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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Operating activities    
Net loss $ (44,563) $ (48,164)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depletion, depreciation and amortization 3,095 2,611
Share-based compensation 7,152 5,490
Accretion of asset retirement obligations 4,308 1,935
Settlement of asset retirement obligations (2,972) (14,187)
Foreign exchange loss 1,383 1,516
Loss in unconsolidated affiliates 2,391 421
Realized gain on marketable securities (1,149) (450)
Gain on sale of assets (361) (3,490)
Amortization of debt issuance costs and other, net 1,976 415
Changes in current assets and liabilities:    
Marketable securities 5,180 328
Inventories 1,315 (7,184)
Trade and other receivables 2,950 29,965
Prepaid expenses and other current assets (694) (203)
Accounts payable, accrued liabilities and other current liabilities 2,239 (13,776)
Net cash used in operating activities (17,750) (44,773)
Investing activities    
Additions to property, plant and equipment (6,771) (5,990)
Additions to mineral properties (17,287) (11,893)
Purchases of marketable securities (265,908) (138,945)
Proceeds from sales and maturities of marketable securities 165,980 84,995
Contributions to investments (9,698) (6,874)
Proceeds from sale of assets 361 3,490
Net cash used in investing activities (133,323) (75,217)
Financing activities    
Issuance of common shares for cash, net of issuance costs 153,075 151,879
Deferred financing costs paid (3,993) 0
Cash received from exercise of stock options 2,704 157
Cash received from non-controlling interest 404 759
Net cash provided by financing activities 144,185 152,131
Effect of exchange rate fluctuations on cash held in foreign currencies 946 1,098
Net change in cash, cash equivalents and restricted cash (5,942) 33,239
Cash, cash equivalents and restricted cash, beginning of period 87,204 58,605
Cash, cash equivalents and restricted cash, end of period 81,262 91,844
Supplemental disclosure of cash flow information:    
Cash paid for taxes 69 109
Cash paid for interest 2,687 108
Increase in accrued capital expenditures and accounts payable for property, plant and equipment and mineral properties 521 2,710
Restricted Stock Units (RSUs)    
Financing activities    
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (7,334) (664)
Stock Appreciation Rights (SARs)    
Financing activities    
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units $ (671) $ 0