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RECLAMATION AND CLOSURE COST OBLIGATIONS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | $ 81.9 | $ 68.8
Reclamation and closure costs paid | (1.4) | (2.4)
Unwinding of discount | 1.3 | 1.4
Revisions to expected cash flows | 55.2 | 15.5
Foreign exchange movement | 4.9 | (1.5)
Less: amounts reclassified as held for sale | (18.2) | 0.0
Ending Balance | 124.1 | 81.9
Less: current portion of closure costs (Note 8) | 2.6 | 0.9
Non-current portion of closure costs | 121.5 | 81.0
New Afton [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 7.6 | 7.4
Reclamation and closure costs paid |  |
Unwinding of discount | 0.2 | 0.1
Revisions to expected cash flows | 3.2 | (0.1)
Foreign exchange movement |  | 0.2
Less: amounts reclassified as held for sale |  |
Ending Balance | 11.6 | 7.6
Less: current portion of closure costs (Note 8) |  |
Non-current portion of closure costs | 11.6 | 7.6
Mesquite [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 13.6 | 13.2
Reclamation and closure costs paid |  |
Unwinding of discount | 0.3 | 0.2
Revisions to expected cash flows | 6.6 | 0.2
Foreign exchange movement |  |
Less: amounts reclassified as held for sale |  |
Ending Balance | 20.5 | 13.6
Less: current portion of closure costs (Note 8) | (0.2) |
Non-current portion of closure costs | 20.3 | 13.6
Peak Mines [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 13.7 | 14.2
Reclamation and closure costs paid | (0.1) |
Unwinding of discount | 0.4 | 0.3
Revisions to expected cash flows | 3.1 | (0.7)
Foreign exchange movement | 1.1 | (0.1)
Less: amounts reclassified as held for sale | (18.2) |
Ending Balance |  | 13.7
Less: current portion of closure costs (Note 8) |  | (0.1)
Non-current portion of closure costs |  | 13.6
Cerro San Pedro [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 18.1 | 17.8
Reclamation and closure costs paid | (1.0) | (2.6)
Unwinding of discount | 0.2 | 0.7
Revisions to expected cash flows | 1.2 | 4.2
Foreign exchange movement | 0.7 | (2.0)
Less: amounts reclassified as held for sale |  |
Ending Balance | 19.2 | 18.1
Less: current portion of closure costs (Note 8) | (2.4) | (0.8)
Non-current portion of closure costs | 16.8 | 17.3
Rainy River [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 20.0 | 7.9
Reclamation and closure costs paid |  |
Unwinding of discount | 0.4 | 0.2
Revisions to expected cash flows | 41.4 | 11.8
Foreign exchange movement | 1.6 | 0.1
Less: amounts reclassified as held for sale |  |
Ending Balance | 63.4 | 20.0
Less: current portion of closure costs (Note 8) |  |
Non-current portion of closure costs | 63.4 | 20.0
Blackwater [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 8.9 | 8.3
Reclamation and closure costs paid | (0.1) |
Unwinding of discount | 0.2 | 0.2
Revisions to expected cash flows | (0.3) | 0.1
Foreign exchange movement | 0.7 | 0.3
Less: amounts reclassified as held for sale |  |
Ending Balance | 9.4 | 8.9
Less: current portion of closure costs (Note 8) |  | 0.0
Non-current portion of closure costs | $ 9.4 | $ 8.9

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