
Coal production in the U.S. by on coalbed thickness 2021
There was roughly 23.2 million short tons of coal produced underground from coal beds with thicknesses of 79 to under 85 inches in the United States in 2021. At that same time, there was some 288.4 million short tons of coal produced on surface mines from coal beads with thicknesses over 120 inches during the same period.