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SUPPLEMENTAL CASH FLOW INFORMATION - Changes ins Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash Flow Statement [Abstract]    
Trade and other receivables $ 16,509 $ (58,525)
Other current assets (10,649) (7,819)
Inventories 79,103 (10,872)
Accounts payable and accrued liabilities (17,072) 15,801
Reclamation and closure cost provision - current (4,832) (3,493)
Net change in operating asses and liabilities $ 63,059 $ (64,908) [1]
[1] See note 2(r)