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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
OPERATING ACTIVITIES      
Net income (loss) for the period $ 99,756 $ (59,944) $ 1,448
Items not involving cash:      
Depletion, depreciation and amortization 2,751 3,269 3,189
Share-based compensation 4,625 4,641 2,158
Gain on sale of assets (119,257) (366) (35,733)
Realized gain on convertible note redemptions and sale (1,430) 0 0
Change in value of warrant liabilities 0 0 8,078
Accretion of asset retirement obligations 1,192 1,556 1,284
Unrealized foreign exchange (gain) loss (431) (2,080) 129
Unrealized (gain) loss on investments (15,472) 16,808 (6,311)
Realized loss on investments 10,491 0 0
Realized gain on marketable securities (1,141) 0 0
Other, net 84 (93) (156)
Changes in current assets and liabilities      
Marketable securities 530 456 (795)
Inventories (100) (8,571) (3,219)
Trade and other receivables (237) 1,837 (1,249)
Prepaid expenses and other current assets 423 (8,886) (257)
Accounts payable and accrued liabilities 2,807 1,671 2,140
Net cash used in operating activities (15,409) (49,702) (29,294)
INVESTING ACTIVITIES      
Additions to property, plant and equipment (15,437) (1,996) (1,368)
Additions to mineral properties (6,782) 0 0
Acquisition of mineral properties (22,491) 0 0
Purchases of marketable securities (174,622) (11,435) 0
Maturities of marketable securities 79,041 0 2,554
Purchase of investments without a readily determinable fair value (1,324) 0 0
Deposits for assets held for sale 0 6,000 0
Proceeds from sale of assets 56,875 366 2,000
Proceeds from convertible note redemptions and sale, net 60,887 0 0
Net cash provided by (used in) investing activities (23,853) (7,065) 3,186
FINANCING ACTIVITIES      
Issuance of common shares for cash, net of issuance costs 31,813 7,886 106,208
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (918) (884) (538)
Cash received from exercise of stock options 970 753 2,375
Cash received from exercise of warrants 0 0 9,840
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights (1,533) (11) (256)
Cash received from non-controlling interest 83 126 311
Net cash provided by financing activities 30,415 7,870 117,940
Effect of exchange rate fluctuations on cash held in foreign currencies 12 (66) 5
Less: restricted cash related to assets held for sale 0 3,590 0
Plus: release of restricted cash related to sale of assets 3,590 0 0
Net change in cash, cash equivalents and restricted cash (5,245) (52,553) 91,837
Cash, cash equivalents and restricted cash, beginning of period 80,269 132,822 40,985
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 75,024 80,269 132,822
Non-cash investing and financing transactions:      
Cash paid during the period for interest 186 25 54
Increase (decrease) in accrued capital expenditures and accounts payable for property, plant and equipment 701 (161) 182
Issuance of common shares for consulting services 0 205 242
Acquisition of convertible note $ 59,457 $ 0 $ 0