During the 1990s, rare earth mining and processing expanded rapidly in China, helped by lower costs and looser environmental rules. As China’s output grew, other producers—including the United States—lost market share, setting up a more geographically concentrated supply chain. This shift mattered because rare earths are key inputs for permanent magnets and many electronics.
China began using export quotas for rare earth products, adding a new policy lever over global supply. Over time, quotas became part of a broader set of export controls (such as taxes and licensing) that affected prices and availability outside China. These policies increased the strategic importance of “midstream” capacity like chemical separation and refining.
The Mountain Pass mine—long a major U.S. source of rare earth ore—had its mining operations suspended amid weak prices and operational challenges. With U.S. production declining, more of the supply chain shifted overseas, especially toward China-based processing. This reduced U.S. ability to supply its own manufacturers with rare earth inputs.
In a major shock to downstream industries, reports indicated that Chinese customs halted rare earth shipments to Japan during a diplomatic dispute. The episode highlighted how concentrated supply could become a geopolitical risk, especially for manufacturers dependent on steady inputs for electronics and vehicle components. It also pushed governments and firms to look harder at stockpiles, diversification, and recycling.
The U.S. Department of Energy released a strategy report focused on materials risks for clean-energy technologies, including rare earth elements. The report helped frame critical minerals as an energy-security issue, not only a mining issue. It also encouraged research into substitutes, recycling, and more resilient supply chains.
The United States, European Union, and Japan challenged China’s export restrictions on rare earths and related materials at the World Trade Organization. The dispute mattered because it tested whether export quotas and duties could be justified under WTO rules when they also affected downstream industrial competitiveness. It also signaled that supply-chain policy had become a central trade issue.
Molycorp, the owner of Mountain Pass, filed for bankruptcy, and the site was idled. This reinforced a key lesson for critical minerals policy: mining and processing can be vulnerable to boom-and-bust pricing and strong foreign competition. The shutdown left the U.S. with very limited domestic rare earth production capacity for a period.
After WTO panel and appellate findings, China removed export duties and export quotas for rare earths, tungsten, and molybdenum that were found inconsistent with WTO rules. Even with formal quotas removed, the episode showed that administrative controls and industrial policy can still shape supply chains. The ruling became a reference point for later debates about “de-risking” and trade remedies.
A new ownership group acquired Mountain Pass from the Molycorp estate, creating the foundation for MP Materials. The acquisition aimed to restart U.S. rare earth mining and rebuild parts of the domestic supply chain. This was an important transition from a dormant asset to a company structured around re-entering global markets.
The U.S. Department of the Interior finalized a list of 35 critical minerals, based on U.S. Geological Survey analysis and public comments. The list helped agencies prioritize supply-chain vulnerabilities and focus policy work on minerals important to the economy and national security. It also set a precedent for updating the list as markets and risks change.
The International Energy Agency published a major report explaining how clean-energy technologies depend on minerals such as lithium, cobalt, graphite, and rare earths. It highlighted that mining, processing, and refining can be concentrated in a few countries, increasing disruption risk. This helped push critical minerals from a niche concern into mainstream energy planning.
The U.S. Geological Survey released an updated list of 50 critical mineral commodities, reflecting a revised methodology and changing supply risks. Compared with 2018, the update expanded coverage and treated some mineral groups (including rare earths) with more detail. This update reinforced the idea that “criticality” is dynamic and needs periodic review.
U.S. implementation guidance for the Inflation Reduction Act set rising thresholds for how much of an EV battery’s critical minerals must be sourced from the U.S. or free-trade partners (or recycled in North America). It also introduced restrictions tied to “foreign entities of concern,” tightening supply-chain requirements over time. This policy directly connected consumer incentives to upstream mining and processing decisions.
The European Commission presented its proposal for a Critical Raw Materials Act to strengthen EU access to key inputs for green and digital technologies. The proposal emphasized increasing domestic capacity, improving recycling, and diversifying imports. It marked a policy turn toward treating raw materials as a strategic supply-chain issue across the EU.
EU member states, through the Council, agreed on a negotiating position for the Critical Raw Materials Act. The Council highlighted targets for extraction, processing, and recycling inside the EU and limits on dependence on any single third country for strategic materials. This step moved the proposal toward final law, signaling stronger industrial-policy coordination.
The EU adopted Regulation (EU) 2024/1252, establishing a framework to secure and sustainably supply critical raw materials. It formalized EU lists of strategic and critical raw materials and created tools to speed up projects and manage supply risk. The law is a key endpoint in this period because it turns years of supply-chain concern into a lasting regulatory framework.
Critical Minerals and Rare Earths Supply Chains (1990–2025)