National Uranium Resource Evaluation: Eau Claire Quadrangle, Wisconsin and Minnesota

Technical Report · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:5297138

Delaney, H J; Fitzsimonds, M R; Bogart, L E; Silling, R M; Readdy, L A

The Eau Claire Quadrangle, Wisconsin and Minnesota, was evaluated to a depth of 1500 m to identify and delineate areas favorable for the occurrence of uranium deposits. The one uranium occurrence reported in the literature was located, described, and sampled. General geologic surface reconnaissance, ground radiometric measurements, and geochemical sampling were carried out in all geologic environments within the quadrangle. Aerial radiometric and hydrogeochemical and stream-sediment reconnaissance (HSSR) data were analyzed, and followup studies of anomalies were conducted. Potential environments were evaluated in the subsurface using descriptive logs of well sample cuttings. The results of this investigation suggested that there were no environments in Eau Claire Quadrangle that are definitely favorable for the occurrence of uranium deposits. Ten geologic environments have been identified as unfavorable. In the northeastern corner of the quadrangle, shear and fault zones were characterized by mylonite cut Precambrian units. Detailed evaluation of these areas was precluded because of glacial cover and because of the lack of subsurface data defining the character of these structures at depth. They exhibited numerous favorable characteristics but required further subsurface evaluation to adequately determine their favorability.

• Research Organization: Bendix Field Engineering Corp., Grand Junction, CO (USA). Grand Junction Operations; Golder Associates, Inc., Kirkland, WA (USA)
• DOE Contract Number: AC13-76GJ01664
• OSTI ID: 5297138
• Report Number(s): PGJ/F-071-82; ON: DE82019837
• Country of Publication: United States
• Language: English

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