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Trade and other receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Trade and other receivables [abstract]    
Trade receivables $ 10.2 $ 4.4
Sales tax receivable 5.8 11.0
Unsettled provisionally priced concentrate derivatives and swap contracts (0.3) (1.8)
Other 0.6 0.5
Total trade and other receivables $ 16.3 $ 14.1