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Income and mining taxes - Income tax recovery (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
INCOME AND MINING TAXES [Abstract] |  |
Loss before taxes | $ (59.2) | $ (65.4)
Canadian federal and provincial income tax rates | 25.60% | 25.80%
Income tax recovery based on above rates | $ (14.8) | $ (16.9)
INCREASE (DECREASE) DUE TO |  |
Permanent differences | (2.1) | 4.6
Different statutory tax rates on earnings of foreign subsidiaries | (0.1) | 0.2
Foreign exchange on non-monetary assets and liabilities | 0.9 | (1.6)
Other foreign exchange differences | (7.8) | 20.8
Canadian mining tax | 5.3 | (1.2)
Change in unrecognized deferred tax assets | 23.9 | (7.1)
Other | 0.0 | 2.6
Total income tax expense | $ 5.3 | $ 1.4

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