Primary coal
This article examines coal in its many dimensions: geological origin, global distribution, methods of extraction, economic importance, statistical trends, industrial applications and the environmental and policy debates surrounding it. Coal…
Geologically immature coal
This article examines the nature, distribution, extraction, economic role and industrial importance of geologically immature coal, commonly referred to as lignite or brown coal. Often overlooked in global energy debates…
Geologically mature coal
Geologically mature coal represents the high end of the coalification continuum: material that has been subjected to prolonged burial, heat and pressure, and in many cases tectonic deformation and regional…
Deep-mine coal
Deep-mine coal—coal extracted from underground seams by deep or underground mining methods—remains a crucial but complex component of the global energy and materials system. This article examines what deep-mine coal…
Shallow-mine coal
Shallow-mine coal — coal extracted from deposits close to the surface — plays a major but sometimes overlooked role in the global fossil-fuel economy. This article examines where such coal…
Underground-mine coal
Underground-mine coal — commonly referred to as coal extracted from deep seams below the earth’s surface — remains a cornerstone of global industry, energy systems and regional economies. This article…
Open-pit coal
This article examines open-pit coal — one of the most visible and economically significant forms of fossil-fuel extraction. It covers where this coal is found, how it is mined, the…
Aged lignite
This article examines aged lignite — commonly known as lignite or brown coal — from geological, technical, economic and environmental perspectives. It explains what distinguishes aged lignite from fresh coal,…
Young lignite
Younger forms of coal commonly known as lignite or brown coal occupy a unique place in the global energy landscape. Formed in relatively recent geological times, these deposits are typically…
Soft brown coal
Soft brown coal, commonly known as lignite, is a low-rank type of coal that plays a distinct role in the global energy mix and regional economies. Characterized by high moisture…
