Highlights

• China controls 70% of rare earth mining but 85-90% of refining capacity—processing, not mining, is the real choke point likely to persist through 2035.
• Japan reduced vulnerability after 2010 export restrictions by diversifying suppliers, advancing magnet technology, and expanding recycling rather than competing on production scale.
• Resilience comes from smarter strategies: supply diversification, reduced material intensity, circular supply chains, and governance standards—not self-sufficiency.

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A new preprint study led by Dr. Qinxue Wang of the National Institute for Environmental Studies (NIES), Tsukuba, Japan, examines how Japan—one of the world’s most advanced manufacturing economies but with almost no domestic rare earth resources—has navigated a global rare earth system overwhelmingly dominated by China.

Drawing on data from the U.S. Geological Survey, the International Energy Agency, and extensive academic and policy literature, Wang’s analysis finds that while China continues to control roughly 70% of global rare earth mining and as much as 85–90% of refining and separation capacity, Japan has built resilience not by trying to out-mine China, but by substituting volume with technology, diversification, recycling, and governance.

The study concludes that China’s dominance in processing is likely to persist well into the 2030s—but that countries like Japan can still reduce strategic vulnerability through smarter, more targeted strategies rather than direct scale competition.

Study Methods: How the Analysis Was Conducted

Rather than presenting new field data, the study is a comprehensive policy and systems review. Wang synthesizes geological studies, industrial reports, government policy documents, and international datasets to examine rare earth supply chains from mine to magnet.

The paper applies a three-scenario framework for 2030–2035—conservative, central, and ambitious—to explore how non-Chinese supply, recycling, and technology innovation might evolve. These scenarios are calibrated using widely cited sources such as USGS Mineral Commodity Summaries and the IEA’s Global Critical Minerals Outlook, making the findings accessible while remaining grounded in mainstream data.

Key Findings: China’s Processing Dominance Is the Real Choke Point

A central takeaway is that rare earth vulnerability is less about mining and more about processing. While rare earth elements are geologically widespread, converting ore into usable high-purity oxides, metals, and magnets is technically complex, environmentally sensitive, and capital-intensive. China built this capability over decades through state support, scale, and looser environmental enforcement in earlier years.

Even under optimistic assumptions where new projects come online in Australia, the United States, and Southeast Asia, the study finds that China is likely to remain the single largest processor through at least 2035.  A scenario Rare Earth Exchanges’ own assessment concur with.  In a “central” scenario, China’s share of global mining may fall from about 70% today to roughly 50–55%, but its refining share would still remain dominant. In other words, diversification reduces risk but does not eliminate dependence.

Japan’s Response: Technology Over Tonnage

Japan’s strategy, according to the study, is notably pragmatic. After China restricted rare earth exports in 2010—when roughly 90% of Japan’s imports came from China—Tokyo pivoted toward a three-pillar approach:

1. Diversification through equity stakes and long-term offtake agreements, particularly with Australia’s Lynas Rare Earths.
2. Technological innovation, including high-purity separation, advanced magnet design that reduces dependence on scarce heavy rare earths like dysprosium and terbium, and urban mining.
3. Recycling and governance, using stockpiles, ESG standards, and traceability to lower both supply risk and environmental harm.

Importantly, the study emphasizes that Japan is not trying to “beat China at its own game.” Instead, it seeks to reduce exposure while remaining embedded in a multipolar supply system.

Deep-Sea Mining: Strategic Option, Not a Silver Bullet

One of the more controversial aspects examined is Japan’s interest in deep-sea rare–earth–rich mud near Minamitorishima Island. Geologically, these deposits are exceptional and could theoretically supply decades of Japan’s heavy rare earth needs. However, Wang’s analysis is cautious. Extraction would occur at depths of 5,000–6,000 meters, with high costs, major technical uncertainty, and poorly understood ecological risks.

The study concludes that deep-sea mining should be viewed as a long-term strategic buffer, not a near-term replacement for Chinese supply. Even in the most ambitious scenario, deep-sea output would likely meet only 1–5% of Japan’s demand by the mid-2030s.

Implications: Lessons for the U.S., Europe, and Allies

For other resource-poor industrial economies—including the EU, South Korea, and parts of North America—the implications are sobering but constructive. The study suggests that trying to replicate China’s scale is unrealistic and unnecessary.

Greater resilience comes from:

• Diversifying suppliers rather than seeking total independence
• Reducing rare earth intensity through better design
• Expanding recycling and circular supply chains
• Competing on standards, reliability, and environmental performance rather than sheer volume

This aligns with REEx’s ongoing coverage of alliance-based strategies such as the emerging “Pax Silica” framework, where processing, technology, and governance—not raw ore—define power.

Limitations and Open Questions

The paper is explicit about its limits. It relies on publicly available datasets, many of which depend on Chinese reporting that is difficult to independently verify. Cost and environmental data for deep-sea mining remain speculative, and the scenario analysis cannot fully capture geopolitical shocks, technological breakthroughs, or sudden policy shifts. The study also focuses primarily on Japan and China, leaving U.S. and EU strategies less deeply explored.

Conclusion

Wang’s analysis delivers a clear message: China’s monopoly over rare earth processing is real and enduring—but it is not an absolute destiny. Japan’s experience shows that smart diversification, technology leadership, and governance can materially reduce risk without chasing an unattainable goal of self-sufficiency. For policymakers and investors alike, the lesson is straightforward: in rare earths, resilience comes not from digging more, but from thinking smarter.

Source: Wang, Q. Nature-positive rare earth governance: Japan’s strategy in a China-dominated system (SSRN preprint, 2025).

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