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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
ATM offering
Common Stock and Additional Paid-in Capital
Accumulated Deficit
Flow-through common shares
ATM offering
Total
Balance at Dec. 31, 2017     $ 1,447,879 $ (926,606)     $ 521,273
Balance (in shares) at Dec. 31, 2017     337,051,000        
Increase (Decrease) in Shareholders' Equity              
Stock-based compensation     $ 269       269
Exercise of stock options     $ 192       $ 192
Exercise of stock options (in shares)     182,000       171,000
Shareholder distributions     $ (3,372)       $ (3,372)
Stock issued during the period $ 11,145   $ 918   $ 11,145   918
Stock issued during the period (in shares) 6,634,000   515,000        
Shares issued for acquisition of mineral property interests     $ 391       391
Shares issued for acquisition of mineral property interests (in shares)     178,000        
Net loss       (44,870)     (44,870)
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     $ 694       694
Exercise of stock options     $ 544       $ 544
Exercise of stock options (in shares)     535,000       535,000
Units Issued for cash, net of share issue costs     $ 69,467       $ 69,467
Units Issued for cash, net of share issue costs (in shares)     53,880,000        
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       353,570
Net loss       (59,747)     $ (59,747)
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     $ 613       613
Shares issued in connection with acquisitions     $ 70       70
Shares issued in connection with acquisitions (in shares)     53,000        
Exercise of stock options     $ 138       $ 138
Exercise of stock options (in shares)     135,000       135,000
Stock issued during the period $ 15,478       $ 15,478    
Stock issued during the period (in shares) 13,968,000            
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 (in shares)             53,600
Net loss       (152,325)     $ (152,325)
Balance at Dec. 31, 2020     $ 1,548,876 $ (1,183,548)     $ 365,328
Balance (in shares) at Dec. 31, 2020     416,587,000