5 Largest Coal Mining Companies in USA

4. ACNR Holdings

Coal production in 2021 (thousand short tons): 40,153

Market cap as at 20th April 2023 (in billions): N/A

American Consolidated Natural Resources, or ACNR, claims to be the biggest underground coal mining company in the U.S. The company changed its name to ACNR after undergoing bankruptcy in 2020. Previously, it was known as Murray Energy.