Low-ash coal
Low-ash coal is a high-quality variety of coal characterized by a relatively low proportion of mineral matter (ash) after combustion. Because ash lowers the fuel value, increases handling and disposal…
Short-flame coal
Short-flame coal is a distinct category within the broad family of coals, recognized in some regions and markets for its specific combustion behavior and material properties. This article explores what…
Long-flame coal
Long-flame coal is a historically important and still widely used category of coal characterized by its distinctive burning behavior, broad occurrence in many coal basins, and versatile industrial applications. This…
House coal
House coal — commonly sold as lumps of coal intended for domestic heating and small-scale use — remains an important yet controversial energy commodity in many parts of the world.…
Smithing coal
Smithing coal occupies a special place within the broad family of coals: it is the grade of coal historically and presently prized for metalworking, forge heat, and for producing coke…
Dry steam coal
This article explores the characteristics, occurrence, economic importance and industrial role of dry steam coal — a variety of coal primarily used for heat and power generation. Dry steam coal…
Lean coal
This article explores the technical, economic and geopolitical dimensions of what is commonly referred to as “lean coal” — lower-energy, lower-volatile types of coal often used for power generation rather…
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…
Black coal
This article examines black coal — also known as hard coal — its geological origins, global distribution, methods of extraction, economic importance, statistical overview, role in industry, environmental impacts and…
Industrial coal
Industrial coal plays a central role in modern economies as both an energy source and a feedstock for a range of industrial processes. This article explores the geology, distribution, extraction,…
