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INVENTORIES: | 3 Months Ended
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Mar. 31, 2020
INVENTORIES: |
INVENTORIES: | NOTE 4 — INVENTORIES: ​ Inventories were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At March 31, | ​ | At December 31, | ​
(in millions) |  | 2020 |  | 2019 | ​
Inventory, current: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Metals at average cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finished goods | ​ | $ | 82.1 | ​ | $ | 87.2 | ​
Work-in-process | ​ |  | 263.8 | ​ |  | 259.7 | ​
Ore stockpiles on leach pads | ​ | ​ | 385.1 | ​ | ​ | 358.4 | ​
Supplies at average cost | ​ |  | 348.4 | ​ |  | 363.2 | ​
Total current inventory | ​ | $ | 1,079.4 | ​ | $ | 1,068.5 | ​
Inventory, long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ore stockpiles on leach pads | ​ | $ | 1,149.0 | ​ | $ | 1,230.3 | ​
​ During the three months ended March 31, 2020 and 2019, total leaching costs capitalized as non-current inventory of ore stockpiles on leach pads amounted to $50.7 million and $122.3 million, respectively. Leaching inventories recognized in cost of sales amounted to $105.9 million and $94.1 million for the three months March 31, 2020 and 2019, 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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