Light Rare Earths: The Metals Inside Every EV, Wind Turbine and Weapon System — And Why the West Barely Produces Them

Most people have heard the term rare earths, let alone "light rare earths". Far fewer understand what they actually are, what they do, or why governments are treating them as a national security emergency.

What are light rare earths?

Rare earth elements are a group of 17 metals that share similar chemical properties. They split into two families — light and heavy — based on atomic weight. Light rare earths are the more abundant of the two and include:

Neodymium and Praseodymium (NdPr) — by far the most strategically important. Combined into an oxide and used to make neodymium-iron-boron permanent magnets — the strongest permanent magnets known to science. Every serious electric motor, wind turbine generator, EV drivetrain, military drone, robot actuator and missile guidance system depends on them. An average EV traction motor contains roughly 5 kilograms of NdPr.

Lanthanum — used in petroleum refining catalysts, camera and telescope lenses, and hydrogen storage alloys. High volume, relatively low price.

Cerium — the most abundant rare earth. Used in glass polishing compounds, catalytic converters, UV-filtering glass and phosphors. Produced in enormous quantities as a byproduct of neodymium mining.

Samarium — used in samarium-cobalt magnets that outperform NdFeB magnets in extreme heat. Critical for aerospace, missile systems and high-temperature defence applications where ordinary magnets fail.

Europium and Gadolinium — used in display phosphors, MRI contrast agents and nuclear reactor control rods.

Where do they come from?

Light rare earths are geologically more widespread than heavy rare earths — the deposits exist on every continent. The problem has never been geology. It has always been processing.

The major sources are China's Bayan Obo deposit in Inner Mongolia — the world's largest rare earth deposit by a significant margin, predominantly rich in light REEs — alongside deposits in the United States at Mountain Pass California, Australia's Mount Weld in Western Australia, Brazil, India, Greenland and increasingly Norway, which has recently identified Europe's largest known rare earth deposit.

On paper that sounds like a diversified supply base. In practice it isn't, because almost all of it gets processed in China.

Where are they processed — and why that's the real problem

Mining rare earth ore is only step one. The material then has to be concentrated, chemically separated, refined into oxides, reduced to metals, alloyed and eventually manufactured into magnets. Each step requires specialised infrastructure and decades of accumulated process knowledge.

China refines approximately 85% of the world's light rare earths and controls around 90% of global NdFeB magnet manufacturing. Even ore mined in Australia or the United States has historically been shipped to China for processing — meaning Western countries have been dependent on Chinese refining even for material pulled from their own ground.

China's dominance was built not on irreplaceable technology but on decades of absorbing environmental costs that Western producers legally cannot avoid. Rare earth refining produces acidic wastewater, heavy metals and radioactive byproducts. The hidden subsidy behind thirty years of cheap Chinese rare earths is the environmental damage offloaded onto communities in Jiangxi and Inner Mongolia.

Why it matters right now

Demand for NdPr is forecast to grow at roughly 8.5% annually through 2030 driven by EVs, wind energy, defence spending and the robotics and AI hardware buildout. Every humanoid robot, every military drone, every offshore wind turbine requires permanent magnets. There is no substitute at scale.

Meanwhile China demonstrated in 2025 that it is willing to use this supply chain as a geopolitical weapon. Export controls introduced in April 2025 caused rare earth magnet exports to plunge more than 74% year over year in May 2025. European buyers faced prices up to six times Chinese domestic levels. Factories in the US, Europe and Asia cut production or temporarily shut down waiting for supply.

The US government has responded by taking a $400 million equity stake in MP Materials — the owner of Mountain Pass — establishing a price floor for NdPr to prevent China from flooding the market to kill Western producers, and committing to buy 100% of the magnets MP produces. Australia's Lynas is expanding NdPr production capacity significantly. Europe has committed €3 billion to build out processing and recycling infrastructure.

These are meaningful steps. They are also operating against a thirty-year head start.

The bottom line

Light rare earths — and NdPr specifically — sit at the intersection of electrification, defence modernisation and the AI hardware buildout. The supply chain runs almost entirely through China. The West spent three decades outsourcing it for the sake of low prices and is now paying the strategic cost of that decision.

The rebuild is underway. It will take most of a decade to matter at scale.