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INVENTORIES: (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Metals at average cost: |  |  |
Finished goods | $ 154.9 |  | $ 130.5
Work-in-process | 181.5 |  | 231.6
Ore stockpiles on leach pads | 308.4 |  | 310.9
Supplies at average cost: | 335.1 |  | 337.4
Total current inventory | 979.9 |  | 1,010.4
Inventory, non-current: |  |  |
Ore stockpiles on leach pads | 848.2 |  | $ 806.9
Total leaching costs capitalized as long-term inventory of ore stockpiles on leach pads | 120.8 | $ 124.8 |
Leaching inventories recognized in cost of sales | $ 82.1 | $ 79.2 |

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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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