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INVENTORIES: (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Metals at average cost: |  |  |
Finished goods | $ 59.3 |  | $ 48.8
Work-in-process | 308.9 |  | 308.0
Ore stockpiles on leach pads | 316.5 |  | 320.9
Supplies at average cost | 365.1 |  | 364.2
Total current inventory | 1,049.8 |  | 1,041.9
Inventory, non-current: |  |  |
Ore stockpiles on leach pads | 1,028.9 |  | $ 977.4
Total leaching costs capitalized as non-current inventory of ore stockpiles | 126.5 | $ 120.8 |
Long-term leaching inventories recognized as cost of sales | $ 79.5 | $ 82.1 |

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details
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