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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock and Additional Paid-in Capital Flow-through common shares | Common Stock and Additional Paid-in Capital Registered direct offering | Common Stock and Additional Paid-in Capital ATM offering | Common Stock and Additional Paid-in Capital | Accumulated Deficit | Flow-through common shares | Registered direct offering | ATM offering | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  |  |  | $ 1,457,422 | $ (971,476) |  |  |  | $ 485,946
Balance (in shares) at Dec. 31, 2018 |  |  |  | 344,560,000 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 481 |  |  |  |  | 481
Exercise of stock options |  |  |  | $ 411 |  |  |  |  | $ 411
Exercise of stock options (in shares) |  |  |  | 405,000 |  |  |  |  | 405,000
Units issued in connection with registered direct offering , net of issuance costs |  | $ 22,910 |  |  |  |  | $ 22,910 |  |
Units issued in connection with registered direct offering , net of issuance costs (in shares) |  | 16,129,000 |  |  |  |  |  |  |
Stock issued during the period |  |  | $ 1,851 |  |  |  |  | $ 1,851 |
Stock issued during the period (in shares) |  |  | 1,010,000 |  |  |  |  |  |
Shares issued for acquisition of mineral property interests |  |  |  | $ 724 |  |  |  |  | $ 724
Shares issued for acquisition of mineral property interests (in shares) |  |  |  | 354,000 |  |  |  |  |
Net loss |  |  |  |  | (34,615) |  |  |  | (34,615)
Balance at Sep. 30, 2019 |  |  |  | $ 1,483,799 | (1,006,091) |  |  |  | 477,708
Balance (in shares) at Sep. 30, 2019 |  |  |  | 362,458,000 |  |  |  |  |
Balance at Jun. 30, 2019 |  |  |  | $ 1,482,640 | (994,626) |  |  |  | 488,014
Balance (in shares) at Jun. 30, 2019 |  |  |  | 361,957,000 |  |  |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 284 |  |  |  |  | 284
Exercise of stock options |  |  |  | $ 151 |  |  |  |  | 151
Exercise of stock options (in shares) |  |  |  | 147,000 |  |  |  |  |
Shares issued for acquisition of mineral property interests |  |  |  | $ 724 |  |  |  |  | 724
Shares issued for acquisition of mineral property interests (in shares) |  |  |  | 354,000 |  |  |  |  |
Net loss |  |  |  |  | (11,465) |  |  |  | (11,465)
Balance at Sep. 30, 2019 |  |  |  | $ 1,483,799 | (1,006,091) |  |  |  | 477,708
Balance (in shares) at Sep. 30, 2019 |  |  |  | 362,458,000 |  |  |  |  |
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
Stock issued during the period | $ 7,767 |  |  |  |  | $ 7,767 |  |  |
Stock issued during the period (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 |  |  |  |  | 53,600
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 |  |  |  |  |

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