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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair value measurement [Abstract] |
Disclosure of detailed information about financial assets and liabilities by category and information about financial assets and liabilities measured at fair value on recurring basis [Text Block] | The following table summarizes the Company’s financial assets and liabilities by category and information about financial assets and liabilities measured at fair value on a recurring basis in the statement of financial position categorized by level of significance of the inputs used in making the measurements:
| As at December 31, 2017 | As at December 31, 2016
(in millions of U.S. dollars) | Category | Level |  | Level |
FINANCIAL ASSETS |  |  |  |  |
Cash and cash equivalents | Loans and receivables at amortized cost |  | 216.2 |  | 185.9
Trade and other receivables | Loans and receivables at amortized cost |  | 29.0 |  | 41.6
Provisionally priced contracts | Financial instruments at FVTPL | 2 | 4.2 | 2 | 4.5
Gold and copper swap contracts | Financial instruments at FVTPL | 2 | (6.1) | 2 | (9.0)
Gold price option contracts | Financial Instruments at FVTPL | 2 | - | 2 | 17.6
Investments | Financial instruments at FVTPL | 1 | 1.0 | 1 | 1.1
Copper forward contracts | Financial instruments at FVTPL | 2 | - | 2 | 0.3
FINANCIAL LIABILITIES |  |  |  |  |
Trade and other payables(1) | Financial liabilities at amortized cost |  | 146.0 |  | 168.3
Long-term debt | Financial liabilities at amortized cost |  | 1,007.7 |  | 889.5
Warrants | Financial Instruments at FVTPL | 1 | - | 1 | 1.3
Gold stream obligation | Financial Instruments at FVTPL | 3 | 273.5 | 3 | 246.5
Diesel swap contracts | Financial liability at fair value through OCI | 2 | - | 2 | 0.1
Performance share units | Financial Instruments at FVTPL | 3 | 1.8 | 3 | 2.1
Restricted share units | Financial instruments at FVTPL | 1 | 0.8 | 1 | 0.9
Copper price option contracts | Financial instruments at FVTPL | 2 | 4.1 | 2 | -
| 1. | Trade and other payables exclude the short-term portion of reclamation and closure cost obligations, copper forward contracts and the short-term portion of the gold stream obligation.
Disclosure of detailed information about carrying values and fair values of financial instruments [Text Block] | The carrying values and fair values of the Company’s financial instruments are as follows:
As at December 31, 2017 | As at December 31, 2016
(in millions of U.S. dollars) | Carrying value | Fair value | Carrying value | Fair value
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 216.2 | 216.2 | 185.9 | 185.9
Trade and other receivables | 29.0 | 29.0 | 41.6 | 41.6
Provisionally priced contracts | 4.2 | 4.2 | 4.5 | 4.5
Gold and copper swap contracts | (6.1) | (6.1) | (9.0) | (9.0)
Investments | 1.0 | 1.0 | 1.1 | 1.1
Gold price option contracts | - | - | 17.6 | 17.6
Copper forward contracts | - | - | 0.3 | 0.3
FINANCIAL LIABILITIES |  |  |  |
Trade and other payables(1) | 146.0 | 146.0 | 168.3 | 168.3
Long-term debt | 1,007.7 | 1,064.3 | 889.5 | 920.0
Gold stream obligation | 273.5 | 273.5 | 246.5 | 246.5
Share purchase warrants | - | - | 1.3 | 1.3
Diesel swap contracts | - | - | 0.1 | 0.1
Performance share units | 1.8 | 1.8 | 2.1 | 2.1
Restricted share units | 0.8 | 0.8 | 0.9 | 0.9
Copper price option contracts | 4.1 | 4.1 | - | -
| 1. | Trade and other payables exclude the short-term portion of reclamation and closure cost obligation, copper price option contracts and the short-term portion of the gold stream obligation.

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- Definition The disclosure of detailed information about financial assets and liabilities by category and information about financial assets and liabilities measured at fair value on recurring basis[Text block] + References No definition available. + Details
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