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— Largest Coal Mining Companies Research Summary. The largest coal mining company in the U.S. is Peabody Energy, with a revenue of $4.89 billion.. As of 2022, the U.S. coal mining industry has a market size of $30.9 billion.. Despite decreasing over time, 535.4 million short tons of coal is still mined in the U.S. each year. The U.S. coal …