• Technology produces high purity rare earth oxide (REO) concentrate without solvent extraction technology for impurity removal
• Proprietary technology designed to:
  • Increase recoveries of rare earth elements and the grade of the concentrate increased from approximately 45% to 90+%.
  • Provide reduced raw material requirements through recycling and regeneration of acid
  • Enhance management of byproducts and process residues
  • Provide enhanced ability to further separate and upgrade final rare earth products
  • Provide environmental benefits from reduced "environmental footprint"
• Provisional U.S. Patent filed for "Rare Earth Element Extraction" process technology

Lakewood, Colorado – Rare Element Resources Ltd. (NYSE MKT: REE; TSX: RES) (the "Company") is pleased to provide further information regarding its proprietary process technology that enhances the efficiency of rare earth recovery. The new metallurgical process consists of Hydrochloric (HCl) acid leaching at moderate temperature, selective precipitation of rare earth elements (REEs) with oxalic acid, and calcination of REE oxalates at elevated temperature to produce a high purity mixed REO powder, with accompanying capture of kiln flue gases

Jaye Pickarts, Chief Operating Officer, stated "We are extremely pleased with the development to-date of this exciting technology, and the potential benefits the proprietary process brings to the project and our customers. As we continue our lab scale testwork, the final results will support our upcoming definitive feasibility study, scheduled to start in mid-2013".

The rare earth ore from the Bull Hill mine will be upgraded physically on site to produce the REE-rich pre-concentrate solids for treatment at the hydrometallurgical facility in Upton, Wyoming. The process will employ a hot chloride solution to extract over 90% of the REEs into a pregnant leach solution (PLS). Using closed reactor vessels, the PLS will react with oxalic acid powder under optimized conditions to facilitate selective precipitation of REEs. Approximately 95-99% of REEs are precipitated from the PLS, leaving behind all the major base metals in solution.

The REE-rich oxalate precipitates are converted to their oxide form in a calcination process. The mass of REE-oxalates is reduced by as much as 50% and the calcine powder contains 90+% pure mixed REO. This is a significant improvement from the 45% concentrate which was used as the basis for the economic calculation in the Preliminary Feasibility Study completed in 2012. The REO powder can be re-dissolved selectively in an appropriate acid to isolate traces of residual impurities, or it could be sold to a third party refinery. The filtrate or barren PLS from the oxalate reactor contains a significant amount of HCl acid, which is recovered by distillation. The vapor is condensed by cooling water and contains approximately 20% hydrochloric acid. This acid is then recycled for use in the chloride leach circuit. The number of process reagents is significantly reduced, and the economic benefit of recycling HCl acid to the leach reactors is significant.

The process was tested successfully in a bench scale program and is currently being corroborated at two commercial metallurgical laboratories. We anticipate the availability of results within the next several weeks, at which time we will provide an update. Following the successful completion of the testwork, the process technology will be incorporated into our planned pilot plant testwork, leading to the formal start of our definitive feasibility study in mid-2013.

Rare Element Resources has filed a provisional patent with the U.S. Patent Office regarding oxalate process technology for the recovery of rare earth products from its Bear Lodge Project.

For information please refer to the Company's website at www.rareelementresources.com or contact David Suleski, 720-278-2468.

Rare Element Resources Ltd. is a publicly traded mineral resource company focused on exploration and development of rare-earth elements (REEs), with a significant distribution of critical rare earths (CREEs). In addition to the REE exploration and evaluation efforts, the Company controls the Sundance gold project, which is located on the same property in Wyoming.