Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating activities
Net income (loss)	$ 134,808	$ (355,698)
Adjustments for:
Depreciation, depletion, and amortization	56,850	61,409
Reclamation and remediation costs	74,170	277,732
Payments for reclamation and remediation liabilities	(12,684)	(77,873)
Deferred income taxes	(19,902)	(26,511)
Stock-based compensation	17,062	(2,974)
Change in fair value of marketable securities	(3,721)	(6,419)
Loss (gain) on sale and disposal of assets, net	755	(5,599)
Impairment charges of long-lived and other assets	0	114,230
Loss (gain) on foreign exchange	15,290	6,499
Non-cash care and maintenance	30,930	20,003
Other operating activities	7,412	4,163
Net change in operating assets and liabilities	(58,324)	(62,463)
Net cash provided by (used in) operating activities	242,646	(53,501)
Investing activities
Additions to mineral properties, plant and equipment	(104,962)	(72,211)
Acquisitions, net	(108,736)	0
Purchases of marketable securities	(51,681)	(9,626)
Net proceeds from sale of marketable securities	41,971	8,747
Proceeds from sale of mineral properties, plant and equipment	0	4,853
Other investing activities	655	(225)
Net cash used in investing activities	(222,753)	(68,462)
Financing activities
Repayment of debt, principal	0	(920)
Proceeds from the issuance of debt, related party	12,900	3,415
Repurchase of common shares	0	(9,825)
Principal payments on finance leases	(2,369)	(2,002)
Net cash provided by (used in) financing activities	10,531	(9,332)
Effect of foreign exchange rate changes on cash and cash equivalents	(6,202)	(2,791)
Net increase (decrease) in cash, cash equivalents, and restricted cash	24,222	(134,086)
Cash, cash equivalents, and restricted cash beginning of period	387,882	492,494
Cash, cash equivalents, and restricted cash end of period	$ 412,104	$ 358,408