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Property, plant, equipment and development costs - Distribution Of Depreciation Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense $ 173,239 $ 178,294 $ 199,586
Cost of sales of goods      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 147,032 159,652 174,103
Unabsorbed cost due to production stoppage      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 14,877 4,569 10,764
Cost of sales of services      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 8,153 8,109 8,461
Administrative expensess.      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 1,886 4,741 3,142
Property, plant, equipment and development costs      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 1,039 963 833
Exploration in non-operating areas      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 101 114 111
Selling expenses      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 93 84 0
Other, net      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense 49 48 46
Discontinued operations, note 1(e)      
Disclosure of attribution of expenses by nature to their function [line items]      
Total depreciation expense $ 9 $ 14 $ 2,126