seventeen countries produced concentrated uranium oxides, with Canada (27.9% of world production) and Australia(22.8%) being the largest producers and Kazakhstan (10.5%), Russia (8.0%), Namibia (7.5%), Niger (7.4%), Uzbekistan (5.5%), the United States (2.5%), Ukraine (1.9%) and China (1.7%) also producing significant amounts. [39] The ultimate supply of uranium is believed to