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DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
DERIVATIVE ASSETS    
Derivative financial assets $ 0.7 $ 0.0
DERIVATIVE LIABILITIES    
Total derivative liabilities 5.5 6.0
Unsettled provisionally priced concentrate derivatives, and swap contracts    
DERIVATIVE LIABILITIES    
Derivative financial liabilities [1] 0.7 1.9
Copper price option contract    
DERIVATIVE ASSETS    
Derivative financial assets [2] 0.7 0.0
DERIVATIVE LIABILITIES    
Derivative financial liabilities [2] 0.0 4.1
Gold Price Option Contract    
DERIVATIVE LIABILITIES    
Derivative financial liabilities [2] $ 4.8 $ 0.0
[1] Unsettled provisionally priced concentrate derivatives are included within trade and other receivables in the statement of financial position.
[2] As at December 31, 2018, copper price option contracts are included within prepaids and other in the statement of financial position and gold price option contracts are included within trade and other payables in the statement of financial position. As at December 31, 2017, copper price option contracts are included within trade and other payables in the statement of financial position.