Japan says medium and heavy rare earths make up 54% of deep-sea mud found near Minamitorishima
AI Market Summary
Japan's successful deep-sea retrieval of rare-earth-rich mud (54% medium/heavy REEs) signals a potential medium-term diversification of critical mineral supply chains amid tighter China export controls. While deposit size remains unquantified and commercialization is years away, planned 2027 trial mining and 2028 feasibility assessment may influence expectations for strategic materials availability, with indirect implications for defense, EV, and semiconductor-related cost and supply risk.
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● Medium
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Japan said medium and heavy rare earth elements accounted for about 54% of the total rare earth content in mud lifted from the deep seabed near Minamitorishima island. Around 50 metric tons of mud were recovered, and the analysis identified elements including yttrium, gadolinium and dysprosium, according to the Cabinet Office’s national platform for innovative ocean development. The effort comes as Japan looks to diversify supplies amid China’s export controls on some heavy rare earths and related magnets introduced in April 2025 and later tightened for Japan. Japan plans a month-long large-scale mining trial starting in February 2027, targeting 350 tons of mud a day, with an industrialization assessment due by March 2028.
