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INVENTORIES: (Tables) | 3 Months Ended
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Mar. 31, 2024
INVENTORIES: |
Schedule of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At March 31, | ​ | At December 31, | ​
(in millions) |  | 2024 |  | 2023 | ​
Inventory, current: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Metals at average cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finished goods | ​ | $ | 85.7 | ​ | $ | 68.8 | ​
Work-in-process | ​ |  | 286.9 | ​ |  | 313.0 | ​
Ore stockpiles on leach pads | ​ | ​ | 232.6 | ​ | ​ | 230.9 | ​
Supplies at average cost | ​ |  | 409.2 | ​ |  | 404.2 | ​
Total current inventory | ​ | $ | 1,014.4 | ​ | $ | 1,016.9 | ​
Inventory, long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ore stockpiles on leach pads | ​ | $ | 1,132.5 | ​ | $ | 1,121.7 | ​

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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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Balance Type: | na
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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration