Japan US Critical Minerals Cooperation Expands Into Deep-Sea Resources and Recycling

US, Japan critical minerals Cooperation

Japan US critical minerals cooperation is moving into a broader strategic phase as both countries seek more resilient supply chains for rare earths, copper, nickel, and battery materials. Japanese prime minister Sanae Takaichi and US president Donald Trump agreed to expand collaboration during a summit in Washington.

Japan US critical minerals cooperation now includes an initial agreement on deep-sea mineral development. The agreement covers resources such as rare earth-rich mud around Minamitorishima and manganese nodules, which could become alternative supply sources outside conventional land-based mining.

Japan US critical minerals cooperation also reflects a shared concern over China’s dominant position in rare earth separation and refining. Both governments are trying to combine Japanese technology, US regulatory frameworks, and private-sector investment to accelerate non-China supply options.

Deep-Sea Minerals Add a New Layer to Rare Earth Security

Deep-sea mineral development could become a strategic supply route for rare earths and other critical minerals. Japan has long studied rare earth-rich mud near Minamitorishima, while manganese nodules offer potential exposure to metals used in batteries, alloys, and advanced industrial systems.

The new working group between Japan’s trade and industry ministry Meti and the US Department of Commerce will focus on technical cooperation. This structure suggests both governments want to move beyond political statements and build practical project-level collaboration.

The industrial meaning is clear. Rare earth supply security depends not only on mining rights, but also on separation technology, environmental standards, financing, and downstream demand from magnets, EV motors, defense systems, and renewable energy equipment.

Recycling, Copper, and Nickel Projects Broaden the Supply Chain Agenda

The summit also highlighted private-sector initiatives that extend beyond deep-sea resources. Mitsubishi Materials is considering cooperation with ReElement Technologies on rare earth recycling in Indiana, targeting recovery from used magnets and other secondary sources.

This recycling angle is important because magnet scrap can become a strategic rare earth feedstock. It also reduces dependence on primary mining and supports a circular supply model for high-value elements such as neodymium, praseodymium, dysprosium, and terbium.

Mitsubishi is also advancing a feasibility study for the Copper World project in Arizona, where it holds a 30pc stake alongside Hudbay Minerals. The project aims to produce around 100,000 tonnes per year of copper from around 2029, strengthening North American copper supply for electrification, grids, and manufacturing.

Sumitomo Metal Mining’s plan to expand nickel matte production at its Hyuga smelter adds another battery materials dimension. Supported by Meti subsidies under Japan’s economic security framework, the project links Japanese refining capacity with battery material security for both Japan and the US.

The Metalnomist Commentary

The Japan-US agenda shows that critical minerals cooperation is no longer limited to mining deals. The real strategy is to connect deep-sea resources, recycling, copper projects, nickel refining, and government-backed industrial policy into one supply chain security framework.