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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) | Common Shares and Additional Paid-in Capital Flow-through common shares | Common Shares and Additional Paid-in Capital | Accumulated Deficit | Noncontrolling Interest | Flow-through common shares | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  | $ 1,457,422,000 | $ (971,476,000) |  |  | $ 485,946,000
Balance (in shares) at Dec. 31, 2018 |  | 344,560,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 694,000 |  |  |  | 694,000
Exercise of stock options |  | $ 544,000 |  |  |  | $ 544,000
Exercise of stock options (in shares) |  | 535,000 |  |  |  | 535,000
Units Issued for cash, net of share issue costs |  | $ 69,467,000 |  |  |  | $ 69,467,000
Units Issued for cash, net of share issue costs (in shares) |  | 53,880,000 |  |  |  |
Stock issued during the period |  | $ 1,851,000 |  |  |  | 1,851,000
Stock issued during the period (in shares) |  | 1,010,000 |  |  |  |
Shares issued for acquisition of mineral property interests |  | $ 724,000 |  |  |  | 724,000
Shares issued for acquisition of mineral property interests (in shares) |  | 354,000 |  |  |  |
Net loss |  |  | (59,747,000) |  |  | (59,747,000)
Balance at Dec. 31, 2019 |  | $ 1,530,702,000 | (1,031,223,000) |  |  | 499,479,000
Balance (in shares) at Dec. 31, 2019 |  | 400,339,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 613,000 |  |  |  | 613,000
Exercise of stock options |  | $ 138,000 |  |  |  | $ 138,000
Exercise of stock options (in shares) |  | 135,000 |  |  |  | 135,000
Stock issued during the period | $ 15,478,000 |  |  |  | $ 15,478,000 |
Stock issued during the period (in shares) | 13,968,000 |  |  |  |  |
Shares issued for debt refinancing |  | $ (1,875,000) |  |  |  | $ (1,875,000)
Shares issued for debt refinancing (in shares) |  | 2,092,000 |  |  |  |
Shares issued for acquisition of mineral property interests |  | $ 70,000 |  |  |  | 70,000
Shares issued for acquisition of mineral property interests (in shares) |  | 53,000 |  |  |  |
Net loss |  |  | (152,325,000) |  |  | (152,325,000)
Balance at Dec. 31, 2020 |  | $ 1,548,876,000 | (1,183,548,000) |  |  | 365,328,000
Balance (in shares) at Dec. 31, 2020 |  | 416,587,000 |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |
Stock-based compensation |  | $ 837,000 |  |  |  | 837,000
Units Issued for cash, net of share issue costs |  | $ 29,875,000 |  |  |  | 29,875,000
Units Issued for cash, net of share issue costs (in shares) |  | 30,000,000 |  |  |  |
Stock issued during the period | $ 10,785,000 |  |  |  | $ 10,785,000 |
Stock issued during the period (in shares) | 12,601,000 |  |  |  |  |
Issuance of equity by subsidiary (Note 20) |  | $ 25,223,000 |  | $ 14,605,000 |  | 39,828,000
Net loss |  |  | (56,884,000) | 172,000 |  | (56,712,000)
Balance at Dec. 31, 2021 |  | $ 1,615,596,000 | $ (1,240,432,000) | $ 14,777,000 |  | $ 389,941,000
Balance (in shares) at Dec. 31, 2021 |  | 459,188,000 |  |  |  |

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