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SUPPLEMENTAL CASH FLOW INFORMATION - Operating Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Decrease (increase) in operating assets:
Trade and other receivables	$ (38,138)	$ 5,132	$ (44,465)
Inventories	(20,848)	(21,660)	(11,368)
Other operating assets	(1,516)	17,781	1,375
Increase (decrease) in operating liabilities:
Accounts payable	(6,882)	7,761	16,732
Accrued liabilities	38,761	(1,574)	(401)
Reclamation liabilities	(243)	(2,447)	(3,568)
Other operating liabilities	(429)	(45,585)	(24,474)
Net change in operating assets and liabilities	$ (29,295)	$ (40,592)	$ (66,169)

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