Thorium 232 is an extremely valuable element that is mined in the form of an ore from the planet Cascada. The Mugani, the local sentient species on the planet, are completely against mining on their world, but Human colonists used their advanced weapons to use the Mugani as a captive workforce. This situation presumably changes after the visit from the Andromeda Ascendant in "Be All My Sins Remembered".

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