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Consolidated Statements of Changes in Equity | 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, 2016 | $ 343,963,000 | $ 14,865,000 | $ (222,000) | $ 334,000 | $ 1,115,000 | $ 63,096,000 | $ 423,151,000
Equity at beginning of period, shares at Dec. 31, 2016 | shares | 146,978,173 |  |  |  |  |  |
Net income for the period |  |  |  |  |  | 66,305,000 | 66,305,000
Other comprehensive income |  |  | 369,000 | (307,000) |  |  | 62,000
Comprehensive income for the year |  |  | 369,000 | (307,000) |  | 66,305,000 | 66,367,000
Issuance of common shares | $ 69,786,000 |  |  |  |  |  | 69,786,000
Issuance of common shares, shares | shares | 11,873,750 |  |  |  |  |  |
Issuance of shares for mineral property | $ 1,128,000 |  |  |  |  |  | 1,128,000
Issuance of shares for mineral property, shares | 239,385 |  |  |  |  |  |
Exercise of warrants (note 22c) | $ 2,168,000 | (1,084,000) |  |  |  |  | 1,084,000
Exercise of warrants, shares (note 22c) | 238,515 |  |  |  |  |  |
Exercise of stock options | $ 1,123,000 | (325,000) |  |  |  |  | 798,000
Exercise of stock options, shares | 307,160 |  |  |  |  |  |
Share-based payments (note 21) |  | 1,270,000 |  |  |  |  | 1,270,000
Subtotal of transactions with owners of the Company | $ 74,205,000 | (139,000) |  |  |  |  | 74,066,000
Subtotal of transactions with owners of the Company, shares | shares | 12,658,810 |  |  |  |  |  |
Equity at end of period at Dec. 31, 2017 | $ 418,168,000 | 14,726,000 | 147,000 | 27,000 | 1,115,000 | 129,401,000 | 563,584,000
Equity at end of period, shares at Dec. 31, 2017 | shares | 159,636,983 |  |  |  |  |  |
Net income for the period |  |  |  |  |  | 33,990,000 | 33,990,000
Other comprehensive income |  |  | (156,000) | (69,000) |  |  | (225,000)
Comprehensive income for the year |  |  | (156,000) | (69,000) |  | 33,990,000 | 33,765,000
Exercise of warrants (note 22c) | $ 1,890,000 | (944,000) |  |  |  |  | 946,000
Exercise of warrants, shares (note 22c) | 204,462 |  |  |  |  |  |
Exercise of stock options | $ 21,000 | (8,000) |  |  |  |  | 13,000
Exercise of stock options, shares | 20,000 |  |  |  |  |  |
Shares issued for share units | $ 388,000 | (388,000) |  |  |  |  |
Shares issued for share units (in shares) | 78,150 |  |  |  |  |  |
Share-based payments (note 21) |  | 4,496,000 |  |  |  |  | 4,496,000
Subtotal of transactions with owners of the Company | $ 2,299,000 | 3,156,000 |  |  |  |  | 5,455,000
Subtotal of transactions with owners of the Company, shares | shares | 302,612 |  |  |  |  |  |
Equity at end of period at Dec. 31, 2018 | $ 420,467,000 | $ 17,882,000 | $ (9,000) | $ (42,000) | $ 1,115,000 | $ 163,391,000 | $ 602,804,000
Equity at end of period, shares at Dec. 31, 2018 | shares | 159,939,595 |  |  |  |  |  |

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