hard-coal
31Coal mining — Men leaving a UK colliery at the close of a shift Surface coal mining in Wyo …
32coal — coalless, adj. /kohl/, n. 1. a black or dark brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. Cf. anthracite, bituminous coal, lignite. 2. a piece of glowing, charred, or burned wood or other… …
33Coal-mining region — World coal producers and consumers. Coal reserves in BTUs as of 2009 …
34Coal Seams of the South Yorkshire Coalfield — The coal seams worked in the South Yorkshire coalfield lie mainly in the middle coal measures. These are a series of mudstones, shales, sandstones, and coal seams laid down during the Carboniferous period about 350 million years ago. The total… …
35Coal Classification — In the United States, coals are classified by rank progressively from lignite (least carbonaceous) to anthracite (most carbonaceous) based on the proximate analyses of various properties (fixed carbon, volatile matter, heating value, and… …
36Coal seam fire — A coal seam fire near Denniston, New Zealand A coal seam fire or mine fire is the underground smouldering of a coal deposit, often in a coal mine. Such fires have economic, social and ecological impacts. They are often started by lightning, grass …
37Coal Strike of 1902 — The Coal Strike of 1902 was a strike by the United Mine Workers of America in the anthracite coal fields of eastern Pennsylvania. Miners were on strike asking for higher wages, shorter workdays, and the recognition of their union. The strike… …
38Coal Region — This article is about coal mining region in northeast Pennsylvania. For coal mining regions in general, see coal mining region. Anthracite Coal fields of Pennsylvania …
39coal — /koʊl / (say kohl) noun 1. a black or brown carbon based sedimentary rock formed by the accumulation and decomposition of plant material in layers and used as a fuel; main types are hard coal (anthracite), soft coal (bituminous coal), brown coal… …
40coal — I (New American Roget s College Thesaurus) n. ember, cinder; charcoal, briquette (see fuel). See heat. II (Roget s IV) n. 1. [Mineral fuel] Syn. mineral coal, coke, fossil fuel; see fuel . Types of coal include: hard coal, soft coal, charcoal,… …
