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Income tax and deferred taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]    
Current tax assets, current $ 91,433 $ 57,110
Current tax assets, non-current 32,179 32,179
Monthly provisional income tax payments, Chilean companies [Member]    
Statement [Line Items]    
Current tax assets, current 47,283 21,172
Current tax assets, non-current 6,398 6,398
Monthly provisional income tax payments, foreign companies [Member]    
Statement [Line Items]    
Current tax assets, current 124 5,199
Corporate tax credits [Member]    
Statement [Line Items]    
Current tax assets, current [1] 1,262 1,858
1st category tax absorbed by tax loss [Member]    
Statement [Line Items]    
Current tax assets, current [2] 916  
Taxes in recovery process [Member]    
Statement [Line Items]    
Current tax assets, current 41,848 28,881
Specific tax on mining activities paid (on consignment) [Member]    
Statement [Line Items]    
Current tax assets, non-current $ 25,781 $ 25,781
[1] These credits are available for Companies and are related to corporate tax payments in April of the following year. These credits include, among others, credits for training expenses (SENCE), credits for acquisition of fixed assets, donations and credits in Chile for taxes paid abroad.
[2] This concept corresponds to the absorption of the tax losses determined by the company at the end of the year, which must be attributed to the dividends received during the year.