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SUPPLEMENTAL CASH FLOW INFORMATION - Operating Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Decrease (increase) in operating assets:
Trade and other receivables	$ (10,394)	$ (14,322)
Inventories	(32,516)	(14,062)
Other operating assets	(5,734)	10,651
Increase (decrease) in operating liabilities:
Accounts payable	21,092	(2,519)
Accrued liabilities	(44,385)	(16,219)
Reclamation liabilities	118	(58)
Other operating liabilities	3,239	(9,172)
Net change in operating assets and liabilities	$ (68,580)	$ (45,701)

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Increase (Decrease) in Asset Retirement Obligations, Noncurrent

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The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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