Medium-volatile bituminous coal
Medium-volatile bituminous coal is a widely used and geologically important type of hard coal that sits in the mid-range of the coal rank scale. It combines relatively high fixed carbon…
High-volatile bituminous coal
High-volatile bituminous coal occupies an important place among the ranks of coal used around the world. This article summarizes its geological characteristics, where it occurs and is mined, economic and…
Semi-anthracite
Semi-anthracite is a distinct rank of coal that occupies a middle ground between high-grade anthracite and the more common bituminous coals. It combines many of the advantageous physical and chemical…
