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Consolidated Statements of Comprehensive Loss - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Profit or loss [abstract]    
OPERATING REVENUES $ 821.2 $ 823.6
COST OF SALES    
Mining and processing 394.4 351.5
Inventory net realizable value adjustment (note 6) 33.9 0.0
Royalties (note 22) 9.1 11.7
Amortization 171.5 170.9
Cost of sales 608.9 534.1
EXPENSES    
Exploration 18.4 14.7
Corporate and administrative 25.9 24.5
Share-based compensation (note 13) 18.3 11.1
Impairment charge (note 14) 38.2 224.3
Total expenses 709.7 808.7
EARNINGS FROM OPERATIONS 111.5 14.9
Finance expense (5.7) (4.5)
Foreign exchange gain (loss) 1.7 (0.9)
Other loss (note 15) (5.1) (7.2)
EARNINGS BEFORE INCOME TAXES 102.4 2.3
INCOME TAXES (note 12)    
Current income tax expense (10.7) (5.3)
Deferred income tax expense (54.6) (63.7)
NET EARNINGS (LOSS) 37.1 (66.7)
Items that will not be reclassified to net earnings:    
Total other comprehensive loss (26.7) (4.3)
COMPREHENSIVE INCOME (LOSS) $ 10.4 $ (71.0)
EARNINGS (LOSS) PER SHARE (note 13)    
- basic (usd per share) $ 0.09 $ (0.17)
- diluted (usd per share) $ 0.09 $ (0.17)
Weighted average number of common shares outstanding (000's)    
- basic (in shares) 392,172 392,649
- diluted (in shares) 394,508 392,649