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Inventories (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Of Inventories Explanatory [Abstract]  
Inventories
    
December 31,
 
2020
 
   
 
December 31,
 
2019
 
 
   
Ore stockpile
  
$
 9,203
 
  $ 8,592 
   
Rough diamonds
  
 
48,036
    70,190 
   
Supplies inventory
  
 
33,267
    32,990 
   
Total
  
$
                                 90,506
 
  $                                  111,772