frequently found in the Inyan Kara-Morrison, Wasatch and Fort Union Formations. Many anomalies occur over known mines or prospects. Others may result from unmapped uranium mines or areas where material other than uranium is mined. The remainder may relate to natural geologic features.
- Research Organization:
- GeoMetrics, Inc., Sunnyvale, CA (USA)
- DOE Contract Number:
- EY-76-C-13-1664
- OSTI ID:
- 6242903
- Report Number(s):
- GJBX-82(79)(Vol.2)(Gillette)
- Country of Publication:
- United States
- Language:
- English
Similar Records
National Uranium Resource Evaluation: Gillette Quadrangle, Wyoming, South Dakota, and Montana
Aerial gamma ray and magnetic survey, Powder River II Project: the Newcastle and Gillette Quadrangles of Wyoming and South Dakota; the Ekalaka Quadrangle of Montana, South and North Dakota. Volume I. Final report
Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
AERIAL PROSPECTING
AERIAL SURVEYING
DATA
DATA COMPILATION
DATA FORMS
GAMMA SPECTROSCOPY
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INFORMATION
MAGNETIC SURVEYS
MAPS
NORTH AMERICA
NUMERICAL DATA
PROSPECTING
RADIOACTIVITY LOGGING
RADIOMETRIC SURVEYS
RESOURCES
ROCKY MOUNTAIN REGION
SPECTROSCOPY
TABLES
URANIUM DEPOSITS
USA
WELL LOGGING
WYOMING
X-RAY SPECTROSCOPY