Fall Creek uranium area

Region West, Northwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Cluster of germanium-bearing uranium occurrences in the Fall Creek coal area of southeastern Idaho.
Identified resources Identified resources for uranium.
Production None.
Status Unknown.
Estimated resources Estimate of 1,3000 short tons of U in about 6.5 million short tons of coaly shale, carbonaceous shale, and carbonaceous limestone (Vine, 1959).
Geologic maps Mitchell and Bennett (1979a), scale 1:250,000; Jobin and Schroeder (1964), scale 1:24,000.
Geophysical data Inadequate Rank 5 aeromagnetic data; rank 4 aeroradiometric data.
Favorable rocks and structures Most of the U-bearing rocks are restricted to a single stratigraphic zone in the upper part of the Bear River Formation, which is present throughout much of the northern part of the Caribou Mountains (Vine, 1959).
Deposits Fall Creek coal mine (MRDS dep_id: 10089388).
Evidence from mineral occurrences MRDS; analyses for U and Ge (Vine, 1959).
Geochemical evidence Anomalous Ge and Mo correlate with U (Vine, 1959).
Geophysical evidence None.
Evidence from other sources None.
Cover thickness and description Exposed at the surface and traced to depth.
Authors Reed S. Lewis, Virginia S. Gillerman, Christopher A. Tate, Jane M. Hammarstrom.
New data needs Geochemistry (especially Ge concentrations), geologic mapping, geophysics.
Geologic mapping and modeling needs Only one quadrangle in this areas is mapped at a scale of 1:24,000.
Geophysical survey and modeling needs High resolution, Rank 1 aeromagnetic and aeroradiometric coverage.
Digital elevation data needs Lidar in progress.