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MINING INTERESTS (Details 1) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | $ 1,853.4 |  | $ 3,200.4
New Afton [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 656.0 |  | 785.5
Mesquite [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  |  |  | 236.2
Cerro San Pedro [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 | [1] | 0.6
Rainy River [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 853.9 |  | 1,621.4
Blackwater [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 340.3 |  | 552.1
Other [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment | [2] | 3.2 |  | 4.6
Non-depletable [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 366.5 |  | 560.9
Non-depletable [Member] | New Afton [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 26.1 |  | 22.9
Non-depletable [Member] | Mesquite [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  |  |  | 0.0
Non-depletable [Member] | Cerro San Pedro [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 | [1] | 0.0
Non-depletable [Member] | Rainy River [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 14.3 |  | 0.5
Non-depletable [Member] | Blackwater [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 326.1 |  | 537.5
Non-depletable [Member] | Other [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment | [2] | 1.1 |  | 1.1
Plant and Equipment [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 812.9 |  | 965.7
Plant and Equipment [Member] | New Afton [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 191.6 |  | 225.7
Plant and Equipment [Member] | Mesquite [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  |  |  | 83.5
Plant and Equipment [Member] | Cerro San Pedro [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 | [1] | 0.0
Plant and Equipment [Member] | Rainy River [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 605.0 |  | 633.6
Plant and Equipment [Member] | Blackwater [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 14.2 |  | 14.6
Plant and Equipment [Member] | Other [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment | [2] | 2.1 |  | 3.5
Construction in Progress [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 127.2 |  | 57.0
Construction in Progress [Member] | New Afton [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 16.4 |  | 15.1
Construction in Progress [Member] | Mesquite [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  |  |  | 2.7
Construction in Progress [Member] | Cerro San Pedro [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 | [1] | 0.0
Construction in Progress [Member] | Rainy River [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 110.8 |  | 39.2
Construction in Progress [Member] | Blackwater [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 |  | 0.0
Construction in Progress [Member] | Other [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment | [2] | 0.0 |  | 0.0
Depletable [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 545.7 |  | 1,615.7
Depletable [Member] | New Afton [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 421.9 |  | 521.8
Depletable [Member] | Mesquite [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  |  |  | 150.0
Depletable [Member] | Cerro San Pedro [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 | [1] | 0.6
Depletable [Member] | Rainy River [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 123.8 |  | 948.1
Depletable [Member] | Blackwater [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment |  | 0.0 |  | 0.0
Depletable [Member] | Other [Member] |  |  |  |
Mining Interests [Line Items] |  |  |  |
Property, plant and equipment | [2] | $ 0.0 |  | $ 0.0
[1] | Cerro San Pedro transitioned to the reclamation phase of its mine life cycle on December 31, 2018. As a result, Cerro San Pedro’s mining interests are fully amortized as at December 31, 2018.
[2] | Other includes corporate balances and exploration properties.

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