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Inventories - Summary of inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Classes of current inventories [abstract]    
Ore stockpiles $ 10,910 $ 9,856
In-process inventory and finished goods 141,975 102,884
Materials and supplies 126,110 123,150
Inventories $ 278,995 $ 235,890