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Cameco Corp. says it is “disappointed” that the Canada Revenue Agency chose to appeal a month-old decision that found the company does not have to pay back taxes on $483 million in revenue earned in 2003, 2005 and 2006.

“We hope to have a reasoned discussion with the CRA to see if we can reach a resolution for all years based on the principles laid out in the ruling,” Tim Gitzel, the company’s CEO, said in a statement.

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The federal government agency’s appeal is the latest development in its long-running dispute with the Saskatoon-based uranium miner over billions of dollars earned by its European subsidiary over the last 15 years.

In a 293-page decision handed down last month, Tax Court of Canada Justice John Owen ruled that the company was within its rights to use Cameco Europe Limited to report uranium sales earnings in low-tax Switzerland.

Cameco called Owen’s decision a “vindication” of its view that the practice was legal and sound, and suggested it should be applied to the other tax years in question. CRA has issued reassessments for 2003 to 2012, with more expected.