Rainbow and Mosaic begin the Uberaba prefeasibility study
Rainbow Rare Earths announced on 7 September 2026 that it and Mosaic have started the Uberaba prefeasibility study in Brazil. Work programme SRK is working toward a maiden JORC mineral-resource estimate. Approximately six tonnes of feedstock have been shipped to South Africa for pilot testing. The prefeasibility study is expected in the second half of 2027. It will develop the technical and economic understanding of recovering rare earths from the project's material. What this stage establishes
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