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The United States of America is the top country by reserves of anthracite and bituminous coal in the world. As of 2018, reserves of anthracite and bituminous coal in the United States of America was 220,167 million tons that accounts for 30.36 % of the world's reserves of anthracite and bituminous coal. The top 5 countries (others are China, India, Australia, and Russian Federation) account for 81.09 % of it. The world's total reserves of anthracite and bituminous coal was estimated at 725,216 million tons in 2018.The description is composed by our digital data assistant.
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.