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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 | As at December 31, 2017
(in millions of U.S. dollars) | Category | Level |  | Level |
FINANCIAL ASSETS |  |  |  |  |
Cash and cash equivalents | Financial assets at amortized cost |  | 103.7 |  | 216.2
Trade and other receivables | Financial assets at amortized cost |  | 36.6 |  | 29.0
Provisionally priced contracts | Financial instruments at FVTPL | 2 | (1.6) | 2 | 4.2
Gold and copper swap contracts | Financial instruments at FVTPL | 2 | 0.9 | 2 | (6.1)
Copper price option contracts | Financial Instruments at FVTPL | 2 | 0.7 | 2 | -
Proceeds due from income tax refunds at Mesquite (2) | Financial Instruments at FVTPL | 3 | 8.5 | 3 | -
Investments | Financial instruments at FVTPL | 1 | 0.8 | 1 | 1.0
FINANCIAL LIABILITIES |  |  |  |  |
Trade and other payables (1) | Financial liabilities at amortized cost |  | 101.3 |  | 146.0
Long-term debt | Financial liabilities at amortized cost |  | 780.5 |  | 1,007.7
Gold stream obligation | Financial instruments at FVTPL | 3 | 182.4 | 3 | 273.5
Performance share units | Financial instruments at FVTPL | 3 | 0.2 | 3 | 1.8
Restricted share units | Financial instruments at FVTPL | 1 | 0.3 | 1 | 0.8
Copper price option contracts | Financial instruments at FVTPL | 2 | - | 2 | 4.1
Gold price option contracts | Financial instruments at FVTPL | 2 | 4.8 | 2 | -
| 1. | Trade and other payables exclude the short-term portion of reclamation and closure cost obligations and the short-term portion of the gold stream obligation.
| 2. | Proceeds due from income tax refunds at Mesquite are included in other non-current assets on the consolidated statement of financial position.
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, 2018 | As at December 31, 2017
(in millions of U.S. dollars) | Carrying value | Fair value | Carrying value | Fair value
FINANCIAL ASSETS |  |  |  |
Cash and cash equivalents | 103.7 | 103.7 | 216.2 | 216.2
Trade and other receivables | 36.6 | 36.6 | 29.0 | 29.0
Provisionally priced contracts | (1.6) | (1.6) | 4.2 | 4.2
Gold and copper swap contracts | 0.9 | 0.9 | (6.1) | (6.1)
Investments | 0.8 | 0.8 | 1.0 | 1.0
Copper price option contracts | 0.7 | 0.7 | - | -
Proceeds due from income tax refunds at Mesquite (2) | 8.5 | 8.5 | - | -
FINANCIAL LIABILITIES |  |  |  |
Trade and other payables (1) | 101.3 | 101.3 | 146.0 | 146.0
Long-term debt | 780.5 | 652.9 | 1,007.7 | 1,064.3
Gold stream obligation | 182.4 | 182.4 | 273.5 | 273.5
Performance share units | 0.2 | 0.2 | 1.8 | 1.8
Restricted share units | 0.3 | 0.3 | 0.8 | 0.8
Copper price option contracts | - | - | 4.1 | 4.1
Gold price option contracts | 4.8 | 4.8 | - | -
| 1. | Trade and other payables exclude the short-term portion of reclamation and closure cost obligation and the short-term portion of the gold stream obligation.
| 2. | Proceeds due from income tax refunds at Mesquite are included in other non-current assets on the consolidated statement of financial position.

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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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