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INVENTORIES (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory components consist of the following:
 
September 30,
2018
 
December 31,
2017
Coal
$
9,572

 
$
11,411

Supplies
42,898

 
42,009

Total Inventories
$
52,470

 
$
53,420