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FAIR VALUE MEASUREMENT (Details 1) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade and other payables [Member]    
Financial Liabilities [Abstract]    
Carrying value [1] $ 101.3 $ 146.0
Fair value [1] 101.3 146.0
Long-term debt [Member]    
Financial Liabilities [Abstract]    
Carrying value 780.5 1,007.7
Fair value 652.9 1,064.3
Gold stream obligation [Member]    
Financial Liabilities [Abstract]    
Carrying value 182.4 273.5
Fair value 182.4 273.5
Perfomance share units [Member]    
Financial Liabilities [Abstract]    
Carrying value 0.2 1.8
Fair value 0.2 1.8
Restricted share units [Member]    
Financial Liabilities [Abstract]    
Carrying value 0.3 0.8
Fair value 0.3 0.8
Copper price option contracts [Member]    
Financial Assets [Abstract]    
Carrying value 0.7
Fair value 0.7
Financial Liabilities [Abstract]    
Carrying value 0.0 4.1
Fair value 0.0 4.1
Gold price option contracts [Member]    
Financial Liabilities [Abstract]    
Carrying value 0.0
Fair value 0.0
Cash and cash equivalents [Member]    
Financial Assets [Abstract]    
Carrying value 103.7 216.2
Fair value 103.7 216.2
Trade and other receivables [Member]    
Financial Assets [Abstract]    
Carrying value 36.6 29.0
Fair value 36.6 29.0
Provisionally priced contracts [Member]    
Financial Assets [Abstract]    
Carrying value (1.6) 4.2
Fair value (1.6) 4.2
Gold and copper swap contracts [Member]    
Financial Assets [Abstract]    
Carrying value 0.9 (6.1)
Fair value 0.9 (6.1)
Investments [Member]    
Financial Assets [Abstract]    
Carrying value 0.8 1.0
Fair value 0.8 1.0
Proceeds due from income tax refunds at Mesquite [Member]    
Financial Assets [Abstract]    
Carrying value [2] 8.5 0.0
Fair value [2] $ 8.5 $ 0.0
[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.