Bituminous coals also called soft coals or black coals are the group of coals that are the most abundant. It’s the type of coal that is most widely used in our world today. It’s been named so because of the presence of a tar-like & gluey type substance that is known as bitumen. Bituminous type coals are formed & created when a sub-bituminous type of coal is exposed to heating & very high pressure. Based on the coals volatility, bituminous type coals are divided into the categories of low-volatile bituminous coal , medium-volatile bituminous coal & finally high-volatile A, B, & C bituminous coal. High grades of bituminous coals can be found in the Appalachian regions of the states of Ohio, Kentucky, Pennsylvania, & in West Virginia. The highest production of this type of coal is in the state of West Virginia, then followed by Kentucky, then PennsylvaniaREAD MORE!