Uinta Basin

Region West, Southwest
Mineral systems
Deposit types
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Focus area based on the outline from Krahulec (2018b) covering the minor U producers and a number of U-Cu and other base metal, polymetallic, or ferrous prospects.
Identified resources Historical production of uranium.
Production The district has had minor U production from 19 small mines from 1949 to 1958. Total district metal production at modern metal prices is estimated at $22,000. The largest producer was probably the Eureka Group at just 40 tons of ore (Chenoweth, 1992; Krahulec, 2018b).
Status Past mining and current exploration (minor).
Estimated resources Unknown.
Geologic maps Hintze (1980), scale 1:500,000.
Geophysical data Rank 4 and 5 aeromagnetic coverage; Rank 5 aeroradiometric coverage.
Favorable rocks and structures The only productive mines are in the Upper Cretaceous Mesaverde Group and the Eocene Uinta Formation and most production was from the Uinta Formation (Chenoweth, 1990). Mineralization in the Uinta Basin district is hosted in cross-bedded or laminated, arkosic sandstone and is similar in character to both sedimentary rock-hosted stratiform Cu deposits and tabular sandstone U deposits. (Krahulec, 2018b).
Deposits Eureka Group.
Evidence from mineral occurrences UMOS (Utah Geological Survey, 2021).
Geochemical evidence Geochemical sampling of some old U-Cu prospects in the Eocene Uinta Formation have shown a metal assemblage of strongly anomalous Mo, Cd, Cu, Ag, Sb, As, U, and Re (Conn and Krahulec, 2008).
Geophysical evidence Unknown.
Evidence from other sources See Krahulec (2018b).
Cover thickness and description Variable.
Authors Stephanie Mills.
New data needs Geologic mapping and geophysics.
Geologic mapping and modeling needs Geologic mapping.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and radiometric surveys.
Digital elevation data needs Lidar adequate only over northern portion of focus area; inadequate elsewhere.