Our Insights blog presents deep data-driven analysis and visual content on important global issues from the expert data team at Knoema.معرفة المزيد
Quick data summaries and visualizations on trending industry, political, and socioeconomic topics from Knoema’s database.E-Commerce Prompting Innovation by Traditional Postal Services The Global Opportunity Index 2018 The High Burden of US Housing Costs معرفة المزيد
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An estimate of coal reserves, based on a demonstrated reserve base, adjusted for assumed accessibility and recovery factors, and does not include any specific economic feasibility criteria. 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 agglomerating character), following methods prescribed by the American Society for Testing and Materials. The International Coal Classification of the Economic Commission for Europe recognizes two broad categories of coal, “brown coal” and “hard coal.” In terms of U.S. coal classification, the international classification of brown coal includes lignite and lower-ranked subbituminous coal, whereas hard coal includes all higher rank coals.
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