Application of a Hand-held XRF Unit to Establish the Lineal Extent of Rare Earth Element Concentration in Investigative Cores

摘要

1. Early to Middle Pennsylvanian period (300 M years)rn2. REE concentrations in LK coals ~ 10 ppmrn3. Seams originally mined as deep mine sites (MK core at > 700 ft.)rn4. Typically of sedimentation origin (erosion of magmatic deposits)rn5. Coal seams interspersed with shale and sometimes sandstones.