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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 |  |  |  |  |  |

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