National Uranium Resource Evaluation: Gillette Quadrangle, Wyoming, South Dakota, and Montana

Technical Report · Wed Sep 01 04:00:00 EDT 1982

OSTI ID:6749431

Dodge, Jr, H W; Robinson, K; Stanton, M R; Geer, K A

Uranium resources of the Gillette 1/sup 0/ x 2/sup 0/ Quadrangle, Wyoming, and a very small part of South Dakota, were evaluated to a depth of 1500 m (5000 ft) using available surface and subsurface information. Most of the uranium occurrences reported in the literature were searched for and many were found, sampled, and described. Some reported occurrences, however, were never located. As time permitted, ground radiometric surveys were made over areas showing Hydrochemical and Stream Sediment Reconnaissance (HSSR) or aerial radiometric anomalies. In general, ground radiometric surveys did not confirm either HSSR or aerial radiometric anomalies in the Powder River Basin portion of the quadrangle. Surface and subsurface studies outlined three areas favorable for uranium deposits. These areas are limited to certain rock units and depositional environments. The eastern- most area consists of the Lower Cretaceous Inyan Kara Group which contains marine, marginal-marine, and fluvial paleoenvironments. The second favorable area occurs to the west and up-section in the Upper Cretaceous marginal-marine Fox Hills Sandstone and the overlying fluvial Lance Formation. The third and westernmost favorable area is a small area of the Eocene Wasatch Formation. Unfavorable areas include areas underlain by Tertiary rocks, with the exception of the small area of the Wasatch Formation mentioned above; all Mesozoic rocks above the Lower Cretaceous Inyan Kara Group and below the Upper Cretaceous Fox Hills Sandstone and Lance Formation. All Paleozoic and older rocks and Tertiary intrusives are considered unfavorable.

• Research Organization: Geological Survey, Golden, CO (USA)
• DOE Contract Number: AC13-76GJ01664
• OSTI ID: 6749431
• Report Number(s): PGJ/F-060-82; ON: DE83001213
• Country of Publication: United States
• Language: English

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