Uranium is a very unusual sector. For one, it's small. So small, that at one point in history top-producing nations like Canada and France tried to form a uranium cartel to control prices for the metal.
The "uranium OPEC" failed. But production today is de facto controlled by a handful of companies.
Consider this. The world's top ten uranium mines account for 59% of global production. (The top mine, Saskatchewan's McArthur River, alone puts out 15% of the world's supply.) Full article at: Uranium Market
