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[[Rio Tinto]], one of the world's largest mining companies, has major interests in uranium mining in Australia and in Namibia. It is the world's second largest producer of uranium. <ref name="Rio Tinto submission"> Rio Tinto, "[http://www.pmc.gov.au/umpner/submissions/197_sub_umpner.pdf Rio Tinto Submission to the Review of Uranium Mining, Processing and Nuclear Energy in Australia]", August 2006. (210kb Pdf)</ref> In 2005, eight mining companies accounted for 78% of world uranium mine production. The three main companies are [[Cameco]] (20%), Rio Tinto (13%), and [[Areva]] (12%). Canada produces 28% and Australia 23%.<ref>Uranium Information Centre, [http://www.uic.com.au/nip41.htm ''World Uranium Mining,''] July 2005.</ref>