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RECLAMATION AND CLOSURE COST OBLIGATIONS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | $ 124.1 | $ 81.9
Reclamation and closure costs paid | (1.2) | (1.4)
Unwinding of discount | 2.4 | 1.7
Revisions to expected cash flows | (6.3) | 55.2
Foreign exchange movement | (6.4) | 4.9
Less: amounts reclassified as held for sale | 32.0 | 1.9
Ending Balance | 92.6 | 124.1
Less: current portion of closure costs (Note 5) | (6.5) | (2.6)
Non-current portion of closure costs | 86.1 | 121.5
New Afton [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 11.6 | 7.6
Reclamation and closure costs paid | 0.0 | (0.2)
Unwinding of discount | 0.2 | 0.2
Revisions to expected cash flows | (0.3) | 3.2
Foreign exchange movement | (0.8) | 0.8
Less: amounts reclassified as held for sale | 0.0 | 0.0
Ending Balance | 10.7 | 11.6
Less: current portion of closure costs (Note 5) | 0.0 | 0.0
Non-current portion of closure costs | 10.7 | 11.6
Mesquite [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 20.5 | 13.6
Reclamation and closure costs paid | 0.0 | 0.0
Unwinding of discount | 0.4 | 0.3
Revisions to expected cash flows | (0.9) | 6.6
Foreign exchange movement | 0.0 | 0.0
Less: amounts reclassified as held for sale | (20.0) | 0.0
Ending Balance | 0.0 | 20.5
Less: current portion of closure costs (Note 5) |  | (0.2)
Non-current portion of closure costs | 0.0 | 20.3
Peak Mines [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 0.0 | 13.7
Reclamation and closure costs paid | 0.0 | (0.1)
Unwinding of discount | 0.0 | 0.4
Revisions to expected cash flows | 0.0 | 3.1
Foreign exchange movement | 0.0 | 1.1
Less: amounts reclassified as held for sale | 0.0 | (18.2)
Ending Balance | 0.0 | 0.0
Less: current portion of closure costs (Note 5) | 0.0 | 0.0
Non-current portion of closure costs | 0.0 | 0.0
Cerro San Pedro [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 19.2 | 18.1
Reclamation and closure costs paid | (0.9) | (1.0)
Unwinding of discount | 0.1 | 0.2
Revisions to expected cash flows | 1.5 | 1.2
Foreign exchange movement | 0.1 | 0.7
Less: amounts reclassified as held for sale | 0.0 | 0.0
Ending Balance | 20.0 | 19.2
Less: current portion of closure costs (Note 5) | (6.5) | (2.4)
Non-current portion of closure costs | 13.5 | 16.8
Rainy River [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 63.4 | 20.0
Reclamation and closure costs paid | (0.3) | 0.0
Unwinding of discount | 1.5 | 0.4
Revisions to expected cash flows | (6.1) | 41.4
Foreign exchange movement | (4.9) | 1.6
Less: amounts reclassified as held for sale | 0.0 | 0.0
Ending Balance | 53.6 | 63.4
Less: current portion of closure costs (Note 5) | 0.0 | 0.0
Non-current portion of closure costs | 53.6 | 63.4
Blackwater [Member] |  |
Disclosure of reclamation and closure cost obligations [Line Items] |  |
Beginning Balance | 9.4 | 8.9
Reclamation and closure costs paid | 0.0 | (0.1)
Unwinding of discount | 0.2 | 0.2
Revisions to expected cash flows | (0.5) | (0.3)
Foreign exchange movement | (0.8) | 0.7
Less: amounts reclassified as held for sale | 0.0 | 0.0
Ending Balance | 8.3 | 9.4
Less: current portion of closure costs (Note 5) | 0.0 | 0.0
Non-current portion of closure costs | $ 8.3 | $ 9.4

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