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Contractual obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Contractual Obligations    
Balance at the beginning of the year $ 117,112 $ 132,160
Revenues recognition upon ore delivery (43,662) (30,498)
Remeasurement adjustment 21,084 10,121
Accretion for the year 6,424 5,329
Balance at the end of year 100,958 117,112
Current 31,686 37,432
Non-current $ 69,272 $ 79,680