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Joint operations | 12 Months Ended
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Dec. 31, 2019
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.
Cameco reflects its proportionate interest in these assets and liabilities as follows:
| Principal place |  |  |  |  |
| of business | Ownership |  | 2019 |  | 2018
Total assets |  |  |  |  |  |
McArthur River | Canada | 69.81% | $ | 1,046,556 | $ | 1,065,562
Key Lake | Canada | 83.33% |  | 524,324 |  | 537,233
Cigar Lake | Canada | 50.03% |  | 1,354,399 |  | 1,503,863
|  |  | $ | 2,925,279 | $ | 3,106,658
Total liabilities |  |  |  |  |  |
McArthur River |  | 69.81% | $ | 32,132 | $ | 32,829
Key Lake |  | 83.33% |  | 227,562 |  | 222,369
Cigar Lake |  | 50.03% |  | 47,396 |  | 38,478
|  |  | $ | 307,090 | $ | 293,676

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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 2019-01-01 -Paragraph B4 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B4_c&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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