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Income tax and deferred taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]      
Deferred tax assets $ 604,471 $ 135,904  
Deferred tax liabilities (289,825) (246,320)  
Total 314,646 (110,416) $ (156,101)
Unrealized loss      
Statement [Line Items]      
Deferred tax assets 655,695 144,181  
Deferred tax liabilities   0  
Total 655,695 144,181 90,585
Property, plant and equipment and capitalized interest      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (244,560) (189,073)  
Total (244,560) (189,073) (187,168)
Restoration and rehabilitation provision      
Statement [Line Items]      
Deferred tax assets 4,685 6,567  
Deferred tax liabilities 0 0  
Total 4,685 6,567  
Manufacturing expenses      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (139,383) (108,181)  
Total (139,383) (108,181) (107,215)
Employee benefits and unemployment insurance      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (8,995) (7,485)  
Total (8,995) (7,486) (6,669)
Vacation accrual      
Statement [Line Items]      
Deferred tax assets 7,650 6,039  
Deferred tax liabilities 0 0  
Total 7,650 6,039 6,138
Inventory provision      
Statement [Line Items]      
Deferred tax assets 27,512 20,557  
Deferred tax liabilities 0 0  
Total 27,512 20,557 22,200
Materials provision      
Statement [Line Items]      
Deferred tax assets 11,915 10,554  
Deferred tax liabilities 0 0  
Total 11,915 10,554 8,812
Others employee benefits      
Statement [Line Items]      
Deferred tax assets 1,177 929  
Deferred tax liabilities 0 0  
Research and development expenses      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred tax liabilities (12,294) (5,387)  
Total (12,294) (5,387) (3,581)
Bad debt provision      
Statement [Line Items]      
Deferred tax assets 715 2,708  
Deferred tax liabilities 0 0  
Total 715 2,708 5,072
Provision for legal complaints and expenses      
Statement [Line Items]      
Deferred tax assets 6,827 334  
Deferred tax liabilities 0 0  
Total 6,827 334 19,637
Loan approval expenses      
Statement [Line Items]      
Deferred tax assets 0    
Deferred tax liabilities (8,793)    
Total (8,793) (8,967) (5,212)
Junior mining companies valued based on stock price      
Statement [Line Items]      
Deferred tax assets 5,226    
Deferred tax liabilities 0    
Total 5,226 5,243 (3,929)
Royality      
Statement [Line Items]      
Deferred tax assets 0    
Deferred tax liabilities (5,799)    
Total (5,799) (4,545) (3,012)
Loan acquisition expenses      
Statement [Line Items]      
Deferred tax assets   0  
Deferred tax liabilities   (8,967)  
Financial instruments recorded at market value      
Statement [Line Items]      
Deferred tax assets   5,242  
Deferred tax liabilities   0  
Specific tax on mining activity      
Statement [Line Items]      
Deferred tax assets   0  
Deferred tax liabilities   (4,545)  
Tax loss benefit      
Statement [Line Items]      
Deferred tax assets 10,059 7,113  
Deferred tax liabilities 0 0  
Total 8,615 7,113 844
Other      
Statement [Line Items]      
Deferred tax assets 2,913 8,862  
Deferred tax liabilities 0 0  
Total 16,049 8,862 1,454
Foreign items (other)      
Statement [Line Items]      
Deferred tax assets 96 136  
Deferred tax liabilities 0    
Total (11,596) 136 $ (654)
Balances to date      
Statement [Line Items]      
Deferred tax assets 734,470 213,222  
Deferred tax liabilities $ (419,824) $ (323,638)