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COMMITMENTS AND CONTINGENCIES - Lease Obligations and Purchase Commitments (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Mining and surface rights  
2022 $ 492
2023 488
2024 470
2025 443
Total 1,893
Exploration  
2022 8,116
2023 15,080
Total 23,196
Reclamation costs  
2022 6,358
2023 5,873
2024 525
2025 1,186
Thereafter 29,215
Total 43,157
Long-term debt  
2022 4,875
2023 14,712
2024 32,710
2025 10,027
Total 62,324
Lease obligations  
2022 2,949
2023 1,058
2024 441
Total 4,448
Total  
2022 22,791
2023 37,210
2024 34,146
2025 11,656
Thereafter 29,215
Total $ 135,018