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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
REVENUES    
Revenues from mining operations (note 17) $ 2,242,604 $ 2,138,232
COSTS, EXPENSES AND OTHER INCOME    
Production(i) [1] 1,057,842 1,031,892
Exploration and corporate development 141,450 146,978
Amortization of property, plant and mine development (note 10) 508,739 613,160
General and administrative 115,064 102,781
Impairment loss on available-for- sale securities (note 8) 8,532  
Finance costs (note 14) 78,931 74,641
Gain on derivative financial instruments (note 20) (20,990) (9,468)
Gain on sale of available-for-sale securities (note 8) (168) (3,500)
Environmental remediation (note 12) 1,219 4,058
Gain on impairment reversal (note 22)   (120,161)
Foreign currency translation loss 13,313 13,157
Other (income) expenses (3,709) 16,233
Income before income and mining taxes 342,381 268,461
Income and mining taxes expense (note 23) 98,494 109,637
Net income for the year $ 243,887 $ 158,824
Net income per share - basic (note 16) $ 1.06 $ 0.71
Net income per share - diluted (note 16) 1.05 0.70
Cash dividends declared per common share $ 0.41 $ 0.36
COMPREHENSIVE INCOME    
Net income for the year $ 243,887 $ 158,824
Available-for-sale securities and other investments (note 8):    
Unrealized change in fair value of available- for- sale securities (21,179) 36,757
Reclassification to impairment loss on available- for- sale securities 8,532  
Reclassification to gain on sale of available- for- sale securities (168) (3,500)
Derivative financial instruments (note 20): unrealized gain 10,763  
Income tax impact of reclassification items (note 23) (1,117) 467
Income tax impact of other comprehensive income (loss) items (note 23) 1,390 (4,925)
Total (1,779) 28,799
Pension benefit obligations:    
Remeasurement (loss) gain of pension benefit obligations (note 15(a)) (1,772) 612
Income tax impact (note 23) 399 76
Total (1,373) 688
Other comprehensive income (loss) for the year (3,152) 29,487
Comprehensive income for the year $ 240,735 $ 188,311
[1] Exclusive of amortization, which is shown separately.