The Japanese government announced Friday that deep-sea mud collected near Minamitorishima contains significant amounts of heavy rare earth elements [1].
This discovery is a critical step toward securing domestic raw materials for Japan's high-tech industries. By establishing a local source of these minerals, Japan aims to reduce its strategic dependence on China for essential components used in electronics and green energy technology [3, 5].
The analysis, conducted by the Cabinet Office, the Science and Technology Promotion Agency (SIP), and the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), identified elements such as yttrium and neodymium [1, 4]. According to the findings, heavy rare earths account for approximately 54% [2] of the rare earth content in the samples.
To retrieve the material, researchers utilized the deep-sea drilling vessel "Chikyu" to reach the ocean floor at a depth of approximately 6,000 meters [4]. The operation successfully tested a new method for the continuous lifting of mud to the surface [3].
Program Director Shoichi Ishii said, "We were able to establish a world-first continuous mud lifting technology from the deep sea floor that minimizes the impact on the deep-sea environment" [3].
While some reports state that approximately 50 tons of mud were collected [3], other sources indicate that the total volume of the recovered material has not been officially disclosed [2]. The project focused on ensuring that the extraction process remains environmentally sustainable while proving the technical feasibility of large-scale recovery [3, 5].
“Heavy rare earths account for approximately 54% of the rare earth content in the samples.”
The ability to extract heavy rare earths from a depth of 6,000 meters transforms Japan's resource security landscape. Because these elements are vital for permanent magnets and advanced semiconductors, moving from theoretical deposits to proven recovery technology provides a hedge against geopolitical supply chain disruptions. However, the transition from experimental lifting to commercial-scale mining will require balancing industrial needs with the preservation of fragile deep-sea ecosystems.
