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Japan finds a large amount of rare earths in the mud from deep sea off a remote island

The Japanese government announced on Friday that an analysis of rare-earth-rich mud recovered from the deep seabed of a remote Pacific Island in early 'this year revealed that medium and heavy rare elements made up about 54% of the total rare earth content.

The company did not reveal the exact size or deposit of the sand, claiming that the sampling was too limited and geographically restricted to provide sufficient data.

Chikyu is a Japanese scientific drilling ship that completed a one-month mission near Minamitori Island in February, located about 1,900 kilometers (1,200 miles), southeast of Tokyo. This was the first successful attempt to continuously lift seabed mud containing rare earths from depths as deep as 6 km (4miles).

The project comes at a time when Japan is looking to diversify its mineral supply amid tightening Chinese controls on exports of heavy rare earths and related magnets that are vital for the automotive and defence industries.

About 50 metric tonnes of mud was recovered. According to the Cabinet Office’s National Platform for Innovative Ocean Development, the analysis revealed yttrium used in aerospace, energy, and semiconductor applications, gadolinium used in magnetic resonance images and other high-tech uses, and dysprosium used in high performance magnets for electric cars.

Japan is planning a large-scale mining trial that will last a month in the same waters starting February 2027. The goal is to drill 350 tons of mud per day. The material will be?dewatered on Minamitori Island, and then processed on the mainland to test separation, refining, and smelting technology.

Kazushige K. Kikuchi, Project Manager at the Japan Agency for Marine-Earth Science and Technology (which operates the Chikyu), said that the trial would be used to test the feasibility of domestic production of rare earths.

Beijing has tightened export restrictions to Japan, targeting large conglomerates, in January 2025. (Reporting and editing by Christian Schmollinger; Additional reporting by Chang Ran Kim; Additional reporting by Yuka Obayashi)

(source: Reuters)