Japan has confirmed the presence of heavy rare-earth elements in seabed mud collected off the coast of Minamitorishima [1].
This discovery is a critical step in Japan's effort to diversify its mineral supply chains and reduce its strategic dependence on China, which frequently implements export restrictions on rare earths [1, 5].
The materials were retrieved in February 2026 [1, 2] by the research vessel Chikyū, operated by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) [1]. The samples were collected from the ocean floor at a depth of approximately 6,000 meters [2, 3].
Analysis of the mud confirmed the presence of rare earth elements categorized as "heavy," including yttrium [1]. According to a source, yttrium is utilized in the production of semiconductor manufacturing equipment [1]. The source said that the analysis confirmed rare earths were present in the mud off Minamitorishima [2].
Detailed analysis results are expected to be released to the public shortly [1]. To move toward commercial viability, the Cabinet Office plans to conduct demonstration tests starting in February 2027 [1].
These deep-sea deposits represent a potential domestic source of materials that are essential for high-tech industries. The project aims to ensure that Japan can maintain its technological edge in semiconductors, and electronics, without relying on volatile international markets [5].
“The samples were collected from the ocean floor at a depth of approximately 6,000 meters.”
The identification of heavy rare earths at such extreme depths suggests that Japan may have a viable long-term strategy to bypass geopolitical leverage held by dominant rare-earth exporters. While the technical challenge of mining at 6,000 meters is immense, the transition from scientific discovery to state-sponsored demonstration tests indicates a shift toward industrializing deep-sea resource extraction for national security.
