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Inventories
9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are summarized as follows:
 SEPTEMBER 30
2024
 DECEMBER 31
2023
Coal and aggregates$32,779 $23,784 
Mining supplies61,657 53,216 
 Total inventories$94,436  $77,000 

During the three and nine months ended September 30, 2024, the Company recorded a $1.0 million and $4.1 million inventory impairment charge, respectively. During the three and nine months ended September 30, 2023, the Company recorded a $2.4 million and $6.6 million inventory impairment charge, respectively. The inventory impairment charges are included in the line “Cost of sales” in the accompanying Unaudited Condensed Consolidated Statements of Operations as the cost-basis of coal inventory exceeded its net realizable value at MLMC.