It hasn't been used much here (we do have one nuclear reactor, and a replacement for it is under construction) partly because we also have a lot of coal, and with the anti-nuclear paranoia of the past, it's been easier to have (rather dirty) coal power plants.
Australia is the #2 producer or UOx (Uranium Oxide), Canada is #1.
http://www.world-nuclear.org/info/inf23.htm
"Canada produces the largest share of uranium from mines (29% of world supply from mines), followed by Australia (21%)."
Canada 2006
http://www.world-nuclear.org/info/inf49.htm
Australia 2005
http://www.world-nuclear.org/info/inf64.htm
Plenty of DU ammo started out as ore from Canada & Australia.