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Joint operations | 12 Months Ended
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Dec. 31, 2020
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 |  | 2020 |  | 2019
Total assets |  |  |  |  |  |
McArthur River | Canada | 69.81% | $ | 1,027,617 | $ | 1,046,556
Key Lake | Canada | 83.33% |  | 560,845 |  | 524,324
Cigar Lake | Canada | 50.03% |  | 1,327,956 |  | 1,354,399
|  |  | $ | 2,916,418 | $ | 2,925,279
Total liabilities |  |  |  |  |  |
McArthur River |  | 69.81% | $ | 34,597 | $ | 32,132
Key Lake |  | 83.33% |  | 278,331 |  | 227,562
Cigar Lake |  | 50.03% |  | 46,604 |  | 47,396
|  |  | $ | 359,532 | $ | 307,090

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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 2020-01-01 -Paragraph B4 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B4_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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