v3.25.4
PROPERTY, PLANT, AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2025
PROPERTY, PLANT, AND EQUIPMENT  
Schedule of Property, plant, and equipment

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December 31, 

(In thousands)

​

2025

  ​ ​ ​

2024

Plant and equipment

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$

390,359

​

$

331,899

Mining property and mineral rights

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​

139,077

​

​

120,532

Construction in process

​

 

22,264

​

 

31,048

Capitalized mine development costs

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221,852

​

 

199,595

Less: accumulated depreciation, depletion, and amortization

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(261,609)

​

 

(201,055)

Total property, plant, and equipment, net

​

$

511,943

​

$

482,019

Schedule of Depreciation, depletion, and amortization

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Year ended December 31, 

(In thousands)

  ​ ​ ​

2025

  ​ ​ ​

2024

​

2023

Depreciation of plant and equipment

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$

43,348

​

$

37,283

​

$

30,913

Amortization of right of use assets (finance leases)

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​

7,840

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​

10,414

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​

8,547

Amortization and depletion of capitalized

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​

​

​

​

​

​

​

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mine development costs and mineral rights

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16,967

​

 

17,918

​

 

14,792

Total depreciation, depletion, and amortization

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$

68,155

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$

65,615

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$

54,252

​