Definitions for "Subbituminous coal"
Keywords:  lignite, bituminous, btu, coal, dull
Young black coal with high moisture content of between 15 and 40 percent by weight. In the U.S. the most often cited example is the Power River Basin coal found in Wyoming and Montana. Heating value varies from 7,000 Btu/lb to slightly over 9,000 Btu/lb. This type of coal is considered by many to have the largest reserves by weight around the world. Countries such as Indonesia and Malaysia have much more subbituminous coal that bituminous coal. Sulfur value is typically quire low, and ash is also usually low. Volatile matter is usually high, and can exceed 40% of the weight of the cal "as received."
A coal whose properties range from those of lignite to those of bituminous coal and used primarily as fuel for steam-electric power generation. It may be dull, dark brown to black, soft and crumbly, at the lower end of the range, to bright, jet black, hard, and relatively strong, at the upper end. Subbituminous coal contains 20 to 30 percent inherent moisture by weight. The heat content of subbituminous coal ranges from 17 to 24 million Btu per ton on a moist, mineral-matter-free basis. The heat content of subbituminous coal consumed in the United States averages 17 to 18 million Btu per ton, on the as-received basis (i.e., containing both inherent moisture and mineral matter).
A rank of coal intermediate between lignite and bituminous coal.