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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
CHANGE IN NON-CASH OPERATING WORKING CAPITAL    
Trade and other receivables $ 4.4 $ (5.4)
Inventories 16.2 (53.1)
Prepaid expenses and other (2.3) (0.6)
Trade and other payables 7.6 (12.5)
Total change in non-cash operating working capital 25.9 (71.6)
OTHER NON-CASH ADJUSTMENTS    
Unrealized loss on concentrate contracts (0.2) 0.7
Equity settled share-based payment expense 0.7 2.7
Loss on disposal of assets 1.2 0.3
Settlement and loss on revaluation of gold price option contracts 21.7 4.8
Unrealized gain on gold stream obligation (20.1) (11.7)
Settlement (gain) loss on revaluation of copper price option contracts 0.7 (4.8)
Revaluation of CSP's reclamation and closure cost obligation (0.6) 1.0
Inventory write-downs 14.1 15.8
Other non-cash adjustments 0.0 0.2
Total other non-cash adjustments $ 17.5 $ 9.0