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INVENTORIES: | 12 Months Ended
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Dec. 31, 2020
INVENTORIES: |
INVENTORIES: | NOTE 4—INVENTORIES: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31,
(in millions) | ​ | 2020 |  | 2019
Inventory, current: | ​ | ​ | ​ | ​ | ​ | ​
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 amounted to $194.0 million, $469.0 million and $506.6 million in 2020, 2019 and 2018, respectively. Long-term leaching inventories recognized as cost of sales amounted to $359.1 million, $385.8 million and $299.4 million in 2020, 2019 and 2018, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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