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MINING INTERESTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Mining Interests [Line Items] |  |  |  |  |
Balance | [1] | $ 3,191.3 |  |  |
Balance |  | 3,200.4 |  | $ 3,191.3 | [1]
Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1,540.2 |  | 1,459.5 |
Additions |  | 728.8 |  | 689.7 |
Disposal of El Morro stream |  | (32.0) |  |  |
Disposals |  | (17.0) |  | (13.6) |
Decrease through classified as held for sale, property, plant and equipment | [2] | (178.5) |  |  |
Impairment loss on held-for-sale assets | [2] | (48.6) |  |  |
Transfers |  | 1,219.5 | [3] | 23.7 |
Impairments |  | (268.4) | [4] | (6.4) |
Balance |  | 2,353.0 |  | 1,540.2 |
Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 734.9 | [1] | 541.8 |
Depreciation for the period |  | 264.2 |  | 193.1 |
Disposals |  | (16.2) |  | (12.2) |
Decrease through classified as held for sale, property, plant and equipment | [2] | (159.3) |  |  |
Balance |  | 737.3 |  | 734.9 | [1]
Mining Properties Non-depletable Including Exploration and Evaluation [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance | [1] | 1,117.1 |  |  |
Balance |  | 560.9 |  | 1,117.1 | [1]
Mining Properties Non-depletable Including Exploration and Evaluation [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1,117.1 |  | 1,020.9 |
Additions |  | 65.8 |  | 90.2 |
Disposal of El Morro stream |  | (32.0) |  |  |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | (9.8) |  |  |
Impairment loss on held-for-sale assets | [2] | 0.0 |  |  |
Transfers |  | (580.2) | [3] | 6.0 |
Impairments |  | 0.0 | [4] | 0.0 |
Balance |  | 560.9 |  | 1,117.1 |
Mining Properties Non-depletable Including Exploration and Evaluation [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 | [1] | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | 0.0 |  |  |
Balance |  | 0.0 |  | 0.0 | [1]
Plant & equipment [Member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance | [1] | 526.4 |  |  |
Balance |  | 965.7 |  | 526.4 | [1]
Plant & equipment [Member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 959.1 |  | 875.8 |
Additions |  | 44.5 |  | 32.6 |
Disposal of El Morro stream |  | 0.0 |  |  |
Disposals |  | (17.0) |  | (13.6) |
Decrease through classified as held for sale, property, plant and equipment | [2] | (161.4) |  |  |
Impairment loss on held-for-sale assets | [2] | 0.0 |  |  |
Transfers |  | 554.1 | [3] | 64.3 |
Impairments |  | 0.0 | [4] | 0.0 |
Balance |  | 1,379.3 |  | 959.1 |
Plant & equipment [Member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 432.7 | [1] | 344.2 |
Depreciation for the period |  | 102.5 |  | 100.7 |
Disposals |  | (16.2) |  | (12.2) |
Decrease through classified as held for sale, property, plant and equipment | [2] | (105.4) |  |  |
Balance |  | 413.6 |  | 432.7 | [1]
Construction in progress [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance | [1] | 741.4 |  |  |
Balance |  | 57.0 |  | 741.4 | [1]
Construction in progress [member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 741.4 |  | 325.5 |
Additions |  | 529.7 |  | 509.9 |
Disposal of El Morro stream |  | 0.0 |  |  |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | (0.3) |  |  |
Impairment loss on held-for-sale assets | [2] | 0.0 |  |  |
Transfers |  | (1,213.8) | [3] | (94.0) |
Impairments |  | 0.0 | [4] | 0.0 |
Balance |  | 57.0 |  | 741.4 |
Construction in progress [member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 | [1] | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | 0.0 |  |  |
Balance |  | 0.0 |  | 0.0 | [1]
Exploration and evaluation assets [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance | [1] | 1.1 |  |  |
Balance |  | 1.1 |  | 1.1 | [1]
Exploration and evaluation assets [member] | Gross carrying amount [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 1.1 |  | 7.5 |
Additions |  | 0.0 |  | 0.0 |
Disposal of El Morro stream |  | 0.0 |  |  |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | 0.0 |  |  |
Impairment loss on held-for-sale assets | [2] | 0.0 |  |  |
Transfers |  | 0.0 | [3] | 0.0 |
Impairments |  | 0.0 | [4] | (6.4) |
Balance |  | 1.1 |  | 1.1 |
Exploration and evaluation assets [member] | Accumulated depreciation and amortisation [member] |  |  |  |  |
Mining Interests [Line Items] |  |  |  |  |
Balance |  | 0.0 | [1] | 0.0 |
Depreciation for the period |  | 0.0 |  | 0.0 |
Disposals |  | 0.0 |  | 0.0 |
Decrease through classified as held for sale, property, plant and equipment | [2] | 0.0 |  |  |
Balance |  | $ 0.0 |  | $ 0.0 | [1]
[1] | Prior-year period comparatives have been revised as per note 5.
[2] | Refer to Note 16 for further information on assets and liabilities held for sale.
[3] | 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.
[4] | Refer to note 11 for further information on impairment.

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