Exhibit 99.1

Core Natural Resources, Inc.

Resource Extraction Payment Report

for the Fiscal Year Ended December 31, 2025

Segment

Project/Subnational Political Jurisdiction

Resource (Mineral) and Method of Extraction

Governmental Recipient/Country

Payment Type

Dollars (in thousands)

High CV Thermal

Pennsylvania

Coal - Underground Mining

U.S. Federal Government

Federal black lung excise taxes

$

12,726

Pennsylvania

Coal - Underground Mining

U.S. Federal Government

Federal reclamation fees

2,515

Pennsylvania

Coal - Underground Mining

U.S. Federal Government

Black lung benefits

226

Pennsylvania

Coal - Underground Mining

U.S. Federal Government

Other (a)

300

Colorado

Coal - Underground Mining

U.S. Federal Government

Federal royalties (c)

8,033

Colorado

Coal - Underground Mining

U.S. Federal Government

Federal black lung excise taxes

2,274

Colorado

Coal - Underground Mining

U.S. Federal Government

Federal reclamation fees

294

Colorado

Coal - Underground Mining

U.S. Federal Government

Other (a)

80

Total High CV Thermal

$

26,448

Metallurgical

West Virginia

Coal - Underground Mining

U.S. Federal Government

Federal reclamation fees

$

776

West Virginia

Coal - Underground Mining

U.S. Federal Government

Federal black lung excise taxes

581

West Virginia

Coal - Underground Mining

U.S. Federal Government

Black lung benefits

95

West Virginia

Coal - Underground Mining

U.S. Federal Government

Other (a)

755

Total Metallurgical

$

2,207

Powder River Basin

Wyoming

Coal - Open Pit

U.S. Federal Government

Federal royalties (c)

$

61,462

Wyoming

Coal - Open Pit

U.S. Federal Government

Federal black lung excise taxes

25,443

Wyoming

Coal - Open Pit

U.S. Federal Government

Federal reclamation fees

11,098

Wyoming

Coal - Open Pit

U.S. Federal Government

Federal rental fees

101

Total Powder River Basin

$

98,104

Corporate and Other

(b)

N/A

U.S. Federal Government

Federal excise tax on share repurchases

$

934

(b)

N/A

U.S. Federal Government

Federal income taxes (c)

$

450

(b)

N/A

U.S. Federal Government

Federal excise tax on pension plan liquidation

$

311

(b)

N/A

U.S. Federal Government

Federal excise tax on insurance premiums

$

268

Kentucky

Other (d)

U.S. Federal Government

Black lung benefits

$

1,393

West Virginia

Other (d)

U.S. Federal Government

Black lung benefits

$

1,102

Virginia

Other (d)

U.S. Federal Government

Black lung benefits

$

754

Ohio

Other (d)

U.S. Federal Government

Black lung benefits

$

337

Utah

Other (d)

U.S. Federal Government

Black lung benefits

$

137

Pennsylvania

Other (d)

U.S. Federal Government

Black lung benefits

$

132

Illinois

Other (d)

U.S. Federal Government

Black lung benefits

$

71

Tennessee

Other (d)

U.S. Federal Government

Black lung benefits

$

14

(a) This amount represents assessments issued by the federal Mine Safety and Health Administration.

(b) The U.S. federal government levies income taxes and certain excise taxes at the Core Natural Resources, Inc. (“Core”) level rather than on a per project basis. Income tax and certain excise tax payment information in the table above is presented at the Core entity level.

(c) Federal royalties and federal income taxes are presented net of refunds.

(d) Other represents black lung benefits related to idle operations.

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Exhibit 99.1

The following table summarizes Core’s total payments to the U.S. Federal Government by payment type (dollars in thousands):

						Fiscal Year Ended
						December 31, 2025
Federal royalties (a)						$	69,495
Federal black lung excise taxes						41,024
Federal reclamation fees						14,683
Black lung benefits						4,261
Federal income taxes (a)						450
Federal rental fees						101
Other federal excise taxes						1,513
Other (b)						1,135
Total payments to U.S. Federal Government						$	132,662

(a) Federal royalties and federal income taxes are presented net of refunds.

(b) This amount represents assessments issued by the federal Mine Safety and Health Administration.