Sourcing extraterrestrial Nuclear fuel

Em Qui 26 Fev 2004 22:50, Thor Olson escreveu:
> While Uranium is found in virtually all meteorites and
> stony bodies, the concentrations are nothing like that
> on earth due to the weathering into solution, aeolian
> separation, and magmatic concentration. This means
> you only logical choice is to bring it up from earth
> and keep enough of it on hand.

What about Thorium? Does Thorium ore need the same hydrological, tectonic and
volcanic processes to form, as in the case of Uranium ore?

BTW, I am curious, your knowledge of Geology and Mineralogy seems very deep.
(Or at least much deeper than mine. :-) Do you work in those areas?