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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