National Uranium Resource Evaluation: Hamilton Quadrangle, Idaho and Montana

The Hamilton Quadrangle was evaluated to identify geologic environments favorable for the occurrence of uranium deposits. Surface reconnaissance, low-level aerial radiometric traverses, and geochemical sampling were conducted in all geologic environments within the quadrangle. Data from an aerial radiometric survey by GeoLife International, Inc., and hydrogeochemical and stream-sediment reconnaissance data were evaluated, and followup work was conducted in selected environments. Determinations of favorability and deposit classification were based on similarities to known uranium occurrences. Tertiary strata in the Bitterroot Basin have been classified as favorable for sandstone-type uranium deposits. All other geologic environments were determined to be unfavorable, although several areas may warrant further examination.