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Property, plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year $ 4,191,892  
Impairment charges 0 $ 358,330
Property, plant and equipment - End of year 3,881,926 4,191,892
Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 9,140,575 9,176,181
Additions 55,362 143,333
Transfers 0 0
Change in reclamation provision 132,317 17,541
Disposals (14,332) (88,473)
JV Inkai restructuring [1] (367,993)  
Pre-commerical production revenue [2]   (29,305)
Effect of movements in exchange rates 63,532 (78,702)
Property, plant and equipment - End of year 9,009,461 9,140,575
Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 4,948,683 4,520,595
Depreciation charge 235,436 320,154
Transfers 0 0
Change in reclamation provision 59,616 43
Disposals (10,685) (79,951)
JV Inkai restructuring [1] (167,143)  
Impairment charges [3],[4]   239,781
Effect of movements in exchange rates 61,628 (51,939)
Property, plant and equipment - End of year 5,127,535 4,948,683
Land and buildgings [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,327,863  
Property, plant and equipment - End of year 2,254,871 2,327,863
Land and buildgings [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 5,045,112 4,979,489
Additions 1,944 27,343
Transfers 104,760 104,134
Change in reclamation provision 132,317 17,541
Disposals (186) (4,610)
JV Inkai restructuring [1] (245,882)  
Pre-commerical production revenue [2]   (22,818)
Effect of movements in exchange rates 51,843 (55,967)
Property, plant and equipment - End of year 5,089,908 5,045,112
Land and buildgings [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,717,249 2,508,212
Depreciation charge 120,754 137,853
Transfers 13,036 48,209
Change in reclamation provision 59,616 43
Disposals (185) (2,393)
JV Inkai restructuring [1] (123,919)  
Impairment charges [3],[4]   67,535
Effect of movements in exchange rates 48,486 (42,210)
Property, plant and equipment - End of year 2,835,037 2,717,249
Plant and equipment [member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,118,175  
Property, plant and equipment - End of year 957,766 1,118,175
Plant and equipment [member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 2,729,635 2,640,543
Additions 7,274 13,649
Transfers 20,044 106,669
Change in reclamation provision 0 0
Disposals (7,355) (4,803)
JV Inkai restructuring [1] (109,748)  
Pre-commerical production revenue [2]   (6,487)
Effect of movements in exchange rates 15,094 (19,936)
Property, plant and equipment - End of year 2,654,944 2,729,635
Plant and equipment [member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,611,460 1,460,953
Depreciation charge 111,465 175,811
Transfers 6,333 (35,243)
Change in reclamation provision 0 0
Disposals (5,853) (4,130)
JV Inkai restructuring [1] (38,783)  
Impairment charges [3],[4]   25,359
Effect of movements in exchange rates 12,556 (11,290)
Property, plant and equipment - End of year 1,697,178 1,611,460
Furniture and fixtures [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 10,065  
Property, plant and equipment - End of year 5,223 10,065
Furniture and fixtures [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 90,817 95,168
Additions 0 3,521
Transfers 288 (2,455)
Change in reclamation provision 0 0
Disposals (4,714) (4,578)
JV Inkai restructuring [1] (6,624)  
Pre-commerical production revenue [2]   0
Effect of movements in exchange rates 316 (839)
Property, plant and equipment - End of year 80,083 90,817
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 80,752 80,592
Depreciation charge 3,217 6,490
Transfers (322) (2,451)
Change in reclamation provision 0 0
Disposals (4,647) (3,269)
JV Inkai restructuring [1] (4,441)  
Impairment charges [3],[4]   0
Effect of movements in exchange rates 301 (610)
Property, plant and equipment - End of year 74,860 80,752
Under constructions [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 98,899  
Property, plant and equipment - End of year 26,666 98,899
Under constructions [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 154,731 340,340
Additions 45,516 97,729
Transfers (129,436) (208,359)
Change in reclamation provision 0 0
Disposals (1,663) (74,482)
JV Inkai restructuring [1] (5,739)  
Pre-commerical production revenue [2]   0
Effect of movements in exchange rates 56 (497)
Property, plant and equipment - End of year 63,465 154,731
Under constructions [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 55,832 80,674
Depreciation charge 0 0
Transfers (19,047) (10,515)
Change in reclamation provision 0 0
Disposals 0 (70,159)
JV Inkai restructuring [1] 0  
Impairment charges [3],[4]   55,841
Effect of movements in exchange rates 14 (9)
Property, plant and equipment - End of year 36,799 55,832
Exploration and evaluation [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 636,890  
Property, plant and equipment - End of year 637,400 636,890
Exploration and evaluation [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 1,120,280 1,120,641
Additions 628 1,091
Transfers 4,344 11
Change in reclamation provision 0 0
Disposals (414) 0
JV Inkai restructuring [1] 0  
Pre-commerical production revenue [2]   0
Effect of movements in exchange rates (3,777) (1,463)
Property, plant and equipment - End of year 1,121,061 1,120,280
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Property, plant and equipment - Beginning of year 483,390 390,164
Depreciation charge 0 0
Transfers 0 0
Change in reclamation provision 0 0
Disposals 0 0
JV Inkai restructuring [1] 0  
Impairment charges [3],[4]   91,046
Effect of movements in exchange rates 271 2,180
Property, plant and equipment - End of year $ 483,661 $ 483,390
[1]

Effective January 1, 2018, Cameco’s ownership interest in JV Inkai was reduced to 40 % r esulting in JV Inkai being accounted for on an equity basis instead of proportionate consolidation (see note 11 ).

[2]

During 2017, revenues of $ 29,305,000 from the sales of inventories before the commencement of commercial production of JV Inkai Bloc k 3 were recorded as a reduction of the respective mining assets.

[3]

Also in the fourth quarter of 2017, Cameco announced the planned temporary suspension of production at the McArthur River/Key Lake operation. Due to this announcement, the Key Lake calciner project, which is part of the uranium segment and was initially undertaken to allow for an increase in annual production, was re-evaluated. As a result, the Company wrote off $ 55,333,000 of assets under construction on this project.

[4]

In the fourth quarter of 2017, all remaining proven and probable reserves of our US operations were reclassified to resources, indicating that the mineable remaining pounds of U 3 O 8 no l onger had demonstrated economic viability, but had reasonable prospects for economic extraction. In accordance with the provisions of IAS 36, Impairment of Assets , Cameco considered this to be an indicator that the assets of the two cash generating units i n the US could potentially be impaired and accordingly, we were required to estimate the recoverable amount of these assets.

An impairment charge of $ 184,448,000 ($ 144,450,000 (USD)) was recognized as part of the uranium segment. The amount of the charge w as determined as the excess of the carrying value over the recoverable amount which was based on a fair value less costs to sell model and categorized as a non-recurring level 3 fair value measurement. The recoverable amount was determined to be $ 133,228,0 00 ($ 106,200,000 (USD)) based on the fair value of resources in place using comparable market metrics.