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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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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

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