I've never read what the concentrations might be on Mars? If you think there is viable quantities of uranium on Mars.... cool! At least Mars will never get hooked on cheap oil and then have to go through an unnecessary and painful withdrawal process**.
Mars will be all "Moonbase alpha" elevators and tunnels if underground... with I imagine
very,
very local economies managing local industrial and biological ecologies.
(** Once we on Earth are in the "electron economy" we should be OK though... whether that is Battery Electric Vehicles or more trains, trams and trolley buses remains to be seen).
PS: Check out who promoted the Polywell reactor. He's even got a part of the Star Trek Enterprise named after him! Let alone being mentioned in Niven and Pournelle's "Footfall" with the aliens using a Bussard Ramjet.)
Robert W. Bussard - Wikipedia, the free encyclopedia
Lastly, have you read the Mars trilogy by KSR?
