Bailey Mine in Pennsylvania, United States, was the largest underground coal-producing mine in the North America region, producing approximately 10.7 million tonnes of coal and an estimated 14.29 million metric tons per annum (mmtpa) of Run-of-Mine (ROM) in 2021. The Bailey Mine is owned by Consol Energy Inc. The second largest underground coal-producing mine with an estimated production of 10.1 million tonnes of coal and approximately 13.33 mmtpa of ROM, was the Black Otter Project located in Montana, United States. The Black Otter Project is owned by Gunvor Group Ltd.
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