Mercury in U.S. Coal - Abundance, Distribution, and Modes of Occurrence

This paper discusses the environmental significance of mercury and its occurrence in U.S. coal beds as measured by the USGS's COALQUAL database. Useful diagrams and charts help explain mercury concentrations of in-ground coal by region, how mercury is released through coal combustion, and why using higher grade coals or physically cleaning coal can minimize mercury emissions during combustion. The paper also discusses additional studies to determine how the mode of occurrence of mercury in coal may influence the potential for toxic emissions. Educational levels: Graduate or professional, Undergraduate upper division