Heavy Rare Earths at the Center of the Modern Economy: Why Processing-not Mining-Defines Global Power

Highlights

• A comprehensive review of 200+ studies explains China's enduring dominance in heavy rare earth processing stems from mastery of complex separation chemistry and decades of infrastructure development, not just mining access.
• Ion-adsorption deposits supply 90% of the world's medium and heavy rare earths, but traditional extraction methods have caused severe environmental damage, including soil degradation and groundwater contamination in southern China.
• Breaking China's heavy rare earth monopoly requires substantial capital investment, long time horizons, and sustained industrial policy—not just opening new mines—as processing capacity remains the principal constraint on global supply diversification.

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A comprehensive new review led by Yilin He (opens in a new tab) and colleagues associated with Institutions involved include Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (opens in a new tab) (State Key Laboratory of Deep Earth Processes and Resources) and University of Chinese Academy of Sciences (opens in a new tab)

published in press in the Journal of Rare Earths (opens in a new tab) (January 2026), offers one of the most detailed syntheses to date of heavy rare earth elements (HREEs)—the scarcest and most strategically important subset of rare earths. While presented primarily as a scientific and environmental assessment, the review implicitly reinforces a critical geopolitical reality: China’s dominance in heavy rare earth processing and separation remains the most consequential choke point in the global rare earth supply chain. Drawing on more than 200 peer-reviewed studies, the authors examine how HREEs form, how they are extracted, the environmental impacts of prevailing mining practices, and what would be required to move toward technically and ecologically sustainable production.

Dr. Yilin He, PhD (Minerology)

Study Methods: A Decade of Science, Synthesized

This paper (opens in a new tab) is a systematic literature review, not an experimental mining study. The authors synthesize more than a decade of global research on ion-adsorption deposits (IADs)—weathered, clay-rich regoliths that supply over 90% of the world’s medium and heavy rare earth elements, including dysprosium, terbium, and yttrium. These elements are indispensable for permanent magnets used in electric vehicles, wind turbines, advanced electronics, and military systems.

The review is organized around four core themes:

• The formation of ion-adsorption HREE deposits through prolonged tropical and subtropical weathering
• The evolution of mining techniques, from early leaching methods to modern in-situ extraction
• Environmental and human health risks associated with rare earth mobilization
• Remediation strategies and pathways toward more sustainable resource use

Key Findings: Why China Still Controls the System

The scientific picture presented is clear—and uncomfortable for Western policymakers. Ion-adsorption deposits are geologically uncommon, slow to form, and difficult to exploit without significant environmental disruption. China identified and industrialized these deposits beginning in the late 1960s and subsequently developed world-leading expertise in separation chemistry, processing, and downstream integration, not merely mining.

A central conclusion running through the review is that processing capacity—not raw ore availability—is the principal constraint on supply diversification. Even where new deposits might be identified outside China, replicating the necessary midstream infrastructure would require long time horizons, substantial capital investment, regulatory alignment, and social license—none of which are assured.

Environmental Costs: The Hidden Price of Dominance

The authors do not minimize the environmental legacy of China’s rare earth industry. Traditional ammonium-based in-situ leaching has caused soil degradation, groundwater contamination, and ecosystem damage, particularly in southern China. Once mobilized, rare earth elements can behave similarly to heavy metals, accumulating in soils and water and posing potential ecological and human health risks.

The review evaluates emerging alternatives such as electrokinetic mining and bioleaching, which show promise in laboratory and pilot settings but face substantial challenges in scalability, cost, and field deployment. These trade-offs help explain how China’s historically permissive environmental framework—now tightening—contributed to its early and durable dominance.

Implications for Global Supply Chains

For investors and policymakers, the implications are sobering. The review reinforces that diversifying heavy rare earth supply is not simply a matter of opening new mines. It requires mastery of complex separation chemistry, long-term environmental management, and sustained industrial coordination. While deep-sea rare–earth–rich muds are discussed as a potential future source, the authors acknowledge unresolved technological, environmental, and regulatory barriers that currently limit commercial viability.

Rare Earth Exchanges™ suggests that taken together, the findings help explain why China’s leverage persists—and why export controls remain such an effective policy instrument.

Limitations and Contextual Gaps

As a review authored entirely by China-based researchers and funded by Chinese state science programs, the paper does not directly address geopolitical risk, industrial policy competition, or the strategic weaponization of supply chains. Environmental impacts outside China receive limited attention, and alternative processing ecosystems in the United States, Europe, and Australia are not examined in depth.

Nonetheless, the scientific conclusions themselves are robust and difficult to dismiss, which is precisely what makes their broader implications so consequential.

The Science Explains the Monopoly

This study does not advocate Chinese dominance—but it helps explain it. By detailing the geological scarcity, technical complexity, and environmental trade-offs inherent to heavy rare earth production, the authors inadvertently underscore why China’s position remains structurally entrenched. For the rest of the world, the message is clear: as Rare Earth Exchanges has continuously reported, breaking this monopoly will require time, capital, environmental realism, and sustained industrial policy—not rhetoric alone.

Citation: He, Y. et al. “Heavy rare earth elements: Critical resources, environmental challenges and pathways to sustainability.” Journal of Rare Earths, In Press (2026). https://doi.org/10.1016/j.jre.2026.01.016 (opens in a new tab)