National uranium resource evaluation, Spokane Quadrangle, Washington and Idaho
The Spokane Quadrangle has been evaluated to delineate areas and determine geologic environments that could contain uranium deposits of at least 100 tons U/sub 3/O/sub 8/ in rocks at an average grade of not less than 100 ppM. Three environments meet these requirements and are classified as favorable in terms of the National Uranium Resource Evaluation. The delineation of the favorable areas is based, in part, on evaluation of reported uranium occurrences, geochemical sampling, radiometric information obtained from ground traverses, and reconnaissance aerial radiometric data. An environment favorable for authigenic uranium deposits is in the Mt. Spokane area, a past producing uranium area where meta-autunite is found in fractures and shears. In the northwestern corner of the quadrangle, Cretaceous plutonic rocks are favorable for magmatic-hydrothermal uranium deposits because of the high background uranium content, alteration attributed to hydrothermal processes, and a uranium occurrence in the same rocks a few kilometers north. An environment favorable for polymetallic vein-type deposits is in the eastern part of the quadrangle in a broad zone of west-northwest-trending faults in metasedimentary rocks of the Precambrian Belt Supergroup. Structurally controlled uraninite occurrences, previously dated as late Precambrian, are reported in five mines in the Coeur d'Alene district, along the east-central margin of the quadrangle.
- Research Organization:
- Bendix Field Engineering Corp., Grand Junction, CO (USA)
- DOE Contract Number:
- AC13-76GJ01664
- OSTI ID:
- 5369059
- Report Number(s):
- PGJ/F-009(82); ON: DE82012358
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
AERIAL SURVEYING
DATA ANALYSIS
EVALUATION
FEDERAL REGION X
GEOCHEMICAL SURVEYS
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
IDAHO
MATERIALS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RADIOMETRIC SURVEYS
RESOURCES
SURVEYS
URANINITES
URANIUM DEPOSITS
URANIUM MINERALS
USA
WASHINGTON