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SUPPLEMENTAL CASH FLOW INFORMATION - Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Decrease (increase) in operating assets:    
Trade and other receivables $ (20,164) $ (12,108)
Inventories (80,493) (38,802)
Other operating assets 768 30,736
Increase (decrease) in operating liabilities:    
Accounts payable 9,320 (13,123)
Accrued liabilities (50,787) (13,687)
Reclamation liabilities 0 (94)
Other operating liabilities (28,548) (9,605)
Net change in operating assets and liabilities $ (169,904) $ (56,683)