Why Mining More Rare Earths Won’t Fix America’s Supply Problem

Mountain Pass, California hosts one of the largest rare earth mines on the planet, operated by MP Materials and capable of producing thousands of tonnes of rare earth concentrate each year. Yet the United States still cannot independently manufacture the permanent magnets its own fighter jets require. The mine is not the problem.

A wave of federal investment, policy attention, and investor interest has focused on rare earth mining as the answer to U.S. supply chain vulnerability. That framing misidentifies where the bottleneck sits. Ore is only the first step in a five-stage industrial chain, and the United States remains largely absent from the four steps that follow. Most domestic rare earth concentrate has historically been shipped to China for the separation, refining, metallisation, alloying, and magnet manufacturing that turn raw rock into a usable defence and industrial input.

What follows explains exactly where the U.S. rare earth processing supply chain breaks down, why heavy rare earths like dysprosium and terbium represent the sharpest point of exposure, and why the midstream, not the mine, is where both strategic resilience and investment value concentrate.

The mining-equals-supply-security myth

The instinct to equate mining output with supply security is understandable. MP Materials’ Mountain Pass operation is the sole large-scale rare earth mine currently active in the United States and ranks among the world’s biggest producers of light rare earth elements, specifically neodymium and praseodymium (NdPr). On paper, domestic production is real and growing.

The problem is what happens next. Ore leaving a mine is a raw material, not a usable industrial input. Between the mine and a finished permanent magnet sit four additional transformation stages, each requiring separate capital, chemistry, and industrial infrastructure. The full rare earth value chain runs through five distinct links:

• Mining: Extracting ore from the ground
• Separation and refining: Converting mixed concentrates into individual rare earth oxides
• Metallisation: Reducing oxides to metals
• Alloying: Producing NdFeB (neodymium-iron-boron) and related alloys
• Magnet manufacturing: Sintering, pressing, and machining alloys into finished magnets

Most U.S. rare earth ore has historically been exported to China for processing, precisely because domestic capacity across stages two through five is minimal.

What the U.S. has and what it lacks

The United States has viable ore deposits and is increasing production at the mine level, positioning this as the one link in the chain that is genuinely progressing. Separation, metallisation, alloying, and magnet manufacturing remain largely offshore. The four post-mining stages are where the supply chain fractures, and where China’s industrial dominance is most entrenched.

How rare earth processing actually works: the three stages China controls

Ore coming out of the ground looks nothing like a magnet. It is a mixed mineral concentrate containing dozens of elements that must be isolated, converted, and assembled through three distinct midstream stages before becoming a deployable product.

Separation and refining is the first transformation. Mixed concentrates are processed through solvent extraction chemistry, a series of chemical baths that isolate individual rare earth oxides from one another. This requires industrial-scale chemical infrastructure, including specialised reagents, waste treatment systems, and operational expertise, that is largely absent in the United States.

Metallisation is the second stage. Individual oxides must be reduced to metals through high-temperature chemical or electrochemical processes. This industrial capability has largely disappeared outside China since the 1990s, when cost pressures, environmental regulations, and competitive dynamics pushed Western operators out of the market.

Alloying and magnet manufacturing is the final transformation. NdFeB alloys are produced, then sintered, pressed, and machined into finished permanent magnets. This is where the material becomes a product that defence contractors, automakers, and industrial firms can actually purchase.

China holds approximately 85-95% of global capacity across refining, separation, and magnet production as of 2026. The U.S. allowed most of this capacity to migrate to China in the 1990s and 2000s due to cost, environmental, and regulatory pressures.

USGS Mineral Commodity Summaries on rare earth production and import reliance provide the most comprehensive official data documenting the degree to which domestic consumption depends on Chinese-origin processed material across each stage of the value chain.

Analysts estimate rebuilding U.S. refining and processing capacity could take 10-15 years even under supportive policy, due to permitting complexity, equipment lead times, workforce gaps, and hazardous waste management challenges.

Each stage is a separate industrial system. Federal investment in a single mine or a single magnet facility does not constitute a supply chain.

Why dysprosium and terbium are the sharpest point of exposure

The United States is making genuine progress on light rare earths. Mountain Pass is a bastnäsite deposit rich in neodymium and praseodymium, and MP Materials has developed an SEG+ concentrate that includes some medium and heavy rare earth elements. But the most acute vulnerability is not in the elements the U.S. can increasingly claim to produce. It is in two specific heavy rare earths it cannot yet access or process at scale: dysprosium (Dy) and terbium (Tb).

The difference is functional. Light rare earths like neodymium and praseodymium form the core of NdFeB permanent magnets. Heavy rare earths, specifically dysprosium and terbium, are added to those magnets to maintain magnetic performance at high temperatures and under sustained mechanical stress. Without them, the magnet degrades under the conditions found in the most demanding applications:

• Jet engines requiring thermal stability above 150°C
• Guided munitions with extreme acceleration forces
• Submarine propulsion systems operating under continuous load
• Fighter aircraft avionics and actuation systems
• High-cycle industrial motors in energy and manufacturing

China mines roughly 60-70% of the world’s rare earths overall and refines approximately 85-91%. But for heavy rare earths used in high-performance magnets, the concentration is even more extreme.

China’s control of processing for heavy rare earths used in high-performance magnets is close to 100%.

Much of China’s heavy rare earth supply comes from ionic clay deposits in southern China that have been developed and optimised over decades, representing a structural geographic and industrial advantage with no equivalent outside Chinese borders.

Increased U.S. mining output from Mountain Pass does not address this gap. The SEG+ concentrate is a step, but it is insufficient alone to support large-scale domestic production of high-temperature permanent magnets. The Dy and Tb gap is the specific mechanism by which China’s rare earth position translates into leverage over U.S. defence capability.

Pentagon’s 2027 magnet goal: a mismatch with industrial reality

U.S. law imposes a statutory restriction, effective 1 January 2027, prohibiting Pentagon procurement of specified rare earth magnets from China, Russia, Iran, and North Korea. The Department of Defense has articulated a goal of securing a complete mine-to-magnet supply chain by that date.

The Defense Acquisition Regulations System rules under 10 U.S.C. 4872 codify this restriction with full supply chain scope, explicitly extending the prohibition on neodymium-iron-boron magnets from mining through finished magnet production, not merely the final assembled component.

The numbers suggest the goal will not be met on time.

1. 2025 U.S. NdFeB magnet demand: approximately 48,000 metric tons (indicative estimate)
2. 2025 U.S. domestic magnet production: approximately 300 metric tons (indicative estimate)
3. Projected U.S. domestic magnet capacity by end-2026: approximately 5,000 metric tons (indicative estimate)
4. 2027 DoD requirement: a complete domestic supply chain with no Chinese-origin magnets in specified defence applications

The progression from 300 to 5,000 metric tons represents real growth. It also represents a fraction of what the mandate requires. Even the most optimistic domestic capacity projections leave a gap of tens of thousands of tonnes per year.

Reuters reporting indicates the U.S. government was already weighing, as of mid-2026, whether to extend access to some Chinese rare earth materials beyond the 2027 deadline because domestic capacity would not be sufficient in time.

The Pentagon’s investment and its limits

The Department of Defense’s financial commitment to MP Materials in July 2025 represented the most significant federal intervention in rare earth production in recent decades. The investment was intended to accelerate MP Materials’ Texas magnet manufacturing facility, which targets approximately 1,000 metric tons of initial capacity, with plans to scale further by 2028.

The federal commitment established MP Materials as a recognised anchor for one of the world’s most sensitive supply chains. Yet even with this backing, the broader domestic ecosystem remains incomplete. Separation capacity is limited. Metallisation is embryonic. Heavy rare earth processing is effectively nonexistent. The 2027 target is widely viewed as lagging implementation, and some form of policy extension or emergency exemption appears increasingly likely.

Rare earths beyond defence: industrial and tech sector exposure

The processing bottleneck is not a niche defence procurement problem. It runs through several of the largest sectors in the U.S. economy.

Tesla (NASDAQ: TSLA) relies on NdFeB permanent magnets in a significant portion of its electric vehicle motor designs. When China has introduced export restrictions on processed rare earths in the past, U.S. car plants faced production delays and potential shutdowns. Every EV traction motor using permanent magnet technology carries this supply chain exposure.

GE Aerospace (NYSE: GE) depends on rare earth materials for jet engines that must perform reliably under extreme thermal conditions, making the heavy rare earth processing gap directly relevant to aerospace manufacturing.

Microsoft (NASDAQ: MSFT) is investing heavily in AI data centre infrastructure that requires substantial quantities of electrical equipment and power systems incorporating critical minerals. Rare earth processing availability is becoming a technology infrastructure question, not merely a materials sourcing one.

Apple (NASDAQ: AAPL) relies on rare earth elements across iPhones, Macs, and wearables. Despite expanded recycling programmes and supply chain diversification efforts, domestic processing insufficiency means the supply exposure persists across product categories.

Wind energy and industrial equipment sectors add further demand. High-performance permanent magnets in wind turbines and industrial motors depend on reliable NdPr supply and, for the most demanding applications, dysprosium and terbium.

As U.S. domestic processing capacity expands, a broader range of industrial and technology companies are paying increased attention to the origin of critical materials. Rare earth processing is becoming a cross-sector risk factor that will increasingly appear in earnings calls, supply chain disclosures, and capital allocation decisions.

Securing the midstream: where rare earth value is built

The rare earth value chain has a hierarchy, and it does not place the mine at the top.

• Mining: Necessary but commoditised. The U.S. has viable deposits and is increasing ore production. This is the one stage where genuine domestic progress is visible.
• Midstream processing: The critical bottleneck. Separation, refining, metallisation, and alloying capacity are where China’s position is strongest and where Western supply chains are weakest. This is where ore becomes a usable input.
• Magnet manufacturing: The end-state objective. Finished magnets are what defence contractors, automakers, and industrial firms actually procure. U.S. capacity here remains embryonic relative to demand.
• Heavy rare earth access: The differentiating constraint. Any project or ecosystem that can secure and process dysprosium and terbium will hold a structural advantage that light-rare-earth operations alone cannot replicate.

The U.S. is investing in individual projects, including MP Materials’ Texas facility and other domestic initiatives. What it still lacks is a coordinated industrial ecosystem linking mining, processing, metallisation, and magnet manufacturing under a coherent approach with aligned permitting, finance, workforce development, and long-term offtake planning.

China built its global competitive advantage not at the mine face but in the processing hubs, metallisation plants, and magnet factories that turn ore into capability. Those midstream stages have largely atrophied in North America over three decades. Rebuilding them is estimated to take 10-15 years even under supportive policy conditions.

Mining more ore without building midstream and downstream links leaves the core vulnerability largely untouched. For investors evaluating rare earth opportunities, the processing midstream is where scarcity value, pricing power, and durable competitive advantage concentrate.

America’s rare earth gap will not be closed by geology alone

Asking whether the U.S. has enough rare earth ore is the wrong question. The right question is whether it has enough processing, metallisation, and magnet manufacturing capacity to turn that ore into defence-grade and industrial-grade products. As of mid-2026, it does not.

Progress is real. MP Materials’ Texas facility, the July 2025 Pentagon investment, and growing policy attention all represent genuine steps. But the 2027 mine-to-magnet deadline is widely viewed as lagging, with potential timeline extensions under active consideration. Heavy rare earth processing for high-performance magnets remains close to 100% China-controlled. The coordinated industrial ecosystem needed for true supply chain independence does not yet exist, and the 10-15 year rebuilding estimate means rare earth processing will remain both a structural vulnerability and an investment theme well into the early 2030s.

When the next rare earth announcement lands, the question worth asking is not how much ore is in the ground. It is which of the five supply chain stages the announcement addresses, and whether the midstream, where value is actually built, is any closer to being solved.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Forward-looking statements regarding U.S. rare earth capacity timelines and policy outcomes are subject to change based on industrial, regulatory, and geopolitical developments.