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…
Semi-anthracite
Semi-anthracite is a distinct rank of coal that occupies a middle ground between high-grade anthracite and the more common bituminous coals. It combines many of the advantageous physical and chemical…
