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Note 9 - Production Costs (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of components for cost of sales [text block]
    2019   2018   2017
             
Salaries and wages    
13,905
      
13,160
      
13,440
  
Cash-settled share-based payments (note 27.1(a))    
107
      
43
      
311
  
Consumable materials    
13,020
      
12,143
      
9,916
  
Electricity costs    
6,383
      
9,313
      
8,701
  
Site restoration    
-
      
84
      
58
  
Pre-feasibility exploration cost    
301
      
411
      
410
  
Safety    
525
      
592
      
323
  
On mine administration    
2,159
      
3,569
      
3,004
  
Other production cost    
-
      
-
      
17
  
     
36,400
      
39,315
      
36,180