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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue    
Metal sales $ 459,016 $ 391,406
Cost of sales    
Production costs 267,980 192,740
Inventory write-down 1,465 444
Depreciation and amortization 105,732 72,130
Cost of sales 375,177 265,314
Earnings from mine operations 83,839 126,092
Exploration and evaluation expenses 33,842 38,261
Mine standby costs 16,510 4,886
Other operating items 0 3,658
General and administrative expenses 46,806 54,574
Acquisition costs 0 4,270
Defined benefit pension plan expense 3,555 3,451
Share based payments 6,989 11,218
Impairment of property, plant, and equipment 447,808 0
Other write-down of assets 1,528 46,697
Foreign exchange loss (gain) 3,574 (2,382)
Loss from operations (476,773) (38,541)
Gain (loss) on disposal of assets 130 (462)
Gain on derivatives and other investments 665 27,425
Other income 16,151 17,575
Asset retirement obligation accretion (2,038) (2,006)
Interest and financing costs (4,264) (3,199)
Earnings (loss) from continuing operations before income tax (466,129) 792
Income tax expense (recovery) (86,498) 19,383
Loss from continuing operations (379,631) (18,591)
Loss from discontinued operations 0 (2,797)
Net loss for the year (379,631) (21,388)
Attributable to:    
Shareholders of the Company (361,884) (9,935)
Non-controlling interests (17,747) (11,453)
Net loss for the year (379,631) (21,388)
Net loss attributable to shareholders of the Company:    
Continuing operations (361,884) (7,138)
Discontinued operations 0 (2,797)
Shareholders of the Company $ (361,884) $ (9,935)
Weighted average number of shares outstanding    
Basic (in shares) 158,509 150,531
Diluted (in shares) 158,509 150,531
Net loss per share attributable to shareholders of the Company:    
Basic loss per share (USD per share) $ (2.28) $ (0.07)
Diluted loss per share (USD per share) (2.28) (0.07)
Net loss per share attributable to shareholders of the Company - continuing operations:    
Basic loss per share (USD per share) (2.28) (0.05)
Diluted loss per share (USD per share) $ (2.28) $ (0.05)