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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Statement of Cash Flows [Abstract]      
Net income (loss) for the period $ 114,264 $ (14,730)  
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depletion, depreciation and amortization 655 813  
Share-based compensation 1,186 862  
Accretion of asset retirement obligations 346 394 $ 1,556
Revision and settlement of asset retirement obligation 0 96 (238)
Unrealized foreign exchange (gain) loss (24) 1,225  
Unrealized loss on investments accounted for at fair value 2,959 3,418  
Gain on sale of assets (116,450) 0  
Other non-cash income, net 149 42  
Changes in current assets and liabilities:      
Marketable securities (325) (111)  
Inventories 538 784  
Trade and other receivables (1,540) (1,332)  
Prepaid expenses and other current assets (1,233) (886)  
Accounts payable and accrued liabilities (3,104) (1,123)  
Net cash used in operating activities (2,579) (10,548)  
INVESTING ACTIVITIES      
Additions to property, plant and equipment (2,042) (398)  
Additions to mineral properties (1,171) 0  
Acquisition of mineral properties (21,624) 0  
Purchases of marketable securities (47,924) 0  
Proceeds from sale of property, plant and equipment, net 53,759 0  
Net cash used in investing activities (19,002) (398)  
FINANCING ACTIVITIES      
Issuance of common shares for cash, net of issuance costs 0 4,164  
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (918) (892)  
Cash received from exercise of stock options 72 318  
Net cash provided by (used in) financing activities (846) 3,590  
Effect of exchange rate fluctuations on cash held in foreign currencies 22 19  
Plus: release of restricted cash related to sale of assets 3,475 0  
Net change in cash, cash equivalents and restricted cash (18,930) (7,337)  
Cash, cash equivalents and restricted cash, beginning of period 80,269 132,822 132,822
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 61,339 125,485 $ 80,269
Non-cash investing and financing transactions:      
Issuance of common shares for consulting services 0 193  
Supplemental disclosure of cash flow information:      
Interest 11 9  
Increase (decrease) in accrued capital expenditures and accounts payable for property, plant and equipment and mineral properties $ 1,456 $ (182)