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INVENTORIES (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Classes of current inventories [abstract] |  |  |
Heap leach ore | [1],[2] | $ 0.0 | $ 163.1
Stockpile ore |  | 74.3 | 23.8
Work-in-process |  | 7.7 | 18.5
Finished goods | [3] | 25.4 | 16.1
Supplies |  | 49.3 | 50.4
Inventories |  | 156.7 | 271.9
Less: non-current inventories |  | (14.9) | (78.7)
Total current inventories |  | $ 141.8 | $ 193.2
[1] | For the year ended December 31, 2018, the Company wrote down $16.9 million of heap leach inventory at Cerro San Pedro, of which $15.8 million was included in operating expenses and $1.1 million was included in depreciation and depletion, as a result of a recoverability analysis performed earlier in the year as the Company has discontinued the addition of cyanide to the heap leach pad, and as a result of Cerro San Pedro transitioning to the reclamation phase of its mine life cycle on December 31, 2018.
[2] | Non-current inventories consist of low-grade stockpiled inventories at Rainy River, of which $14.9 million are expected to be recovered after one year. As at December 31, 2017, non-current inventories of $78.7 million consisted of low-grade stockpiled inventories at Rainy River and non-current heap leach inventories at Mesquite and Cerro San Pedro.
[3] | The amount of inventories recognized in operating expenses for the year ended December 31, 2018 was $311.6 million (2017 $186.2 million).

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- Definition A classification of current inventory representing the amount of ore stockpiles. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A classification of current inventory representing the amount of supplies to be used for the production process. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_c&doctype=Standard -URIDate 2018-03-16 + Details
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