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Consolidated Statements of Changes in Equity
$ in Thousands
Issued capital [member]
USD ($)
shares
Equity reserve [member]
USD ($)
Hedging reserve [member]
USD ($)
Fair value reserve [member]
USD ($)
Foreign currency reserves [member]
USD ($)
Retained earnings [member]
USD ($)
USD ($)
Equity at beginning of period at Dec. 31, 2015 $ 203,953 $ 14,169 $ (307)   $ 1,115 $ 45,238 $ 264,168
Equity at beginning of period, shares at Dec. 31, 2015 | shares 129,240,567            
Net income for the period           17,858 17,858
Other comprehensive income     85 $ 334     419
Comprehensive income for the year     85 334   17,858 18,277
Issuance of common shares $ 122,813           122,813
Issuance of common shares, shares | shares 14,569,045            
Exercise of warrants $ 8,733 (4,552)         4,181
Exercise of warrants, shares | shares 931,700            
Exercise of stock options $ 8,464 (2,621)         5,843
Exercise of stock options, shares | shares 2,236,861            
Share-based payments (note 22)   468         468
Issuance of warrants   7,401         7,401
Subtotal of transactions with owners of the Company $ 140,010 696         140,706
Subtotal of transactions with owners of the Company, shares | shares 17,737,606            
Equity at end of period at Dec. 31, 2016 $ 343,963 14,865 (222) 334 1,115 63,096 423,151
Equity at end of period, shares at Dec. 31, 2016 | shares 146,978,173            
Net income for the period           66,305 66,305
Other comprehensive income     369 (307)     62
Comprehensive income for the year     369 (307)   66,305 66,367
Issuance of common shares $ 74,804           74,804
Issuance of common shares, shares | shares 11,873,750            
Share issuance costs $ (5,018)           (5,018)
Exercise of warrants $ 2,168 (1,084)         1,084
Exercise of warrants, shares | shares 238,515            
Exercise of stock options $ 1,123 (325)         798
Exercise of stock options, shares | shares 307,160            
Issuance of shares for mineral property $ 1,128           1,128
Issuance of shares for mineral property, shares | shares 239,385            
Share-based payments (note 22)   1,270         1,270
Subtotal of transactions with owners of the Company $ 74,205 (139)         74,066
Subtotal of transactions with owners of the Company, shares | shares 12,658,810            
Equity at end of period at Dec. 31, 2017 $ 418,168 $ 14,726 $ 147 $ 27 $ 1,115 $ 129,401 $ 563,584
Equity at end of period, shares at Dec. 31, 2017 | shares 159,636,983