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Income tax and deferred taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Deferred tax assets $ 161,340 $ 138,230  
Deferred Tax Liabilities, Net (317,441) (321,641)  
Deferred tax liability (asset) (156,101) (183,411) $ (175,361)
Unrealized loss [Member]      
Statement [Line Items]      
Deferred tax assets 90,585 82,075  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 90,585 82,075 75,832
Property, plant and equipment and capitalized interest [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (187,168) (197,167)  
Deferred tax liability (asset) (187,168) (197,167) (196,843)
Restoration and rehabilitation provision [Member]      
Statement [Line Items]      
Deferred tax assets 6,598 7,313  
Deferred Tax Liabilities, Net 0 0  
Manufacturing expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (107,215) (106,420)  
Deferred tax liability (asset) (107,215) (106,420) (103,760)
Staff severance indemnities, unemployment insurance [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (6,669) (6,000)  
Deferred tax liability (asset) (6,669) (6,000) (5,679)
Vacation accrual [Member]      
Statement [Line Items]      
Deferred tax assets 6,138 5,591  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 6,138 5,591 5,155
Inventory provision [Member]      
Statement [Line Items]      
Deferred tax assets 22,200 23,885  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 22,200 23,885 28,155
Materials provision [Member]      
Statement [Line Items]      
Deferred tax assets 8,812 7,982  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 8,812 7,982 6,239
Forwards [Member]      
Statement [Line Items]      
Deferred tax assets 0    
Deferred Tax Liabilities, Net 0    
Deferred tax liability (asset) 0 0 2,169
Employee benefits [Member]      
Statement [Line Items]      
Deferred tax assets 0 2,689  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 0 2,689 3,309
Research and development expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,580) (3,533)  
Deferred tax liability (asset) (3,580) (3,533) (2,216)
bad debt provision [Member]      
Statement [Line Items]      
Deferred tax assets 5,072 3,542  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 5,072 3,542 4,188
Provision for legal complaints and expenses [Member]      
Statement [Line Items]      
Deferred tax assets 19,637 2,546  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 19,637 2,546 4,013
Loan approval expenses [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (5,212) (3,856)  
Deferred tax liability (asset) (5,212) (3,856) (2,337)
Junior mining companies valued based on stock price [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,929) (1,287)  
Deferred tax liability (asset) (3,929) (1,287) (976)
Royality [Member]      
Statement [Line Items]      
Deferred tax assets 0 0  
Deferred Tax Liabilities, Net (3,014) (1,357)  
Deferred tax liability (asset) (3,014) (1,357) (3,278)
Tax loss benefit [Member]      
Statement [Line Items]      
Deferred tax assets 844 2,296  
Deferred Tax Liabilities, Net 0 0  
Deferred tax liability (asset) 844 2,296 1,124
Other deferred tax assets [Member]      
Statement [Line Items]      
Deferred tax assets 1,454 0  
Deferred Tax Liabilities, Net 0 (2,021)  
Deferred tax liability (asset) 1,454 (2,021) 5,005
Foreign items other [Member]      
Statement [Line Items]      
Deferred tax assets 0 311  
Deferred Tax Liabilities, Net (654) 0  
Deferred tax liability (asset) $ (654) $ 311 $ 259