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v3.20.1

Property, plant and equipment (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | $ 3,881,926 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 10,136 |
Disposals |  | (9) |
Depreciation charge |  | (1,978) |
Right-of-use assets - end of year |  | 8,149 | $ 0
Property, plant and equipment - End of year |  | 3,720,672 | 3,881,926
Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 9,009,461 | 9,140,575
Additions |  | 75,211 | 55,362
Transfers |  | 0 | 0
Change in reclamation provision |  | 24,883 | 132,317
Disposals |  | (5,751) | (14,332)
JV Inkai restructuring | [1] |  | (367,993)
Effect of movements in exchange rates |  | (90,358) | 63,532
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 9,013,446 | 9,009,461
Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 5,127,535 | 4,948,683
Depreciation charge |  | 236,336 | 235,436
Transfers |  |  | 0
Change in reclamation provision |  | 2,732 | 59,616
Disposals |  | (3,197) | (10,685)
JV Inkai restructuring | [1] |  | (167,143)
Effect of movements in exchange rates |  | (62,483) | 61,628
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 5,300,923 | 5,127,535
Land and buildgings [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,254,871 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 3,517 |
Disposals |  | 0 |
Depreciation charge |  | (871) |
Right-of-use assets - end of year |  | 2,646 | 0
Property, plant and equipment - End of year |  | 2,167,268 | 2,254,871
Land and buildgings [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 5,089,908 | 5,045,112
Additions |  | 2,327 | 1,944
Transfers |  | 17,157 | 104,760
Change in reclamation provision |  | 24,883 | 132,317
Disposals |  | (923) | (186)
JV Inkai restructuring | [1] |  | (245,882)
Effect of movements in exchange rates |  | (32,642) | 51,843
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 5,100,710 | 5,089,908
Land and buildgings [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,835,037 | 2,717,249
Depreciation charge |  | 128,579 | 120,754
Transfers |  |  | 13,036
Change in reclamation provision |  | 2,732 | 59,616
Disposals |  | (225) | (185)
JV Inkai restructuring | [1] |  | (123,919)
Effect of movements in exchange rates |  | (30,035) | 48,486
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 2,936,088 | 2,835,037
Plant and equipment [member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 957,766 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 5,768 |
Disposals |  | (9) |
Depreciation charge |  | (675) |
Right-of-use assets - end of year |  | 5,084 | 0
Property, plant and equipment - End of year |  | 890,200 | 957,766
Plant and equipment [member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 2,654,944 | 2,729,635
Additions |  | 7,179 | 7,274
Transfers |  | 28,453 | 20,044
Change in reclamation provision |  | 0 | 0
Disposals |  | (3,486) | (7,355)
JV Inkai restructuring | [1] |  | (109,748)
Effect of movements in exchange rates |  | (8,925) | 15,094
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 2,678,165 | 2,654,944
Plant and equipment [member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 1,697,178 | 1,611,460
Depreciation charge |  | 105,700 | 111,465
Transfers |  |  | 6,333
Change in reclamation provision |  | 0 | 0
Disposals |  | (2,194) | (5,853)
JV Inkai restructuring | [1] |  | (38,783)
Effect of movements in exchange rates |  | (7,635) | 12,556
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 1,793,049 | 1,697,178
Furniture and fixtures [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 5,223 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 851 |
Disposals |  | 0 |
Depreciation charge |  | (432) |
Right-of-use assets - end of year |  | 419 | 0
Property, plant and equipment - End of year |  | 4,687 | 5,223
Furniture and fixtures [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 80,083 | 90,817
Additions |  | 158 | 0
Transfers |  | 951 | 288
Change in reclamation provision |  | 0 | 0
Disposals |  | (142) | (4,714)
JV Inkai restructuring | [1] |  | (6,624)
Effect of movements in exchange rates |  | (181) | 316
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 80,869 | 80,083
Furniture and fixtures [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 74,860 | 80,752
Depreciation charge |  | 2,057 | 3,217
Transfers |  |  | (322)
Change in reclamation provision |  | 0 | 0
Disposals |  | (139) | (4,647)
JV Inkai restructuring | [1] |  | (4,441)
Effect of movements in exchange rates |  | (177) | 301
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 76,601 | 74,860
Under constructions [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 26,666 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 0 |
Disposals |  | 0 |
Depreciation charge |  | 0 |
Right-of-use assets - end of year |  | 0 | 0
Property, plant and equipment - End of year |  | 45,063 | 26,666
Under constructions [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 63,465 | 154,731
Additions |  | 65,482 | 45,516
Transfers |  | (46,561) | (129,436)
Change in reclamation provision |  | 0 | 0
Disposals |  | (507) | (1,663)
JV Inkai restructuring | [1] |  | (5,739)
Effect of movements in exchange rates |  | (17) | 56
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 81,862 | 63,465
Under constructions [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 36,799 | 55,832
Depreciation charge |  | 0 | 0
Transfers |  |  | (19,047)
Change in reclamation provision |  | 0 | 0
Disposals |  | 0 | 0
JV Inkai restructuring | [1] |  | 0
Effect of movements in exchange rates |  | 0 | 14
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 36,799 | 36,799
Exploration and evaluation [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 637,400 |
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Right-of-use assets - beginning of year |  | 0 |
Additions |  | 0 |
Disposals |  | 0 |
Depreciation charge |  | 0 |
Right-of-use assets - end of year |  | 0 | 0
Property, plant and equipment - End of year |  | 613,454 | 637,400
Exploration and evaluation [Member] | Cost [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 1,121,061 | 1,120,280
Additions |  | 65 | 628
Transfers |  | 0 | 4,344
Change in reclamation provision |  | 0 | 0
Disposals |  | (693) | (414)
JV Inkai restructuring | [1] |  | 0
Effect of movements in exchange rates |  | (48,593) | (3,777)
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | 1,071,840 | 1,121,061
Exploration and evaluation [Member] | Accumulated depreciation and impairment [Member] |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |
Property, plant and equipment - Beginning of year |  | 483,661 | 483,390
Depreciation charge |  | 0 | 0
Transfers |  |  | 0
Change in reclamation provision |  | 0 | 0
Disposals |  | (639) | 0
JV Inkai restructuring | [1] |  | 0
Effect of movements in exchange rates |  | (24,636) | 271
Disclosure of quantitative information about right of use assets [Abstract] |  |  |
Property, plant and equipment - End of year |  | $ 458,386 | $ 483,661
[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 ).

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