Moab's economy was originally based on agriculture, but gradually shifted to mining. Uranium and vanadium were discovered in the area in the 1910s and 1920s. Potash and manganese came next, and then oil and gas were discovered. In the 1950s Moab became the so-called "Uranium Capital of the World" after geologist Charles Steen found a rich deposit of uranium ore south of the city. This discovery coincided with the advent of the era of nuclear weapons and nuclear power in the United States, and Moab's boom years began.