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INVENTORIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of inventory [Line Items] |  |
Stockpiled ore | $ 157,141 | $ 16,559
Leach pad inventory | 284,355 | 171,768
Work-in-process | 4,368 | 1,596
Finished goods | 38,661 | 14,141
Materials and supplies | 87,466 | 35,354
Inventories | 571,991 | 239,418
Stockpiled ore - non-current | (132,912) | 0
Materials and supplies - non-current | (1,700) | (1,848)
Current inventories | 437,379 | 237,570
Inventory write-down | 7,200 | 3,300
Inventory write-down, ore stockpiles | 8,600 | $ 3,600
Copler |  |
Disclosure of inventory [Line Items] |  |
Current ore stockpiled sulfide | 12,500 |
Non-current ore stockpiled sulfide | $ 132,900 |

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