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Inventories (Tables)
3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories are summarized as follows:
 MARCH 31
2024
 DECEMBER 31
2023
Coal$19,576 $23,784 
Mining supplies56,179 53,216 
 Total inventories$75,755  $77,000