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FAIR VALUE MEASUREMENT (Tables)
 12 Months Ended
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 equivalentsFinancial assets at amortized cost 
 103.7
  216.2
Trade and other receivablesFinancial assets at amortized cost 
 36.6
  29.0
Provisionally priced contractsFinancial instruments at FVTPL
2
 (1.6)
2 4.2
Gold and copper swap contractsFinancial instruments at FVTPL
2
 0.9
2 (6.1)
Copper price option contractsFinancial Instruments at FVTPL
2
 0.7
2-
Proceeds due from income tax refunds at Mesquite
(2)
Financial Instruments at FVTPL
3
 8.5
3-
InvestmentsFinancial instruments at FVTPL
1
 0.8
11.0
FINANCIAL LIABILITIES
     
Trade and other payables
(1)
Financial liabilities at amortized cost 
 101.3
  146.0
Long-term debtFinancial liabilities at amortized cost 
 780.5
  1,007.7
Gold stream obligationFinancial instruments at FVTPL
3
 182.4
3 273.5
Performance share unitsFinancial instruments at FVTPL
3
 0.2
31.8
Restricted share unitsFinancial instruments at FVTPL
1
 0.3
10.8
Copper price option contractsFinancial instruments at FVTPL
2
-
24.1
Gold price option contractsFinancial 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  
-
-
4.14.1
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.