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Joint operations | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Joint Operations [Abstract] |
Joint operations | 30. Joint operations Cameco conducts a portion of its exploration, development, mining and milling activities through joint operations located around the world. Operations are governed by agreements that provide for joint control of the strategic operating, investing and financing activities among the partners. These agreements were considered in the determination of joint control. Cameco’s significant Canadian uranium joint operation interests are McArthur River, Key Lake and Cigar Lake. The Canad ian uranium joint operations allocate uranium production to each joint operation participant and the joint operation participant derives revenue directly from the sale of such product. Mining and milling expenses incurred by joint operations are included i n the cost of inventory. As a result of the restructuring of JV Inkai, effective January 1, 2018 Cameco’s ownership interest was reduced to 40% (previously 60%) and Cameco began accounting for JV Inkai on an equity basis. In 2017, the participants in the I nkai joint operation purchased uranium from JV Inkai and, in turn, derived revenue directly from the sale of such product to third party customers.
Cameco reflects its proportionate interest in these assets and liabilities as follows:
| Principal place |  |  |  |  |
| of business | Ownership |  | 2018 |  | 2017
Total assets |  |  |  |  |  |
McArthur River | Canada | 69.81% | $ | 1,065,562 | $ | 1,121,509
Key Lake | Canada | 83.33% |  | 537,233 |  | 482,879
Cigar Lake | Canada | 50.03% |  | 1,503,863 |  | 1,531,150
Inkai | Kazakhstan | 40.00% |  | - |  | 230,280
|  |  | $ | 3,106,658 | $ | 3,365,818
Total liabilities |  |  |  |  |  |
McArthur River |  | 69.81% | $ | 32,829 | $ | 38,896
Key Lake |  | 83.33% |  | 222,369 |  | 140,214
Cigar Lake |  | 50.03% |  | 38,478 |  | 40,687
Inkai |  | 40.00% |  | - |  | 119,998
|  |  | $ | 293,676 | $ | 339,795
Through unsecured shareholder loans, Cameco has agreed to fund the development of the Inkai project. While proportionately consolidating JV Inkai, in 2017 Cameco eliminated the loan balances recorded by Inkai and recor ded advances receivable (notes 10 and 31) represe nting its 40% share.

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- Definition The disclosure of joint operations. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B4 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B4_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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