World Coal Geography

World Agriculture, Resources and Trade already covers world coal production leaders: China mines roughly half the world's coal on its own, with India a distant second and Indonesia third. This note does not repeat those figures; it covers what that note does not, coal's own grading system and the world's classic named coalfields, exactly the kind of named-term and named-place knowledge a dedicated coal chapter is testing.

Grading coal by carbon content

Coal is graded along a single continuous scale, and the grade names describe the coal's own carbon content and energy value, not where it happens to be mined. Lignite (brown coal), at the lower end, has a carbon content of roughly 60 to 70 percent, a correspondingly lower energy value, and is generally burned close to where it is mined, since its lower energy density makes long-distance transport uneconomical relative to its heating value. Bituminous coal, the most abundant grade mined worldwide, carries roughly 76 to 86 percent carbon and is the standard fuel for both electricity generation and, in its higher grades, steel-making (as coking coal). Anthracite, the highest grade, has the highest carbon content and energy density of any coal type and burns the cleanest, but it makes up only a small fraction, often cited at around one percent, of the world's total coal resources, because the specific, intense geological pressure and heat needed to form it (typically where a coal-bearing sedimentary basin has been buried and compressed during mountain-building) occurs only in limited settings; Pennsylvania's own anthracite region in the United States is the standard named example of where those exact conditions were met.

The world's classic named coalfields

Several individual coalfields are named often enough in this chapter's own tradition to be worth holding as a fixed list. The Ruhr coalfield in Germany historically anchored the industrial development of the whole Ruhr Valley region, supplying the coking coal that fed the area's steel industry and made it one of the earliest and most significant industrial regions in continental Europe. The Appalachian coalfield, spanning several eastern US states, is the classic named coalfield of North America and remains a major source of both thermal and coking coal in the United States today. The Donets Basin (Donbas), straddling eastern Ukraine and adjoining Russia, is Eastern Europe's own classic coalfield and historically anchored the region's own heavy industry the same way the Ruhr anchored Germany's. Britain's South Wales coalfield played the equivalent role in the United Kingdom's own industrial revolution. Within India, the Damodar Valley coalfields of Jharkhand and West Bengal, including the Jharia and Raniganj fields, are the country's own historically dominant coal-mining belt and the reason the Damodar Valley Corporation, India's first multipurpose river valley project, was sited exactly where it was.

Quick revision points

• Coal grades run on a single carbon-content scale, not a geographic one: lignite (60-70% carbon, low energy, burned near the mine), bituminous (76-86% carbon, most abundant, used for power generation and, as coking coal, steel-making), anthracite (highest carbon and energy content, cleanest-burning, but only about 1% of world coal resources due to the specific pressure and heat needed to form it).
• Classic named coalfields: the Ruhr (Germany, anchored the region's steel industry), Appalachian (eastern United States), Donets Basin/Donbas (Ukraine/Russia), South Wales (United Kingdom).
• India's own classic coalfield belt is the Damodar Valley (Jharia and Raniganj fields, Jharkhand and West Bengal), the reason the Damodar Valley Corporation was sited there.
• For production leaders (China, India, Indonesia and the rest of the ranking), see World Agriculture, Resources and Trade, which already covers this chapter's production-statistics half.