How are thick the coal beds in the US?

Coal beds in the United States vary significantly in thickness, typically ranging from a few feet to over 100 feet in some regions. The thickness can depend on the specific coal formation and geological conditions. Major coal-producing areas, such as the Appalachian region and the Illinois Basin, often feature thicker seams compared to other areas. Overall, the average thickness of coal seams can be around 5 to 20 feet in many productive coal fields.