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INVENTORIES | 6 Months Ended
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Jun. 30, 2024
INVENTORIES |
INVENTORIES | 5.INVENTORIES ​ Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, | ​ | December 31, | ​
​ | ​ | 2024 |  | 2023 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal | ​ | $ | 118,171 | ​ | $ | 56,549 | ​
Finished goods (net of reserve for obsolescence of $784 and $728, respectively) | ​ | ​ | 4,109 | ​ | ​ | 3,908 | ​
Work in process | ​ | ​ | 708 | ​ | ​ | 791 | ​
Raw materials | ​ | ​ | 2,107 | ​ | ​ | 2,144 | ​
​ | ​ | ​ | 125,095 | ​ | ​ | 63,392 | ​
Supplies (net of reserve for obsolescence of $7,758 and $7,439, respectively) | ​ |  | 71,130 | ​ |  | 64,164 | ​
Total inventories, net | ​ | $ | 196,225 | ​ | $ | 127,556 | ​
​ During the six months ended June 30, 2024, we recorded lower of cost or net realizable value adjustments of $16.9 million to our coal inventories. These adjustments are a result of lower coal sale prices and higher cost per ton primarily due to lower production at the Mettiki mining complex and ongoing development activities at the Henderson County mine at our River View Coal, LLC ("River View") mining complex. ​ Certain of our subsidiaries, primarily consisting of Matrix Design Group, LLC, its subsidiaries, and Alliance Design Group, LLC (collectively referred to as "Matrix Group"), manufacture a variety of products for our mining operations and third parties. These products are primarily consumed internally by our mining operations with associated inventory historically presented as supplies inventory. Recently Matrix Group has been increasing its production of products with the intention to increase third-party sales. We have therefore presented our manufactured goods inventories in the table above separately from our historical presentation of supplies inventory.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details
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