90% of rare earth refining is controlled by China, posing a hardware bottleneck for U.S. humanoid robot mass production
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90% of rare earth refining is controlled by China, posing a hardware bottleneck for U.S. humanoid robot mass production
China controls the U.S. robotics hardware supply chain.
Navigating Web3 tides with focused insightsAuthor: Serenity
Translated by TechFlow
TechFlow Intro: All discussions about the robotics revolution focus on AI and software—but this tweet highlights a far more fundamental structural risk: China controls 70% of global rare earth mining, 85–90% of global rare earth refining and separation capacity, and over 90% of rare earth magnet manufacturing.
The joints and actuators of humanoid robots like Optimus rely entirely on suppliers from China or Japan; the U.S. retains only the “brain.”
Using specific material lists and Morgan Stanley’s demand forecasts, the author quantifies the impact on rare earth reserves in an era of one billion humanoid robots.
Full Text Below:
The United States is losing the robotics and humanoid robot race against China.
Software and AI constitute only half the battlefield.
China holds a kill switch over U.S. robotics hardware supply chains—because the U.S. cannot mass-produce the materials required for humanoid robots at reasonable cost.
Once China flips that “kill switch,” the entire U.S. robotics build-out slows—because China dominates control over the “body” (actuators, gearboxes, metallurgy) and the raw materials needed to manufacture humanoid robots.
Accordingly, U.S. robotics companies have already signed contracts with Chinese manufacturers to procure all humanoid robot components, enabling assembly of products like Optimus at sufficiently low cost—while attempting to keep the “brain” in the U.S.
Consider all top-tier robotics transmission/motion suppliers: none are American:
- Leaderdrive (China): Harmonic drive gearboxes
- Harmonic Drive (Japan): Harmonic drive gearboxes
- Nabtesco (Japan): RV gearboxes
- Sanhua Intelligent (China): Linear actuator assemblies
- Shuanghuan Transmission (China): RV gearboxes/gears
- Shenzhen Inovance Technology (China): Servo systems/ball screws
This stems from one core reason:
China currently controls nearly 70% of global rare earth mining—and, more critically, commands 85–90% of global rare earth refining and separation capacity, as well as over 90% of finished rare earth magnet production.
Thus, the greatest threat is that Chinese export controls pose a structural overhang on U.S. robotics projects.
Beijing has already demonstrated its willingness to weaponize this monopoly—Japan experienced similar circumstances.
To break dependence on robotics and Optimus supply chains—and ensure the robotics revolution continues domestically—Western capital must flow to companies rebuilding the rare earth ecosystem, covering:
- Upstream mining
- Midstream separation/metallization
- Downstream magnet manufacturing
If the global humanoid robot population reaches one billion units by 2050—the base-case scenario in Morgan Stanley’s model—it will require approximately 400,000 tonnes of neodymium, 80,000 tonnes of dysprosium, and 16,000 tonnes of terbium. This would consume roughly 15% of known global neodymium reserves, 25% of global dysprosium reserves, and 30% of global terbium reserves—a massive demand shock.
In short: China controls the U.S. robotics hardware supply chain.
This is a historic moment when the U.S. must invest to secure its own supply chains—and win the robotics race against China.
The crux lies in rare earths: they are a prerequisite for producing humanoid robot hardware at competitive prices.
The following are priority areas for the U.S. government:
1. Magnet Metals (for frameless torque motors)
Neodymium (Nd) and praseodymium (Pr): These “light rare earths” are core constituents of NdFeB magnets.
Dysprosium (Dy) and terbium (Tb): Rare earth elements alloyed into magnets.
Samarium (Sm) and cobalt (Co): Used to manufacture SmCo magnets.
Boron (B) and iron (Fe): Critical stabilizing elements, comprising ~1% of NdFeB magnet weight.
2. Structural Metallurgy (for harmonic drives and planetary roller screws)
Titanium (Ti), vanadium (V), and molybdenum (Mo): Used in gears of harmonic drives and threaded shafts of planetary roller screws.
Niobium (Nb), chromium (Cr), nickel (Ni), and manganese (Mn): Key microalloying elements added to structural steels to enhance toughness, prevent corrosion, and significantly reduce robotic joint weight.
Cerium (Ce) and lanthanum (La): Prevent premature failure of robotic gears.
3. Compute, Perception & Power (“Brain,” “Eyes,” and Battery)
Gallium (Ga) and germanium (Ge): Essential for advanced semiconductors, LiDAR systems, and high-frequency communication chips.
Lithium (Li), graphite (C), and copper: A full-size humanoid robot requires ~2 kg lithium, ~3 kg graphite, and up to 6.5 kg copper.
Key Company List
The most critical U.S. companies ensuring the above capabilities:
1. Magnet metals (Nd, Pr, Dy, Tb, Sm, Gd):
$UUUU, $MP, $ALOY, $USAR, $LYSDY (Lynas Rare Earths), $NEO (Toronto Stock Exchange), $ILU, $ARU (ASX)
2. Structural metallurgy (niobium, vanadium, titanium, beryllium):
$ATI, $CRS, $FCX, $NB, $MTRN, $LGO
3. Compute, perception & power (gallium, germanium, graphite, battery metals):
$BMM, $VNP, $TECK, $ALB, $EAF, $ALTM, $SYR, $FCX, $AW1 (ASX)
Take a robotic joint as an example: it is a permanent-magnet motor requiring a neodymium processing supply chain:
1. Neo Performance Materials (TSX: NEO)
2. $MP
3. $UUUU—processes monazite concentrate into NdPr oxides
The U.S. government should systematically map the bill of materials (BOM) for every robotics supply chain—and then aggressively invest to secure domestic raw material processing capacity.
Currently, the transmission systems required for humanoid robots—and the global infrastructure needed to produce those components—are highly concentrated in China.
The U.S. is extremely vulnerable in physical robotics supply chains; securing domestic metal and midstream processing capability is essential to competing with China.
The U.S. must increase investment in critical materials supply chains today—to maintain long-term leadership in the robotics industry.
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