Subbituminous coal is a type of coal that is less carbon-rich and slightly lower in energy content compared to other types of coal. It is formed from plant remains that have been subjected to less heat and pressure over time.
Sentences with «subbituminous coal»
Production of subbituminous coal in Wyoming more than compensated for this decline in terms of volume and — according to its stated reserves — this trend can continue for another 10 to 15 years. (resilience.org)
By contrast, the share for subbituminous coal rose from 18 percent in 1980 to 25 percent in 1992, while the share for lignite grew from 6 percent to 9 percent. (eia.gov)
Wyoming produces the vast majority of subbituminous coal in the U.S. (eia.gov)