Explanation:

 1.  China is a leading tin-producing country of the world.  China produces 45 per cent of the world's output of tin.

  2.  India holds world's largest reserve of Thorium.

 3.  Canada was the world's largest uranium producer for many years, accounting for 22% of world output at the time, but in 2009 was overtaken by Kazakhstan.

 4.   Chile is largest producer of Copper in the world.