Yes, Canada is the largest exporter of uranium ore, with the largest mines located in Athabasca Basin in northern Saskatchewan.

The worldwide production of uranium in 2008 amounted to 43,853 tonnes, of which 20% was mined in Canada. Canada, Kazakhstan, and Australia are the top three producers and together account for 59% of world uranium production. Other important uranium producing countries in excess of 1000 tonnes per year are Namibia, Russia, Niger, Uzbekistan, and the United States.
Source(s):
http://en.wikipedia.org/wiki/Uranium_mining#Canada

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