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Inventories
12 Months Ended
Dec. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are summarized as follows:
 December 31
 20242023
Coal$27,076 $23,784 
Mining supplies67,532 53,216 
Total inventories$94,608 $77,000 

The weighted average method is used for inventory valuation. During the year ended December 31, 2024 and 2023, we recorded $9.6 million and $7.5 million of inventory impairment charges, respectively, in the line Cost of sales in the accompanying Consolidated Statements of Operations as mining costs exceeded net realizable value of coal inventory at MLMC.