Reply #127: Coal emissions into weapons...?

[SpoonFed]

Such claims are simply laughable: extracting enough fissile material, from coal ash, in order to make a nuclear weapon, would require enormous financial and energetic and technical resources -- with enormous facilities for chemical separation and isotopic enrichment

I'm not expert on the subject. Could you give me an approximate number in US dollars as to the enormous financial and energetic and technical resources required. Furthermore, could you give me a reasoned analysis as to whether this enormous endeaver would be on the same scale as... wait for it... would be required to build floating hover cities for Japanese evacuees?