Segment Information (Tables)

12 Months Ended

Dec. 31, 2025

Schedule of Segment Reporting Information by Segment

Reportable segment results for the year ended December 31, 2025 are:


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Total
Revenues from External Customers	$	2,208,643	$	1,202,055	$	718,783	$	21,477
Intersegment Revenues	—		—		—		66,203
	2,208,643		1,202,055		718,783		87,680		$	4,217,161
Reconciliation of Revenue
Other Revenues (a)									13,817
Elimination of Intersegment Revenues									(66,203)
Total Consolidated Revenues									4,164,775
Less: (b)
Cash Costs of Revenue	1,252,525		868,839		643,601		30,841
Transportation Costs	364,888		276,935		11,317		—
Other Segment Items (c)	11,124		81,936		—		—
Adjusted EBITDA	$	580,106	$	(25,655)	$	63,865	$	56,839	$	675,155

Reconciliation of segment profit or loss measure to consolidated loss before income tax:
Other Profit or Loss (a)									2,940
Depreciation, Depletion and Amortization									(621,067)
General and Administrative Costs									(214,856)
Interest Expense									(40,124)
Interest Income									25,890
Loss on Debt Extinguishment									(11,680)
Non-Service Related Pension and Postretirement Benefit Costs									(25,728)
Idle Mine Costs									(24,145)
Other Operating Income, net									33,904
Other Costs									(33,992)
Loss Before Income Tax									$	(233,703)

(a) Revenue and profit or loss from segments below the quantitative thresholds are attributable to the revenue and expense from various corporate and diversified business activities excluded from our reportable segments.

(b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.

(c) Other segment items include other non-operating income and expenses that are not part of each segment’s ongoing operations.


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Corporate and Other (a)		Consolidated
Segment Assets (b)	$	2,107,970	$	2,020,450	$	261,193	$	91,930	$	1,648,510	$	6,130,053
Depreciation, Depletion and Amortization	$	207,891	$	252,882	$	33,177	$	5,621	$	121,496	$	621,067
Capital Expenditures	$	174,153	$	73,107	$	8,126	$	7,473	$	21,722	$	284,581

(a) Includes various corporate and diversified business activities excluded from our reportable segments to reconcile to consolidated totals.

(b) Represents assets as of December 31, 2025.

Reportable segment results for the year ended December 31, 2024 are:


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Total
Revenues from External Customers	$	2,004,567	$	113,067	$	—	$	31,064
Intersegment Revenues	—		—		—		56,682
	2,004,567		113,067		—		87,746		$	2,205,380
Reconciliation of Revenue
Other Revenues (a)									15,708
Elimination of Intersegment Revenues									(56,682)
Total Consolidated Revenues									2,164,406
Less: (b)
Cash Costs of Revenue	973,139		128,445		—		27,372
Transportation Costs	321,367		9,341		—		—
Other Segment Items (c)	—		(390)		—		—
Adjusted EBITDA	$	710,061	$	(24,329)	$	—	$	60,374	$	746,106

Reconciliation of segment profit or loss measure to consolidated earnings before income tax:
Other Profit or Loss (a)									4,731
Depreciation, Depletion and Amortization									(223,526)
General and Administrative Costs									(115,224)
Interest Expense									(22,192)
Interest Income									19,223

Non-Service Related Pension and Postretirement Benefit Costs									(17,384)
Idle Mine Costs									(4,859)
Other Operating Expense, net									(43,224)
Other Costs									(13,004)
Earnings Before Income Tax									$	330,647

(b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.

(c) Other segment items include other non-operating income and expenses that are not part of each segment’s ongoing operations.


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Corporate and Other (a)		Consolidated
Segment Assets (b)	$	1,739,792	$	140,798	$	—	$	88,146	$	910,807	$	2,879,543
Depreciation, Depletion and Amortization	$	172,997	$	8,635	$	—	$	4,889	$	37,005	$	223,526
Capital Expenditures	$	149,021	$	13,614	$	—	$	8,350	$	7,003	$	177,988

(a) Includes various corporate and diversified business activities excluded from our reportable segments to reconcile to consolidated totals.

(b) Represents assets as of December 31, 2024.

Reportable segment results for the year ended December 31, 2023 are:


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Total
Revenues from External Customers	$	2,359,796	$	98,939	$	—	$	47,900
Intersegment Revenues	—		—		—		58,266
	2,359,796		98,939		—		106,166		$	2,564,901
Reconciliation of Revenue

Elimination of Intersegment Revenues									(58,266)
Total Consolidated Revenues									2,506,635
Less: (b)
Cash Costs of Revenue	939,892		98,803		—		27,259
Transportation Costs	335,186		17,183		—		—
Other Segment Items (c)	(429)		(73)		—		—
Adjusted EBITDA	$	1,085,147	$	(16,974)	$	—	$	78,907	$	1,147,080

Reconciliation of segment profit or loss measure to consolidated earnings before income tax:
Other Profit or Loss (a)									(663)
Depreciation, Depletion and Amortization									(241,317)
General and Administrative Costs									(103,470)
Interest Expense									(29,325)
Interest Income									13,597
Loss on Debt Extinguishment									(2,725)
Non-Service Related Pension and Postretirement Benefit Costs									(7,011)
Idle Mine Costs									(4,515)
Other Operating Income, net									19,111
Other Costs									(12,890)
Earnings Before Income Tax									$	777,872

(a) Profit or loss from segments below the quantitative thresholds are attributable to the revenue and expense from various corporate and diversified business activities excluded from our reportable segments.

(b) The significant expense categories and amounts align with the segment-level information that is regularly provided to the CODM.

(c) Other segment items include other non-operating income and expenses that are not part of each segment’s ongoing operations.


	High CV Thermal		Metallurgical		PRB		Core Marine Terminal		Corporate and Other (a)		Consolidated
Segment Assets (b)	$	1,582,434	$	126,865	$	—	$	83,322	$	882,382	$	2,675,003
Depreciation, Depletion and Amortization	$	191,391	$	8,235	$	—	$	4,227	$	37,464	$	241,317
Capital Expenditures	$	144,550	$	12,656	$	—	$	4,568	$	6,017	$	167,791

(a) Includes various corporate and diversified business activities excluded from our reportable segments to reconcile to consolidated totals.

(b) Represents assets as of December 31, 2023.

Schedule of Revenue by Major Customers by Reporting Segments

Revenues from customers that exceeded 10% of consolidated revenues were as follows:


	Year Ended December 31,
	2025	2024		2023
Customer A (a)	(b)	$	240,990	$	283,115
Customer B (a)	(b)	$	220,537	$	286,041

(a) Revenues from this customer were principally included in the High CV Thermal segment.

(b) Revenues during these periods were less than 10% of the Company’s consolidated revenues.