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SUPPLEMENTAL CASH FLOW INFORMATION - Operating Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Decrease (increase) in operating assets: |  |
Trade and other receivables | $ (9,532) | $ (5,515)
Inventories | (56,371) | (56,843)
Other operating assets | (911) | 7,193
Increase (decrease) in operating liabilities: |  |
Accounts payable | (22,700) | 7,101
Accrued liabilities | (17,488) | (66,056)
Reclamation liabilities | (791) | 62
Other operating liabilities | (4,031) | (27,286)
Net change in operating assets and liabilities | $ (111,824) | $ (141,344)

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