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Mineral Interests and Property, Plant and Equipment, net
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Mineral Interests and Property, Plant and Equipment, net Mineral Interests and Property, Plant and Equipment, net
Mineral interests totaled $147.7 million and the related accumulated depletion totaled $75.5 million and $67.3 million as of December 31, 2024 and December 31, 2023, respectively.
Property, plant and equipment are summarized as follows (in thousands):
 December 31, 2024December 31, 2023
Land$77,351 $74,631 
Land improvements19,939 18,372 
Building and leasehold improvements73,543 38,223 
Asset retirement obligation assets62,301 60,898 
Mine development and infrastructure costs126,266 95,021 
Machinery and equipment1,435,650 1,087,635 
Financing lease right of use asset106,959 105,469 
Construction in progress513,072 425,124 
Total2,415,081 1,905,373 
Less: Accumulated depreciation(865,611)(725,764)
Property, plant and equipment, net$1,549,470 $1,179,609 
Depreciation and depletion expense was $154.0 million, $127.4 million, and $115.3 million, for the years ended December 31, 2024, December 31, 2023, and December 31, 2022, respectively. Construction in progress includes capitalized interest of $12.7 million, $12.1 million, and $1.4 million as of December 31, 2024, December 31, 2023, and December 31, 2022, respectively.