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INVENTORIES (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
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).