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INVENTORIES: (Tables) | 12 Months Ended
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Dec. 31, 2022
INVENTORIES: |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) | ​ | 2022 |  | 2021
Inventory, current: | ​ | ​ | ​ | ​ | ​ | ​
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
​

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process current and noncurrent. + References No definition available. + Details
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- References No definition available. + Details
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