v3.26.1
Components of Pension Plan Net Periodic Benefit Costs
6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Components of Pension Plan Net Periodic Benefit Costs

12.COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

Eligible employees at certain of our mining operations participate in a defined benefit plan (the “Pension Plan”) that we sponsor. The Pension Plan is closed to new applicants and participants in the Pension Plan are no longer receiving benefit accruals for service. The benefit formula for the Pension Plan is a fixed dollar unit based on years of service. Components of the net periodic benefit credit for each of the periods presented are as follows:

  ​ ​ ​

Three Months Ended

Six Months Ended

June 30, 

June 30, 

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

(in thousands)

Interest cost

$

1,268

$

1,310

$

2,537

$

2,620

Expected return on plan assets

 

(1,486)

 

(1,709)

 

(2,972)

 

(3,418)

Amortization of prior service cost

2

5

Net periodic benefit credit (1)

$

(218)

$

(397)

$

(435)

$

(793)

(1)Net periodic benefit credit for the Pension Plan is included in the Other income line item within our condensed consolidated statements of income.

We do not expect to make material contributions to the Pension Plan during 2026.