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COMMITMENTS AND CONTINGENCIES - Lease Obligations and Purchase Commitments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Mining and surface rights
2021	$ 2,233
2022	492
2023	488
2024	470
Thereafter	443
Total	4,126
Reclamation costs
2021	2,819
2022	5,363
2023	5,510
2024	564
Thereafter	27,428
Total	41,684
Long-term debt
2021	4,875
2022	14,712
2023	42,139
Total	61,726
Lease obligations
2021	2,695
2022	2,416
2023	508
2024	180
Total	5,799
Total
2021	12,622
2022	22,983
2023	48,645
2024	1,214
Thereafter	27,871
Total	$ 113,335

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