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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory Components

Inventory components consist of the following:
 
December 31,
 
2019
 
2018
Coal
$
2,484

 
$
4,642

Supplies
51,647

 
44,004

Total Inventories
$
54,131

 
$
48,646