An official website of the United States government.
Here’s how you know
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.
The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
For workplace safety and health, please call 800-321-6742; for mine safety and health, please call 800-746-1553; for Job Corps, please call 800-733-5627 and for Wage and Hour, please call 1-866-487-9243 (1 866-4-US-WAGE). This website is currently not being updated due to the suspension of Federal government services. The last update to the site was 10/1/2025. Updates to the site will start again when the Federal government resumes operations.
A miner received fatal injuries while attempting to add a boom extension to a crane. In the process of removing the boom pins, the miner was struck by the boom.
The information provided in this notice is based on preliminary data ONLY and does not represent final determination regarding the nature of the incident or conclusions regarding the cause of the accident.
MINE FATALITY – On July 21, 2021, a miner received fatal injuries while adding a boom extension to a crane. The miner was working under the boom to remove the boom pins when he was struck by the boom.
FAI-6462383-1
UNITED STATES
DEPARTMENT OF LABOR
MINE SAFETY AND HEALTH ADMINISTRATION
REPORT OF INVESTIGATION
Surface
(Coal)
Fatal Machinery Accident
July 21, 2021
Black Thunder
Thunder Basin Coal Company LLC
Wright, Campbell County, Wyoming
ID No. 48-00977
Accident Investigators
Lois Duwenhoegger
Mine Safety and Health Inspector
