This uranium ore contains barely enough Uranium for power usage, let alone enough U-235 for any sort of weapon. You can get uranium ore from the huge mounds of tailings from old mines, there's plenty enough in there to make you a fair buck if you fancy carrying tonnes of it home and selling it on the web. Of course, if you're intent on extracting the metal, you could always pulverise the ore, extract the uranium by dissolving it in a solution of disodium carbonate and sodium hydrogen carbonate, then boiling off the water and reducing it with lithium/magnesium powder and the application of heat. Even then, without a tonne of ore, you won't get enough for a useful fuel mass, and you'll have to be waiting a pretty long time without a giant neutron reflecting container for it to go critical, and then you've got to moderate it enough to stop it from just melting into a pile of burning horrible uranium.
Of course, I say all this for informational purposes, inhaling uranium compounds is probably the least harmful part of producing a clandestine reactor. Did I mention elemental uranium is impossible to machine, is incredibly hard and it's dust likes to catch fire?
