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FAIR VALUE MEASUREMENT (Details 1) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Trade and other payables [Member]    
Financial Liabilities [Abstract]    
Carrying value [1] $ 146.0 $ 168.3
Fair value [1] 146.0 168.3
Long-term debt [Member]    
Financial Liabilities [Abstract]    
Carrying value 1,007.7 889.5
Fair value 1,064.3 920.0
Gold stream obligation [Member]    
Financial Liabilities [Abstract]    
Carrying value 273.5 246.5
Fair value 273.5 246.5
Diesel swap contracts [Member]    
Financial Liabilities [Abstract]    
Carrying value 0.1
Fair value 0.1
Perfomance share units [Member]    
Financial Liabilities [Abstract]    
Carrying value 1.8 2.1
Fair value 1.8 2.1
Restricted share units [Member]    
Financial Liabilities [Abstract]    
Carrying value 0.8 0.9
Fair value 0.8 0.9
Share Purchase Warrants [Member]    
Financial Liabilities [Abstract]    
Carrying value 1.3
Fair value 1.3
Copper price option contracts [Member]    
Financial Liabilities [Abstract]    
Carrying value 4.1
Fair value 4.1
Cash and cash equivalents [Member]    
Financial Assets [Abstract]    
Carrying value 216.2 185.9
Fair value 216.2 185.9
Trade and other receivables [Member]    
Financial Assets [Abstract]    
Carrying value 29.0 41.6
Fair value 29.0 41.6
Provisionally priced contracts [Member]    
Financial Assets [Abstract]    
Carrying value 4.2 4.5
Fair value 4.2 4.5
Gold and copper swap contracts [Member]    
Financial Assets [Abstract]    
Carrying value (6.1) (9.0)
Fair value (6.1) (9.0)
Investments [Member]    
Financial Assets [Abstract]    
Carrying value 1.0 1.1
Fair value 1.0 1.1
Gold price options [Member]    
Financial Assets [Abstract]    
Carrying value 17.6
Fair value 17.6
Copper forward contracts [Member]    
Financial Assets [Abstract]    
Carrying value 0.3
Fair value $ 0.3
[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.