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…
Wara Coal Mine – Indonesia
The Wara Coal Mine in Indonesia is one of many mining sites contributing to the country’s significant role in the global coal market. This article examines the mine’s location, geological…
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…
Tutupan Coal Mine – Indonesia
The Tutupan coal mine is one of Indonesia’s most significant coal-producing sites, forming a central part of the country’s export-oriented mining industry. Located in the resource-rich region of Kalimantan, Tutupan…
Dull coal
This article examines the topic of dull coal — a descriptive classification of coal distinguished by its matte appearance, particular physical and chemical characteristics, and specific industrial uses. Dull coal…
Low-caking coal
Low-caking coal is a specific category of coal defined by its limited tendency to soften, swell and fuse when heated in the absence of air. Unlike coking or strongly caking…
Low-plasticity coal
This article explores the characteristics, geological occurrence, economic significance and industrial uses of low-plasticity coal. Low-plasticity coal is a distinct category in coal petrography and technological classification: it does not…
Low-swelling coal
This article explores the characteristics, occurrence, extraction, economic role and industrial uses of low-swelling coal. Low-swelling coals form an important segment of the global coal resource base. Although they are…
Low-fluidity coking coal
Low-fluidity coking coal occupies a particular niche within the family of metallurgical coals. It does not flow or swell as much as high-fluidity coals during carbonization, yet it can be…
