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Uranium What is Uranium Uranium Geology Uranium Deposits Uranium Resources Uranium Mining Uranium Logs



Wyoming is home to the largest known uranium ore reserves in the United States. The state also ranks No. 1 in uranium production, accounting for about 43 percent (635,000 pounds U3O8) of all the uranium produced in the nation in 2018. Wyoming has benefited economically from the uranium industry through an influx of jobs, tax revenues, and overall economic growth.


Uranium is a highly valued energy resource found in numerous minerals and with major occurrences in Wyoming. Since the 1940s, this heavy metal has been used as a strategic military commodity and for nuclear power generation. Uranium is an important energy resource because a small quantity can produce a large amount of energy with relatively low carbon dioxide (CO2) emissions. Its radioactive properties were utilized in making the world’s first nuclear weapons, which brought an end to World War II. Since then, an entire industry has been built around its mining, processing, and utilization, with Wyoming playing a significant role in the industry when it comes to mining the ore.

Worldwide, the use of uranium for electrical generation has expanded and is expected to continue as demand for electricity increases. Because of the demand for this global commodity and its reserves, Wyoming is likely to benefit from an eventual increase in the state's production.

Uranium can be found in numerous minerals and occurs nearly everywhere on the planet, even in seawater. Uranium ore deposits occur in many of Wyoming's sedimentary basins, with smaller occurrences found in other geologic settings throughout the state. Uranium is usually found in porous sedimentary rocks such as sandstones, arkoses, or conglomerates, but some deposits are also associated with igneous and metamorphic rocks.

Uranium Facts

  • Symbol — U
  • Atomic number — 92 (number of protons in the nucleus)
  • Atomic weight — 238.3 atomic mass units
  • Density — 19.05 grams per cubic centimeter (g/cm3)
  • Group name — Actinide (belonging to the Actinium series)
  • Global abundance — (estimated)
    • Crustal rocks – 1.8 ppm* by weight (parts per million (ppm))
    • Sea water – 3.3 ppm*
    • Human body (average) – 1 ppm*

      *10,000 ppm = 1 percent; 1.8 ppm = 0.00018 percent

  • Common uranium ore minerals
    • Autunite – Ca(UO2)(PO4)2▪10-12(H2O)
    • Carnotite – K2(UO2)2(VO)4▪n(H2O)
    • Coffinite – USiO4
    • Tyuyamunite – Ca(UO2)2(VO4)2▪5-8H2O
    • Uraninite – UO2
    • Uranophane – Ca(UO2)2Si2O7▪6(H2O)

Recent Uranium Publications

Uranium:Geology and Applications

“Nuclear power is becoming more attractive as an energy source because it is clean and over the long run, may be more reliable than other fossil fuel resources,” says Robert Gregory, WSGS geologist.

Robert Gregory (307) 766-2286 Ext. 237