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SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Investing and Financing Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash Flow Statement [Abstract]    
Consideration issued for acquisition of Alacer $ (2,179,647) $ 0
Acquisition of net assets in exchange for a receivable 12,576 0
Reclamation and closure cost provision assumed in land acquisition 0 (12,990)
Transfer of share-based payment reserve upon exercise of stock options (2,976) (2,804)
Transfer of equity-settled PSUs 0 1,356
Transfer of cash-settled RSUs and PSUs (4,138) 0
Extinguishment of loan receivable in connection with the acquisition of non-controlling interest 0 11,369
Non-cash consideration for acquisition of non-controlling interest 0 (30,101)
Other non-cash investing and financing transactions 2,643 0
Non-cash investing and financing transactions $ (2,171,542) $ (33,170)