v3.25.3
Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment, Net

Property, plant, and equipment, net consisted of the following:

 

(In thousands)  September 30,
2025
   December 31,
2024
 
Plant and equipment  $373,891   $331,899 
Mining property and mineral rights   123,910    120,532 
Construction in process   17,581    31,048 
Capitalized mine development costs   216,609    199,595 
Less: accumulated depreciation, depletion, and amortization   (242,821)   (201,055)
Total property, plant, and equipment, net  $489,170   $482,019 
Schedule of Depreciation, Depletion, and Amortization

Depreciation, depletion, and amortization included:

 

   Three months ended
September 30,
   Nine months ended
September 30,
 
(In thousands)  2025   2024   2025   2024 
Depreciation of plant and equipment  $11,031   $9,519   $32,289   $27,408 
Amortization of right of use assets (finance leases)   2,191    2,648    6,085    8,025 
Amortization and depletion of capitalized mine development costs and mineral rights   3,869    5,644    13,297    13,476 
Total depreciation, depletion, and amortization  $17,091   $17,811   $51,671   $48,909