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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Shares and Additional Paid-in Capital Flow-through common shares | Common Shares and Additional Paid-in Capital | Retained Earnings [Member] | Noncontrolling Interest | Flow-through common shares | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  | $ 1,530,702 | $ (1,031,223) |  |  | $ 499,479
Balance (in shares) at Dec. 31, 2019 |  | 400,339,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 332 |  |  |  | 332
Exercise of stock options |  | $ 61 |  |  |  | $ 61
Exercise of stock options (in shares) |  | 60,000 |  |  |  | 60,000
Stock issued during the period | $ 7,767 |  |  |  | $ 7,767 |
Stock issued during the period (in shares) | 6,298,000 |  |  |  |  |
Shares issued for debt refinancing |  | $ 1,875 |  |  |  | $ 1,875
Shares issued for debt refinancing (in shares) |  | 2,092,000 |  |  |  |
Shares issued for acquisition of mineral property interests |  | $ 70 |  |  |  | 70
Shares issued for acquisition of mineral property interests (in shares) |  | 53,000 |  |  |  |
Net loss |  |  | (128,783) |  |  | (128,783)
Balance at Sep. 30, 2020 |  | $ 1,540,807 | (1,160,006) |  |  | 380,801
Balance (in shares) at Sep. 30, 2020 |  | 408,842,000 |  |  |  |
Balance at Jun. 30, 2020 |  | $ 1,532,940 | (1,150,228) |  |  | 382,712
Balance (in shares) at Jun. 30, 2020 |  | 402,491,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 30 |  |  |  | 30
Shares issued for debt refinancing |  | $ 7,767 |  |  |  | 7,767
Shares issued for debt refinancing (in shares) |  | 6,298,000 |  |  |  |
Shares issued for acquisition of mineral property interests |  | $ 70 |  |  |  | 70
Shares issued for acquisition of mineral property interests (in shares) |  | 53,000 |  |  |  |
Net loss |  |  | (9,778) |  |  | (9,778)
Balance at Sep. 30, 2020 |  | $ 1,540,807 | (1,160,006) |  |  | 380,801
Balance (in shares) at Sep. 30, 2020 |  | 408,842,000 |  |  |  |
Balance at Dec. 31, 2020 |  | $ 1,548,876 | (1,183,548) |  |  | 365,328
Balance (in shares) at Dec. 31, 2020 |  | 416,587,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 732 |  |  |  | 732
Issuance of equity by subsidiary (Note 18) |  | 25,086 |  | $ 14,914 |  | $ 40,000
Exercise of stock options (in shares) |  |  |  |  |  | 0
Stock issued during the period | $ 10,785 | $ 29,875 |  |  | $ 10,785 | $ 29,875
Stock issued during the period (in shares) | 12,601,000 | 30,000,000 |  |  |  |
Net loss |  |  | (35,856) |  |  | (35,856)
Balance at Sep. 30, 2021 |  | $ 1,615,355 | (1,219,404) | 14,914 |  | 410,865
Balance (in shares) at Sep. 30, 2021 |  | 459,188,000 |  |  |  |
Balance at Jun. 30, 2021 |  | $ 1,589,975 | (1,202,003) |  |  | 387,972
Balance (in shares) at Jun. 30, 2021 |  | 459,188,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 294 |  |  |  | 294
Issuance of equity by subsidiary (Note 18) |  | 25,086 |  | 14,914 |  | 40,000
Net loss |  |  | (17,401) |  |  | (17,401)
Balance at Sep. 30, 2021 |  | $ 1,615,355 | $ (1,219,404) | $ 14,914 |  | 410,865
Balance (in shares) at Sep. 30, 2021 |  | 459,188,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Non-controlling interests (Note 18) |  |  |  |  |  | $ 14,914

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