ASSET RETIREMENT AND ENVIRONMENTAL RECLAMATION OBLIGATIONS - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset Retirement Obligation and Accrual for Environmental Loss Contingencies [Roll Forward]
Obligations at beginning of period	$ 187,007	$ 90,281
Liabilities incurred	0	0
Liabilities settled	(5,711)	(3,184)
Accretion expense	5,298	6,163
Change in estimate	30,607	93,747
Total obligations at end of period	217,201	187,007
Less current obligations at end of period	(21,635)	(5,419)
Long-term obligations at end of period	$ 195,566	$ 181,588