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Inventories, net (Tables)
6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories, net
Inventories, net consisted of the following: 
 June 30, 2023December 31, 2022
Raw coal$48,289 $57,382 
Saleable coal155,788 91,474 
Materials, supplies and other, net
66,384 51,718 
Total inventories, net$270,461 $200,574