Forge coal
Forge coal occupies a unique niche within the wider family of fossil coals: a traditional fuel valued by smiths, foundries and small metallurgical operations for its workability and heat characteristics.…
Gas coal
This article explores the nature, distribution, economic importance and industrial uses of gas coal — a form of coal with distinctive physical and chemical properties that make it valuable for…
Non-coking coal
Non-coking coal, often referred to as thermal or steam coal, is one of the most widely used fossil fuels in the world. Unlike coking coal, which is suitable for metallurgical…
Carbonized coal
This article examines the nature, occurrence, processing and economic importance of carbonized coal — the coal that has undergone carbonization to yield high-carbon materials such as coke and other carbon…
Soft steam coal
This article explores the characteristics, distribution, economic role and industrial importance of soft steam coal. Soft steam coal—commonly identified with certain grades of bituminous coal used primarily for thermal applications—remains…
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…
Prime hard coking coal
Prime hard coking coal is a specialized grade of coal that plays a central role in the production of metallurgical coke and hence in large-scale steelmaking. This article examines where…
Premium metallurgical coal
Premium metallurgical coal occupies a strategic niche at the intersection of geology, heavy industry and global trade. Also commonly referred to in industry parlance as high-grade coking material, this coal…
H-grade coal
This article examines H-grade coal — a term often used in industry to denote higher-quality coal with significant heat output and specific properties that make it valuable for energy and…
G-grade coal
This article examines the properties, distribution, economic role and industrial significance of a category frequently referred to as G-grade coal. The term can have several meanings depending on national standards…
