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Note 8 - Production Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of components for cost of sales [text block]
    2017     2016     2015  
                   
Salaries and wages    
13,440
      
12,206
      
11,908
  
Cash-settled share-based payments (note 23.2)    
311
      
-
      
-
  
Consumable materials    
18,617
      
16,291
      
14,479
  
Site restoration    
58
      
32
      
-
  
Pre-feasibility exploration cost    
410
      
408
      
380
  
Safety    
323
      
221
      
551
  
On mine administration    
3,004
      
2,898
      
2,701
  
Other production cost    
17
      
30
      
-
  
Total    
36,180
      
32,086
      
30,019