Uranium

The planet Ruusan had significant deposits of uranium, as did Sullust's moon, Sulon. Moorjhone was home to uranium mines run by Rim Commercial Mining which supplied uranium to power plants from Coruscant to the Tingel Arm during the Clone Wars. Han Solo once won a half-million credit uranium mine in a sabacc game. However, the accounts were so crooked that he was lucky to escape prosecution when the shareholders investigated the business. At some point, he owned a two-million-credit uranium mine that he lost playing sabacc.

Hoersch-Kessel ion engines, the most popular ion drive in the galaxy, could be converted to draw power from uranium and other heavy metals by breaking down the elements. Starfighter fuel cells were comprised of refined radioactive metal mixes, including plutonium and uranium. The biology of an Exogorth contained a uranium-based metabolism.

In The Star Wars Sourcebook, uranium is stated to be one of the best sources to power a Hoersch-Kessel ion drive. When the information was reprinted in the second edition of the sourcebook, this information was updated to state that the Hoersch-Kessel ion drive could be converted to draw power from uranium and other heavy metals but was primarily powered by power cells and power generators.