Uranium in the basin is in the form of geochemical roll fronts associated with decrease in permeability in arkosic sandstones of the Wasatch Formation. Previously mined deposits were mostly oxidized, but recent discoveries are more extensive unoxidized bodies. Source of uranium is postulated to be Tertiary tuffs which once covered the area. Hydrolysis of the tuffs produced alkaline ground water which dissolved uranium and carried it as a tricarbonate. The transmissive sand units carrying the solutions were stained pinkish-red by hematite. Cores of unaltered arkose contain less than two ppm U, whereas cores from back in the altered zone contain 18 ppm U. Ore deposits are usually multiple C-shaped rolls, ranging in thickness from 2 to 20 feet, and several thousand feet in length. Protore up to 40 feet thick is often present on the unaltered side of a high-grade roll front. [Generalized sections are included.]

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