11. Intangible assets

	Intellectual Property	Patents		Total
Cost
Beginning of year	$118,819		$8,890	$127,709
Effect of movements in exchange rates	—		(193)	(193)
End of year	118,819		8,697	127,516
Accumulated depreciation
Beginning of year	28,509		246	28,755
Amortization charge	3,959		484	4,443
Effect of movements in exchange rates	—		(9)	(9)
End of year	32,468		721	33,189
Net book value at December 31, 2012	$86,351		$7,976	$94,327
	Intellectual Property	Patents		Total
Cost
Beginning of year	$118,819	$	—	$118,819
Additions	—		8,462	8,462
Effect of movements in exchange rates	—		428	428
End of year	118,819		8,890	127,709
Accumulated depreciation
Beginning of year	24,549		—	24,549
Amortization charge	3,960		239	4,199
Effect of movements in exchange rates	—		7	7
End of year	28,509		246	28,755
Net book value at December 31, 2011	$90,310		$8,644	$98,954

The intangible asset values relate to intellectual property acquired with Cameco Fuel Manufacturing (CFM) and patents acquired with UFP Investments LLC (UFP). The CFM intellectual property is being amortized on a unit-of-production basis over its remaining life which expires in 2030. Amortization is allocated to the cost of inventory and is recognized in cost of products and services sold as inventory is sold. The patents acquired with UFP are being amortized to cost of products and services sold on a straight-line basis over their remaining life which expires in July 2029.