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INVENTORIES
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
INVENTORIES
INVENTORIES:
Inventory components consist of the following:
 
March 31,
2019
 
December 31,
2018
Coal
$
8,853

 
$
4,642

Supplies
46,035

 
44,004

Total Inventories
$
54,888

 
$
48,646



Inventories are stated at the lower of cost or net realizable value. The cost of coal inventories is determined by the first-in, first-out (“FIFO”) method. Coal inventory costs include labor, supplies, equipment costs, operating overhead, depreciation, depletion, amortization and other related costs. The cost of supplies inventory is determined by the average cost method and includes operating and maintenance supplies to be used in the Company's coal operations.