Rainbow Rare Earths Ltd. announced the appointment of ANSTO Minerals in Australia to advance the flow sheet process optimisation at the Company's Phalaborwa Rare Earths Project in South Africa. ANSTO has world-leading expertise in the processing of critical and strategic minerals, including rare earths. With over 40 years' experience in providing practical solutions and innovative technology to industry, ANSTO's team of engineering, metallurgy, mineralogy, chemistry and geology experts is well-positioned to support Rainbow on this project. ANSTO has been engaged to perform scouting leach tests on drill samples from Phalaborwa to confirm the metallurgical variability within the gypsum stacks. Metallurgical test work will then be carried out to produce an optimised process flow sheet for the preliminary economic assessment/scoping study, based on the original Sasol bankable feasibility study-level flow sheet, which produced three tonnes of cerium depleted mixed rare earth carbonate directly from the gypsum. Phalaborwa's flow sheet is expected to be significantly simpler than those required for other rare earths projects around the world, as the rare earths exist in a 'cracked' chemical form within the two gypsum stacks, obviating the need for the costly and capital-intensive stages of first producing a concentrate and then 'cracking' it prior to beneficiation.