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Inventories
6 Months Ended
Jun. 30, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are summarized as follows:
 JUNE 30
2023
 DECEMBER 31
2022
Coal$17,555 $27,927 
Mining supplies47,655 43,561 
 Total inventories$65,210  $71,488 

During the three and six months ended June 30, 2023, the Company recorded a $1.8 million and $4.2 million inventory impairment charge, respectively, in the line “Cost of sales” in the accompanying Unaudited Consolidated Statements of Operations as mining costs exceeded net realizable value at MLMC.