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LEASES - Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]    
Finance lease right-of-use assets, net (included in Mineral properties, plant and equipment, net) $ 101,705 $ 114,882
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Mineral properties, plant and equipment, net Mineral properties, plant and equipment, net
Operating lease right-of-use assets (included in Other non-current assets) $ 17,946 $ 7,530
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other non-current assets Other non-current assets
Total lease right-of-use-assets $ 119,651 $ 122,412
Short-term finance lease liabilities (included in Finance lease liabilities) 3,872 12,439
Short-term operating lease liabilities (included in Accrued liabilities and other) $ 1,976 $ 2,238
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued liabilities and other Accrued liabilities and other
Long-term finance lease liabilities (included in Finance Lease liabilities) $ 102,434 $ 105,965
Long-term operating lease liabilities (included in Other non-current liabilities) $ 16,969 $ 5,525
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other non-current liabilities Other non-current liabilities
Total lease liabilities $ 125,251 $ 126,167