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Consolidated Income Statements - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue    
Metal sales $ 391,406 $ 432,727
Cost of sales    
Production costs 192,740 194,669
Inventory write-down 444 0
Depreciation and amortization 72,130 74,887
Cost of sales 265,314 269,556
Gross profit 126,092 163,171
Exploration expenses 38,261 18,773
Mine standby costs 4,886 16,140
Other operating items 3,658  
General and administrative expenses 54,574 37,851
Acquisition costs 4,270  
Defined benefit pension plan expense 3,451 5,602
Share based payments 11,218 10,559
Write-down of assets 46,697 4,529
Foreign exchange loss (gain) (2,382) 2,708
Operating profit (loss) (38,541) 67,009
Loss on disposal of assets (462) (2,121)
Gain (loss) on marketable securities and other investments 27,425 (4,881)
Other income 17,575 243
Asset retirement obligation accretion (2,006) (1,795)
Interest and financing costs (3,199) (9,757)
Profit from continuing operations before income tax 792 48,698
Income tax expense 19,383 56,205
Loss from continuing operations (18,591) (7,507)
Loss from discontinued operations (2,797) (339,369)
Loss for the year (21,388) (346,876)
Attributable to:    
Shareholders of the Company (9,935) (344,151)
Non-controlling interests (11,453) (2,725)
Loss for the year (21,388) (346,876)
Loss attributable to shareholders of the Company    
Continuing operations (7,138) (2,683)
Discontinued operations (2,797) (341,468)
Shareholders of the Company $ (9,935) $ (344,151)
Weighted average number of shares outstanding (thousands)    
Basic 753,565 716,587
Diluted 753,565 716,593
Loss per share attributable to shareholders of the Company:    
Basic loss per share $ (0.01) $ (0.48)
Diluted loss per share (0.01) (0.48)
Loss per share attributable to shareholders of the Company-continuing operations:    
Basic loss per share (0.01) 0.00
Diluted loss per share $ (0.01) $ 0.00