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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities    
Loss for the year from continuing operations $ (379,631) $ (18,591)
Items not affecting cash:    
Asset retirement obligation accretion 2,038 2,006
Depreciation and amortization 105,732 72,130
Unrealized foreign exchange gain 704 (471)
Deferred income tax recovery (118,839) (19,849)
Loss (gain) on disposal of assets (130) 462
Gain on derivatives and other investments (665) (27,425)
Impairment of property, plant, and equipment 447,808 0
Other write-down of assets 1,528 46,697
Share based payments 6,989 11,218
Defined benefit pension plan expense 3,555 3,451
Adjustments to reconcile profit (loss) other than changes in working capital 69,089 69,628
Property reclamation payments (5,536) (3,097)
Severance payments (2,299) 0
Changes in non-cash working capital 5,062 (35,755)
Net cash provided by operating activities of continuing operations 66,316 30,776
Net cash used by operating activities of discontinued operations 0 (2,797)
Investing activities    
Net cash paid on acquisition of subsidiary 0 (121,664)
Purchase of property, plant and equipment (274,070) (309,133)
Capitalised interest (36,750) (36,750)
Proceeds from the sale of property, plant and equipment 7,882 252
Proceeds on pre-commercial production sales 48,868 38,200
Value added taxes related to mineral property expenditures, net (1,261) 22,804
Investment in term deposits (1,138) (216)
Increase in restricted cash (928) (9,817)
Net cash used by investing activities of continuing operations (257,397) (416,324)
Financing activities    
Issuance of common shares for cash 0 586
Dividend paid to shareholders 0 (10,610)
Purchase of treasury stock (2,108) (5,301)
Net cash used by financing activities of continuing operations (2,108) (15,325)
Net decrease in cash and cash equivalents (193,189) (403,670)
Cash and cash equivalents - beginning of year 479,501 883,171
Cash and cash equivalents - end of year $ 286,312 $ 479,501