A pit of coal is a large hole or excavation in the ground where coal is mined. There are several synonyms for this term that can be used interchangeably. Some of these include a coal mine, coal pit, coalface, colliery, coal seam, and coalfield. These terms describe different aspects of the mining process, such as the actual site of the excavation, the seam of coal being mined, or the entire mining area. They all describe the same thing, which is the location where coal is extracted from the earth and processed for use as fuel. Regardless of the specific term used, each one conveys the same meaning to the listener or reader.