NETL R&IC (Research and Innovation Center (formerly ORD - Office of Research and Development) has developed a data base with REE field sample inventory and analytical characterization results for coal and related by-product materials collected from different coal regions, in various stages of the process, and at various locations. The focus of this study is to characterize the bulk elemental concentration and mineralogy of rare earth elements in all coals and coal by-product material including: mineral matter associated with coal, fly ash, bottom ash, and post-processing/post-use materials among others.