Rare earth elements and yttrium in Pennsylvanian coals and
Oct 15, 2020#0183;#32;Concentrations of REY ranged from 164 ppm in raw Springfield coal from the Oaktown Mine to 460 ppm in raw Springfield coal from the Bear Run Mine. For the Danville Coal from the Bear Run Mine and Springfield Coal from the Oaktown Mine where raw and washed fractions were analyzed, the washed product yielded significantly more REY than the raw