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INVENTORIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Inventory [Line Items] |  |  |
Work-in-process | $ 4,951 | $ 4,368 |
Finished goods | 33,877 | 38,525 |
Total current inventories | 389,416 | 437,034 |
Non-current inventories | 221,617 | 135,200 |
Inventory reserves for obsolete materials and supplies inventory | 8,100 | 7,200 |
Inventory write-down | 0 | 12,100 | $ 11,800
Materials and supplies |  |  |
Inventory [Line Items] |  |  |
Raw materials | 79,372 | 85,766 |
Non-current inventories | 1,293 | 1,700 |
Stockpiled ore |  |  |
Inventory [Line Items] |  |  |
Raw materials | 27,589 | 25,582 |
Non-current inventories | 220,324 | 133,500 |
Leach pad inventory |  |  |
Inventory [Line Items] |  |  |
Raw materials | $ 243,627 | $ 282,793 |

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