NETL is partnering with XLight Corporation to identify, locate, field sample, and chemically analyze U.S. domestic coal and coal by-product solid and/or liquid materials that contain high rare earth element (REE) concentrations (i.e., ≥300 ppm total REEs). This project supports NETL’s REE Program by identifying U.S. coal-based resources for developing technologies to separate and recover rare earth elements for use in producing commercial products and national defense equipment.