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RECLAMATION PROVISION (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset retirement obligation |
Asset retirement obligation and environmental remediation liability |
Schedule of environmental remediation liability and reclamation provisions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As at |  | As at
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Asset retirement obligations - non-current, beginning of year | ​ | $ | 706,958 | ​ | $ | 635,648
Asset retirement obligations - current, beginning of year | ​ |  | 4,547 | ​ |  | 11,320
Current year additions and changes in estimate, net(i) | ​ |  | 217,506 | ​ |  | 72,181
Current year accretion | ​ |  | 15,951 | ​ |  | 6,554
Liabilities settled | ​ |  | (16,850) | ​ |  | (3,213)
Foreign exchange revaluation | ​ |  | (40,666) | ​ |  | (10,985)
Reclassification from non-current to current, end of year | ​ |  | (22,127) | ​ |  | (4,547)
Asset retirement obligations - non-current, end of year | ​ | $ | 865,319 | ​ | $ | 706,958
Note:
| (i) | Current year additions include $180.4 million related to the acquisition of Kirkland.
Environmental remediation liability |
Asset retirement obligation and environmental remediation liability |
Schedule of environmental remediation liability and reclamation provisions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As at |  | As at
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Environmental remediation liability - non-current, beginning of year | ​ | $ | 15,491 | ​ | $ | 16,135
Environmental remediation liability - current, beginning of year | ​ |  | 3,000 | ​ |  | 3,950
Current year additions and changes in estimate, net | ​ |  | — | ​ |  | 1,048
Liabilities settled | ​ |  | (3,058) | ​ |  | (2,816)
Foreign exchange revaluation | ​ |  | (1,043) | ​ |  | 174
Reclassification from non-current to current, end of year | ​ |  | (1,381) | ​ |  | (3,000)
Environmental remediation liability - non-current, end of year | ​ | $ | 13,009 | ​ | $ | 15,491

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