Raw anthracite
Raw anthracite is one of the highest-ranking coals in terms of carbon content and energy density. It has been valued for centuries for its distinctive physical and chemical properties, and…
Raw sub-bituminous coal
This article examines raw sub-bituminous coal: its nature, where it occurs, how and where it is mined, its economic and industrial roles, and environmental and policy considerations. Sub-bituminous coal occupies…
Reworked coal
This article examines the geological, economic and industrial aspects of reworked coal — an intriguing category of coal that has been transported, eroded, oxidized or otherwise altered after initial formation.…
Heating coal
Heating coal plays a continuing and complex role in the modern energy system. This article explores the geological occurrence, mining and processing, global production and trade, economic importance, industrial uses,…
