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INVENTORIES: (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Metals at average cost: |  |  |
Finished goods | $ 50.8 | $ 87.2 |
Work-in-process | 248.9 | 259.7 |
Ore stockpiles on leach pads | 298.5 | 358.4 |
Supplies at average cost | 352.0 | 363.2 |
Total current inventory | 950.2 | 1,068.5 |
Inventory, long-term: |  |  |
Ore stockpiles on leach pads | 1,125.0 | 1,230.3 |
Total leaching costs added as long-term inventory of ore stockpiles in leach pads | 194.0 | 469.0 | $ 506.6
Long-term leaching inventories recognized as cost of sales | $ 359.1 | $ 385.8 | $ 299.4

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