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INVENTORIES: | 6 Months Ended
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Jun. 30, 2019
INVENTORIES: | NOTE 3 — INVENTORIES: ​ Inventories were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At June 30, | ​ | At December 31, | ​
(in millions) |  | 2019 |  | 2018 | ​
Inventory, current: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Metals at average cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finished goods | ​ | $ | 66.3 | ​ | $ | 69.6 | ​
Work-in-process | ​ |  | 271.4 | ​ |  | 256.8 | ​
Ore stockpiles on leach pads | ​ | ​ | 354.8 | ​ | ​ | 328.0 | ​
Supplies at average cost | ​ |  | 376.1 | ​ |  | 378.3 | ​
Total current inventory | ​ | $ | 1,068.6 | ​ | $ | 1,032.7 | ​
Inventory, long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ore stockpiles on leach pads | ​ | $ | 1,205.8 | ​ | $ | 1,177.4 | ​
​ During the six months ended June 30, 2019 and 2018, total leaching costs capitalized as non-current inventory of ore stockpiles on leach pads amounted to $244.6 million and $256.8 million, respectively. Leaching inventories recognized in cost of sales amounted to $189.5 million and $155.6 million for the six months June 30, 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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