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MINING INTERESTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Mining Interests [Line Items] |  |  |  |  |
Balance |  | $ 3,200.4 |  |  |
Balance |  | 1,853.4 |  | $ 3,200.4 |
Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 4,351.3 |  | 4,358.9 |
Additions |  | 214.9 |  | 728.8 |
Disposal of El Morro stream |  |  |  | (32.0) |
Disposals |  | (5.2) |  | (17.0) |
Impairment loss on held-for-sale assets | [1] |  |  | (48.6) |
Assets reclassified as held for sale | [1] |  |  | (350.0) |
Sale of Mesquite | [1] | (557.3) |  |  |
Transfers |  | 0.0 |  | (20.4) | [2]
Asset impairment |  | (1,054.8) | [3] | (268.4) |
Balance |  | 2,948.9 |  | 4,351.3 |
Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1,150.9 |  | 1,167.6 |
Depreciation for the period |  | 299.8 |  | 264.2 |
Disposals |  | (3.7) |  | (16.2) |
Assets reclassified as held for sale | [1] |  |  | (264.7) |
Sale of Mesquite | [1] | (351.5) |  |  |
Balance |  | 1,095.5 |  | 1,150.9 |
Depletable [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1,615.7 |  |  |
Balance |  | 545.7 |  | 1,615.7 |
Depletable [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 2,353.0 |  | 1,540.2 |
Additions |  | 70.8 |  | 88.8 |
Disposal of El Morro stream |  |  |  | 0.0 |
Disposals |  | (0.4) |  | 0.0 |
Impairment loss on held-for-sale assets | [1] |  |  | (48.6) |
Assets reclassified as held for sale | [1] |  |  | (178.5) |
Sale of Mesquite | [1] | (323.5) |  |  |
Transfers |  | (0.6) |  | 1,219.5 | [2]
Asset impairment |  | (836.6) | [3] | (268.4) |
Balance |  | 1,262.7 |  | 2,353.0 |
Depletable [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 737.3 |  | 734.9 |
Depreciation for the period |  | 169.1 |  | 61.7 |
Disposals |  | (0.1) |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | (159.3) |
Sale of Mesquite | [1] | (189.3) |  |  |
Balance |  | 717.0 |  | 737.3 |
Non-depletable [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 560.9 |  |  |
Balance |  | 366.5 |  | 560.9 |
Non-depletable [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 560.9 |  | 1,117.1 |
Additions |  | 23.8 |  | 65.8 |
Disposal of El Morro stream |  |  |  | (32.0) |
Disposals |  | 0.0 |  | 0.0 |
Impairment loss on held-for-sale assets | [1] |  |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | (9.8) |
Sale of Mesquite | [1] | 0.0 |  |  |
Transfers |  | 0.0 |  | (580.2) | [2]
Asset impairment |  | (218.2) | [3] | 0.0 |
Balance |  | 366.5 |  | 560.9 |
Non-depletable [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 |  | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | 0.0 |
Sale of Mesquite | [1] | 0.0 |  |  |
Balance |  | 0.0 |  | 0.0 |
Plant & equipment [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 965.7 |  |  |
Balance |  | 812.9 |  | 965.7 |
Plant & equipment [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1,379.3 |  | 959.1 |
Additions |  | 48.3 |  | 44.5 |
Disposal of El Morro stream |  |  |  | 0.0 |
Disposals |  | (4.8) |  | (17.0) |
Impairment loss on held-for-sale assets | [1] |  |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | (161.4) |
Sale of Mesquite | [1] | (232.0) |  |  |
Transfers |  | 0.6 |  | 554.1 | [2]
Asset impairment |  | 0.0 | [3] | 0.0 |
Balance |  | 1,191.4 |  | 1,379.3 |
Plant & equipment [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 413.6 |  | 432.7 |
Depreciation for the period |  | 130.7 |  | 102.5 |
Disposals |  | (3.6) |  | (16.2) |
Assets reclassified as held for sale | [1] |  |  | (105.4) |
Sale of Mesquite | [1] | (162.2) |  |  |
Balance |  | 378.5 |  | 413.6 |
Construction in Progress [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 57.0 |  |  |
Balance |  | 127.2 |  | 57.0 |
Construction in Progress [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 57.0 |  | 741.4 |
Additions |  | 72.0 |  | 529.7 |
Disposal of El Morro stream |  |  |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Impairment loss on held-for-sale assets | [1] |  |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | (0.3) |
Sale of Mesquite | [1] | (1.8) |  |  |
Transfers |  | 0.0 |  | (1,213.8) | [2]
Asset impairment |  | 0.0 | [3] | 0.0 |
Balance |  | 127.2 |  | 57.0 |
Construction in Progress [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 |  | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | 0.0 |
Sale of Mesquite | [1] | 0.0 |  |  |
Balance |  | 0.0 |  | 0.0 |
Exploration and evaluation assets [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1.1 |  |  |
Balance |  | 1.1 |  | 1.1 |
Exploration and evaluation assets [member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1.1 |  | 1.1 |
Additions |  | 0.0 |  | 0.0 |
Disposal of El Morro stream |  |  |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Impairment loss on held-for-sale assets | [1] |  |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | 0.0 |
Sale of Mesquite | [1] | 0.0 |  |  |
Transfers |  | 0.0 |  | 0.0 | [2]
Asset impairment |  | 0.0 | [3] | 0.0 |
Balance |  | 1.1 |  | 1.1 |
Exploration and evaluation assets [member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 |  | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Assets reclassified as held for sale | [1] |  |  | 0.0 |
Sale of Mesquite | [1] | 0.0 |  |  |
Balance |  | $ 0.0 |  | $ 0.0 |
[1] | Refer to Note 15 for further information on discontinued operations. Mesquite was classified as an asset held-for-sale in the third quarter of 2018 and was sold in October 2018. Peak Mines was classified as an asset held-for-sale in 2017 and was sold in April 2018.
[2] | Effective November 1, 2017, Rainy River achieved commercial production. As a result, the Company transferred amounts capitalized to construction in progress to depletable mining properties and plant & equipment and assets capitalized as non-depletable mining properties were transferred to depletable mining properties. Additionally, on November 1, 2017, the Company transferred $20.4 million related to inventories from construction in progress to current assets.
[3] | Refer to note 10 for further information on impairment.

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