Project Name: Black Thunder Coal Lease Modifications

NEPA Number: DOI-BLM-WY-P070-2026-0052-EA

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Project Information

NEPA Number

DOI-BLM-WY-P070-2026-0052-EA
Project Name

Black Thunder Coal Lease Modifications
Project Type

EA
NEPA Status

Completed - Completed
Lead Office

Buffalo Field Office
Last Updated

07/13/2026 - 12:00 AM

Project Description

Ark Land LT LLC, (Ark) submitted an application for modifications to two of their federal coal leases, Nos. WYW-150318 and WYW-176096, with the Bureau of Land Management (BLM) Wyoming State Office (WSO) (Core 2026). Ark is seeking approval to modify the leases to add approximately 939 acres and 940 acres containing an estimated 124.66 and 114.64 million tons of recoverable coal, respectively of federal coal (Figure A2) under the provisions of 30 U.S.C. § 203 and 43 Code of Federal Regulations (CFR) Part 3430, Subpart 3432. Ark is the sole surface owner within the proposed LMAs. According to the application, the coal in this tract would be mined to extend the life of the Black Thunder Coal Mine.

Project Location

City	State/Territory	Zip Code	County(ies)
Wright	Wyoming	82732	Campbell

Application Information

Applicant

Ark Land LT LLC
Program

Mining
Sub-Program

Coal

Project Dates

Start Date

5/5/2026
Decision Date

6/12/2026
NEPA Completion Date

6/12/2026
FONSI Date

6/12/2026

Project Office Information

Lead Office

Buffalo Field Office
Offices

Buffalo FO

Contacts

Contact 1 Name

Thomas (Tom) Bills
Contact 1 Email

[email protected]
Contact 1 Phone

(307) 684-1133

Contact 2 Name

Casey Freise
Contact 2 Email

[email protected]
Contact 2 Phone

(307) 684-1189