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Note 13 - Other Expenses (Tables)
12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Disclosure of other operating expenses components [text block]
    2020     2019     2018  
                   
Intermediated Money Transaction Tax    
451
     
354
     
116
 
Solar evaluation cost*    
230
     
160
     
 
COVID-19 donations
~
   
1,322
     
     
 
Community and social responsibility cost    
382
     
     
 
Other    
     
8
     
12
 
Impairment of property, plant and equipment    
     
144
     
208
 
Impairment of exploration and evaluation assets (note 21.1)    
2,930
     
     
 
     
5,315
     
666
     
336