Mineral interests totaled $189.6 million and $147.7 million and the related accumulated depletion totaled $82.4 million and $75.5 million as of December 31, 2025 and December 31, 2024, respectively.

Property, plant and equipment are summarized as follows (in thousands):


	December 31, 2025			December 31, 2024
Land	$	77,406		$	77,351
Land improvements		82,422			19,939
Building and leasehold improvements		144,744			73,543
Asset retirement obligation assets		48,734			62,301
Mine development and infrastructure costs		208,538			126,266
Machinery and equipment		1,870,215			1,435,650
Financing lease right of use asset		206,303			106,959
Construction in progress		203,696			513,072
Total		2,842,058			2,415,081
Less: Accumulated depreciation		(1,024,694	)		(865,611	)
Property, plant and equipment, net	$	1,817,364		$	1,549,470

Depreciation and depletion expense was $188.6 million, $154.0 million, and $127.4 million, for the years ended December 31, 2025, December 31, 2024, and December 31, 2023, respectively. Capitalized interest was $12.2 million, $12.7 million, and $12.1 million as of December 31, 2025, December 31, 2024, and December 31, 2023, respectively.