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TRADE AND OTHER RECEIVABLES (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Trade and other receivables [abstract]    
Trade receivables $ 3.8 $ 27.4
Sales tax receivable 22.7 11.8
Unsettled provisionally priced concentrate derivatives and copper swap contracts (Note 14) (1.9) (4.5)
Other 2.5 2.4
Total trade and other receivables $ 27.1 $ 37.1