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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
OPERATING ACTIVITIES      
Net income (loss) for the period $ (59,944) $ 1,448 $ (27,872)
Items not involving cash:      
Depletion, depreciation and amortization 3,269 3,189 2,701
Share-based compensation 4,641 2,158 2,598
Gain on disposal of non-core assets (366) (35,733) 0
Change in value of Convertible Debentures 0 0 (156)
Change in value of warrant liabilities 0 8,078 5,436
Accretion of asset retirement obligation 1,556 1,284 1,911
Unrealized foreign exchange (gain) loss (2,080) 129 (1,045)
Revision and settlement of asset retirement obligation (238) (369) (7,845)
Impairment of inventories 0 0 1,644
Change in investments accounted for at fair value 16,808 (6,311) (1,729)
Other non-cash expenses (income) 601 (582) 1,022
Changes in assets and liabilities      
Inventories (8,571) (3,219) (6,100)
Trade and other receivables 1,837 (1,249) 192
Prepaid expenses and other current assets (8,886) (257) 149
Accounts payable and accrued liabilities 1,671 2,140 (3,084)
Deposits for assets held for sale 6,000 0 0
Net cash used in operating activities (49,702) (29,294) (32,178)
INVESTING ACTIVITIES      
Purchase of property, plant and equipment (1,996) (1,368) (627)
Purchases of marketable securities (11,435) 0 0
Maturities and sales of marketable securities 0 2,554 4,208
Proceeds from disposal of non-core assets 0 2,000 0
Disposal On Mineral Properties, Investing Activities 366 0 0
Net cash provided by (used in) investing activities (7,065) 3,186 3,581
FINANCING ACTIVITIES      
Issuance of common shares for cash, net of issuance costs 7,886 106,208 52,390
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (884) (538) (415)
Cash received from exercise of stock options 753 2,375 491
Cash received from exercise of warrants 0 9,840 0
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights (11) (256) 0
Repayment of loans and borrowings 0 0 (16,015)
Cash received from non-controlling interest 126 311 133
Net cash provided by financing activities 7,870 117,940 36,584
Effect of exchange rate fluctuations on cash held in foreign currencies (66) 5 107
Less: restricted cash - held for sale 3,590 0 0
Net change in cash, cash equivalents and restricted cash (52,553) 91,837 8,094
Cash, cash equivalents and restricted cash, beginning of period 132,822 40,985 32,891
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 80,269 132,822 40,985
Non-cash investing and financing transactions:      
Issuance of common shares for consulting services 205 242 188
Interest 25 54 952
Increase (decrease) in accrued capital expenditures and accounts payable for property, plant and equipment $ (161) $ 182 $ 0