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Income tax and deferred taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Major Components Of Tax Expense [Line Items]      
Deferred tax assets $ 157,564 $ 302,236  
Deferred tax liabilities (298,379) (394,688)  
Total (140,815) (92,452) $ 314,646
Unrealized profit      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 157,503 321,340  
Deferred tax liabilities 0 0  
Total 157,503 321,340 655,695
Property, plant and equipment and capitalized interest      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (314,309) (240,056)  
Total (314,309) (288,116) (244,560)
Restoration and rehabilitation provision      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 5,220 6,336  
Deferred tax liabilities 0 0  
Total 5,220 6,336  
Manufacturing expenses      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (154,906) (159,879)  
Total (154,906) (159,879) (139,383)
Employee benefits and unemployment insurance      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (8,736) (9,438)  
Total (8,736) (9,438) (8,995)
Vacation accrual      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 9,001 9,373  
Deferred tax liabilities 0 0  
Total 9,001 9,373 7,650
Inventory provision      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 16,353 34,718  
Deferred tax liabilities 0 0  
Total 16,353 34,718 27,512
Materials provision      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 20,293 14,405  
Deferred tax liabilities 0 0  
Total 20,293 14,405 11,915
Others employee benefits      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 10,291 6,561  
Deferred tax liabilities 0 0  
Research and development expenses      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (17,239) (16,046)  
Total (17,239) (16,046) (12,294)
Bad debt provision      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 3,060  
Deferred tax liabilities (203) 0  
Total (203) 1,957 715
Provision for legal complaints and expenses      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 2,788 2,932  
Deferred tax liabilities 0 0  
Total 2,788 2,932 6,827
Loan acquisition expenses      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (17,604) (12,735)  
Financial instruments recorded at market value      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 3,277 0  
Deferred tax liabilities 0 (52,016)  
Total 3,277 (52,016) 5,226
Specific tax on mining activity      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (1,398) (3,303)  
Total (1,398) (3,303) (5,799)
Specific tax on lithium mining activity      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 4,049    
Deferred tax liabilities 0    
Total 4,049 0  
Tax loss benefit      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 129,123 23,340  
Deferred tax liabilities 0 0  
Total 129,123 74,347 10,059
Other      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 15,422 0  
Deferred tax liabilities 0 (21,119)  
Total 15,422 (22,963) 2,913
Foreign items (other)      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 260 75  
Deferred tax liabilities 0 0  
Total 260 75 $ 96
Balances to date      
Major Components Of Tax Expense [Line Items]      
Deferred tax assets 373,580 422,140  
Deferred tax liabilities $ (514,395) $ (514,592)