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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property Plant And Equipment [Abstract] |
Schedule of Property plant and equipment table |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Land |  | Plant |  | Furniture |  |  |  |  | Exploration |  |  |
| and |  | and |  | and |  | Under |  | and |  |  |
| buildings |  | equipment |  | fixtures |  | construction |  | evaluation |  | Total
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year | $ | 5,045,112 |  | $ | 2,729,635 |  | $ | 90,817 |  | $ | 154,731 |  | $ | 1,120,280 |  | $ | 9,140,575
Additions |  | 1,944 |  |  | 7,274 |  |  | - |  |  | 45,516 |  |  | 628 |  |  | 55,362
Transfers |  | 104,760 |  |  | 20,044 |  |  | 288 |  |  | (129,436) |  |  | 4,344 |  |  | -
Change in reclamation provision [note 15] |  | 132,317 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 132,317
Disposals |  | (186) |  |  | (7,355) |  |  | (4,714) |  |  | (1,663) |  |  | (414) |  |  | (14,332)
JV Inkai restructuring(a) |  | (245,882) |  |  | (109,748) |  |  | (6,624) |  |  | (5,739) |  |  | - |  |  | (367,993)
Effect of movements in exchange rates |  | 51,843 |  |  | 15,094 |  |  | 316 |  |  | 56 |  |  | (3,777) |  |  | 63,532
End of year |  | 5,089,908 |  |  | 2,654,944 |  |  | 80,083 |  |  | 63,465 |  |  | 1,121,061 |  |  | 9,009,461
Accumulated depreciation and impairment
Beginning of year |  | 2,717,249 |  |  | 1,611,460 |  |  | 80,752 |  |  | 55,832 |  |  | 483,390 |  |  | 4,948,683
Depreciation charge |  | 120,754 |  |  | 111,465 |  |  | 3,217 |  |  | - |  |  | - |  |  | 235,436
Transfers |  | 13,036 |  |  | 6,333 |  |  | (322) |  |  | (19,047) |  |  | - |  |  | -
Change in reclamation provision [note 15] |  | 59,616 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 59,616
Disposals |  | (185) |  |  | (5,853) |  |  | (4,647) |  |  | - |  |  | - |  |  | (10,685)
JV Inkai restructuring(a) |  | (123,919) |  |  | (38,783) |  |  | (4,441) |  |  | - |  |  | - |  |  | (167,143)
Effect of movements in exchange rates |  | 48,486 |  |  | 12,556 |  |  | 301 |  |  | 14 |  |  | 271 |  |  | 61,628
End of year |  | 2,835,037 |  |  | 1,697,178 |  |  | 74,860 |  |  | 36,799 |  |  | 483,661 |  |  | 5,127,535
Net book value at December 31, 2018 | $ | 2,254,871 |  | $ | 957,766 |  | $ | 5,223 |  | $ | 26,666 |  | $ | 637,400 |  | $ | 3,881,926
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Land |  | Plant |  | Furniture |  |  |  |  | Exploration |  |  |
| and |  | and |  | and |  | Under |  | and |  |  |
| buildings |  | equipment |  | fixtures |  | construction |  | evaluation |  | Total
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year | $ | 4,979,489 |  | $ | 2,640,543 |  | $ | 95,168 |  | $ | 340,340 |  | $ | 1,120,641 |  | $ | 9,176,181
Additions |  | 27,343 |  |  | 13,649 |  |  | 3,521 |  |  | 97,729 |  |  | 1,091 |  |  | 143,333
Transfers |  | 104,134 |  |  | 106,669 |  |  | (2,455) |  |  | (208,359) |  |  | 11 |  |  | -
Change in reclamation provision |  | 17,541 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 17,541
Disposals |  | (4,610) |  |  | (4,803) |  |  | (4,578) |  |  | (74,482) |  |  | - |  |  | (88,473)
Pre-commercial production revenue(b) |  | (22,818) |  |  | (6,487) |  |  | - |  |  | - |  |  | - |  |  | (29,305)
Effect of movements in exchange rates |  | (55,967) |  |  | (19,936) |  |  | (839) |  |  | (497) |  |  | (1,463) |  |  | (78,702)
End of year |  | 5,045,112 |  |  | 2,729,635 |  |  | 90,817 |  |  | 154,731 |  |  | 1,120,280 |  |  | 9,140,575
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning of year |  | 2,508,212 |  |  | 1,460,953 |  |  | 80,592 |  |  | 80,674 |  |  | 390,164 |  |  | 4,520,595
Depreciation charge |  | 137,853 |  |  | 175,811 |  |  | 6,490 |  |  | - |  |  | - |  |  | 320,154
Transfers |  | 48,209 |  |  | (35,243) |  |  | (2,451) |  |  | (10,515) |  |  | - |  |  | -
Change in reclamation provision |  | 43 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 43
Disposals |  | (2,393) |  |  | (4,130) |  |  | (3,269) |  |  | (70,159) |  |  | - |  |  | (79,951)
Impairment charge(c)(d) |  | 67,535 |  |  | 25,359 |  |  | - |  |  | 55,841 |  |  | 91,046 |  |  | 239,781
Effect of movements in exchange rates |  | (42,210) |  |  | (11,290) |  |  | (610) |  |  | (9) |  |  | 2,180 |  |  | (51,939)
End of year |  | 2,717,249 |  |  | 1,611,460 |  |  | 80,752 |  |  | 55,832 |  |  | 483,390 |  |  | 4,948,683
Net book value at December 31, 2017 | $ | 2,327,863 |  | $ | 1,118,175 |  | $ | 10,065 |  | $ | 98,899 |  | $ | 636,890 |  | $ | 4,191,892
(a) 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). (b) 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. (c) 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 U3O8 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. (d) 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.

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