High-BTU coal
High-BTU coal is a category of fossil fuel prized for its high energy content per unit mass and strong industrial applications. In many energy and metallurgical markets, this coal commands…
Chemical-grade coal
This article examines the specialised category commonly called chemical-grade coal — varieties of coal selected or processed for use as a raw material in chemical, metallurgical and high-value industrial applications.…
Hard steam coal
Hard steam coal is a widely used category of solid fossil fuel, valued for its relatively high energy content and versatility across power generation and industrial processes. This article examines…
Fat coal
Fat coal — a traditional term used in many coal-producing countries — denotes a high-quality type of coal valued for its energy content and physical behavior during heating. Often associated…
Lignite
This article explores lignite — the lowest-rank form of coal often called “brown coal” — examining its geological origins, physical and chemical properties, where it occurs and is mined, its…
Low-volatile bituminous coal
Low-volatile bituminous coal is a high-rank coal grade prized for its elevated carbon content, strong coking properties and relatively low volatile matter. This article examines its geological characteristics, global distribution,…
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…
Bituminous coal
Bituminous coal is one of the most important and widely used ranks of coal worldwide. It occupies an intermediate position in the coalification scale between sub-bituminous coal and anthracite, combining…
Anthracite
Anthracite is the highest rank of coal, prized for its high-grade energy content and distinctive physical properties. This dense, hard variety of coal has played an important role in industry,…
