Mount Ridley Mines files provisional patent for Selectro after recovering up to 83% heavy rare earths from Grass Patch—but scale-up and economics remain
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Mount Ridley Mines Limited
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About Mount Ridley Mines Limited
Mount Ridley Mines Limited is an Australian rare earth exploration company listed on the Australian Securities Exchange (ASX: MRD), focused on the upstream discovery and development of heavy rare earth elements. Its flagship Mount Ridley Project lies in the Esperance region of Western Australia, about 25 kilometres from the Port of Esperance, giving it logistical advantages for future export. The clay- and regolith-hosted deposit carries an inferred resource of roughly 122.5 million tonnes at 889 ppm TREO, containing approximately 108,954 tonnes of total rare earth oxides, including around 44,610 tonnes of heavy rare earth oxides at a premium 41% HREO ratio with notable dysprosium and terbium used in permanent magnets for electric vehicles and wind turbines. The Grass Patch Complex also colocates heavy rare earths with scandium and gallium. Metallurgical testing has reported heavy rare earth recoveries of up to 86.5% using conventional hydrochloric acid leaching.
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Mount Ridley Mines uses TIMA analysis to identify phosphate rare earth host minerals at Grass Patch, opening a potential flotation beneficiation pathway.
