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INVENTORIES: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Metals at average cost: |  |  |
Finished goods | $ 78.5 | $ 58.6 |
Work-in-process | 330.5 | 340.7 |
Ore stockpiles on leach pads | 259.7 | 259.7 |
Supplies at average cost | 345.2 | 313.9 |
Total current inventory | 1,013.9 | 972.9 |
Inventory, long-term: |  |  |
Ore stockpiles on leach pads | 1,064.3 | 1,097.6 |
Total leaching costs added as long-term inventory of ore stockpiles in leach pads | 264.3 | 247.4 | $ 194.0
Long-term leaching inventories recognized as cost of sales | $ 297.5 | $ 313.7 | $ 359.1

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