Located in the Canadian Shield of northern Saskatchewan and Alberta, Canada, the Athabasca Basin is the world’s leading source of high grade uranium and currently supplies approximately 20 percent of all that used across the planet. Covering some 100,000 square kilometres of Saskatchewan, and a small portion of Alberta, the surface of the basin consists of sandstone sediment varying from 100 to 1,000 metres in depth. It is at the base of this sandstone that uranium ore has been mostly found since it was first discovered in the region in the 1940s.