I came across this today. An interesting perspective. They didn't have figures for a Thorium fission reactor.
http://www.science.org.au/nova/101/101box01.htm
The table below provides a comparison of the fuel requirements for power stations continuously producing one gigawatt of power for one year.
Power station - Amount of fuel
coal-fired - 4.4 million tonnes of black coal* [*energy density 24 MJ/kg]
coal-fired - 10.8 million tonnes of brown coal
fission reactor - 1.3 tonnes of uranium-235 (from 35 tonnes of uranium oxide or 210 tonnes of uranium ore)
fusion reactor - 150 kilograms of deuterium (obtained from two Olympic-sized pools of water) and 500 kilograms of lithium