Six elements — platinum, palladium, rhodium, iridium, ruthenium, and osmium — sit together on the periodic table, occur together in the same ore bodies, are mined together, refined together, and share a set of physical properties that make them collectively irreplaceable in modern industrial chemistry: they catalyze reactions at extreme temperatures without degrading, resist corrosion under conditions that destroy other metals, and can be recycled to 99.95% purity indefinitely. They are the platinum group metals — PGMs — and their defining characteristic in the context of this course is that roughly 80% of global platinum, 40% of palladium, and over 80% of rhodium and iridium come from a geological formation in South Africa called the Bushveld Complex, a two-billion-year-old igneous intrusion covering 66,000 square kilometers — an area the size of Sri Lanka — that contains the largest PGM reserves on Earth. Russia’s Norilsk Nickel is the other major producer, accounting for approximately 40% of global palladium and 10% of platinum. Together, South Africa and Russia supply the overwhelming majority of PGMs consumed by the global automotive, chemical, petroleum refining, and emerging hydrogen industries. The supply chain concentration pattern is familiar from every other lecture in this course. What makes PGMs different is that the concentration isn’t in China — it’s in a country with rolling electrical blackouts and a country under Western sanctions for invading Ukraine.

What they’re inside

The single largest demand sector for PGMs is the catalytic converter — the device bolted into the exhaust system of essentially every internal combustion engine vehicle sold since the 1970s. Platinum, palladium, and rhodium catalyze the conversion of carbon monoxide, unburned hydrocarbons, and nitrogen oxides into carbon dioxide, water, and nitrogen gas. A typical catalytic converter contains 3 to 7 grams of PGMs. Over 55% of total global PGM demand comes from automotive catalyst applications. Palladium dominates gasoline catalysts. Platinum dominates diesel catalysts. Rhodium is required in both and is the most valuable of the three — a single troy ounce of rhodium traded above $29,000 in 2021 before collapsing to roughly $5,000 by 2024 as automotive production normalized.

The second-largest demand sector is industrial catalysis — petroleum refining, chemical manufacturing, glass production, and electronics. Platinum and palladium catalyze cracking, reforming, and hydrogenation reactions in oil refineries. Ruthenium shows up in hard disk drive platters. Iridium appears in spark plugs, crucibles for growing single-crystal sapphire for LED substrates, and — increasingly — in the catalysts for proton exchange membrane water electrolyzers that produce green hydrogen.

The third sector is jewelry — roughly 29% of demand — where platinum’s density, luster, and hypoallergenic properties make it the prestige metal for rings and watches, particularly in China and Japan.

The fourth, and the one that will determine PGM demand in 2035 and beyond, is the hydrogen economy. Proton exchange membrane fuel cells — the type used in fuel cell electric vehicles from Toyota, Hyundai, and others — use platinum catalysts at both the anode and cathode. A typical fuel cell vehicle contains 50 to 80 grams of platinum, roughly 10 to 25 times more PGM than a catalytic converter. The target is to reduce PGM loading to 10-20 grams per vehicle, which would still be 2-8 times more than a catalytic converter. PEM electrolyzers — the machines that split water into hydrogen and oxygen using electricity — require both platinum and iridium catalysts. If the hydrogen economy develops as its proponents expect, PGM demand from fuel cells and electrolyzers could offset or exceed the decline from catalytic converters as internal combustion engines are phased out. That is a very large “if,” and the fusion companies and the vanadium flow battery developers are betting on alternative pathways for grid power and storage that would reduce the urgency of the hydrogen transition.

The supply problem

Platinum mine supply hit its lowest level in five years in 2025 — 5.51 million ounces — and the market recorded a 692,000-ounce deficit, the third consecutive annual shortfall according to the World Platinum Investment Council. Above-ground inventories have fallen to less than five months of demand coverage. Bank of America raised its 2026 platinum price forecast to approximately $2,450 per ounce.

The deficit is structural rather than cyclical, and the structure has three components. The first is geological decline. South Africa‘s Bushveld Complex mines — operated by Anglo American Platinum (now demerged as Valterra Platinum), Impala Platinum, Sibanye-Stillwater, and Northam Platinum — are among the deepest mines in the world, operating at depths of 1 to 2 kilometers underground. Ore grades are declining. Energy costs are rising. South Africa’s electricity grid, operated by the crisis-plagued Eskom, has subjected the mining sector to years of rolling blackouts (load-shedding) that shut down ventilation, hoisting, and processing operations unpredictably. Mining PGMs in South Africa in the 2020s requires extracting lower-grade ore from deeper underground in a country that cannot reliably keep the lights on. The ARMSCOR post documents a South Africa that could build nuclear weapons in secret; the South Africa that mines PGMs today cannot maintain its electrical grid.

The second is Russian uncertainty. Russia’s Norilsk Nickel produces palladium primarily as a by-product of nickel and copper mining. Western sanctions following the 2022 invasion of Ukraine have not directly targeted PGM exports — the automotive and chemical industries lobbied against it, and Europe’s dependence on Russian palladium was too acute to sever cleanly. But the sanctions environment creates persistent uncertainty: insurance, shipping, and banking complications make Russian PGM supply less reliable even when it’s technically legal to purchase. The antimony and gallium/germanium experiences demonstrate what happens when a concentrated supplier decides to restrict exports. Russia hasn’t restricted PGM exports. The sanctions regime makes continued supply a political decision rather than a commercial certainty.

The third is iridium scarcity. Iridium is the rarest of the PGMs, produced at approximately 7-8 tonnes per year — exclusively as a by-product of platinum mining, with 80-95% of production in South Africa. There is no primary iridium mine. There is no way to produce more iridium without producing more platinum from the Bushveld Complex. If PEM electrolyzer deployment scales to meet green hydrogen production targets, iridium demand could exceed supply within a decade. The element is so rare and so concentrated that it may represent the single tightest bottleneck in the entire hydrogen economy — tighter than the lithium bottleneck, tighter than the copper bottleneck, because at least lithium and copper have multiple producing countries and expansion-stage projects. Iridium has South Africa and essentially nothing else.

The recycling success story

PGM recycling is the one area where the critical minerals recycling story is actually working. Between 21% and 34% of global PGM demand is now satisfied by secondary supply — metals recovered from spent catalytic converters, electronic waste, and industrial process catalysts. Players including Umicore, Johnson Matthey, DOWA, and Tanaka Precious Metals achieve recovery purities above 99.95% using high-temperature smelting, hydrometallurgy, solvent extraction, and selective precipitation. Spent automotive catalysts are expected to provide 71% of all recycled PGMs in 2026, up from 50% in 2010. PGM recycling uses approximately 10 times less energy than primary mining per troy ounce recovered.

The recycling infrastructure works because PGMs are valuable enough to justify the collection and processing costs — a single catalytic converter contains $100-$500 worth of PGMs at current prices, creating a robust scrap market and, inevitably, a catalytic converter theft epidemic that costs vehicle owners roughly $1 billion per year in the United States alone. The economic incentive that makes recycling viable also makes theft viable. That’s a supply chain operating as designed, if you define “designed” generously.

The longer-term recycling story depends on what replaces catalytic converters. If the automotive fleet transitions to battery EVs, the wave of catalytic converter scrap will peak in the 2030s as the installed fleet of ICE vehicles ages out, and then decline. If fuel cell vehicles gain market share, their higher PGM loading per vehicle will generate a new recycling stream — but with a 12-to-15-year lag between vehicle sale and vehicle scrapping. The graphite and lithium recycling infrastructures are being built to handle the battery waste stream that will follow the EV transition. The PGM recycling infrastructure is already built. The question is whether it will have enough feedstock.

Why it’s Lecture 36

Platinum group metals are the final lecture of the Rare Earth Elements course because they are the capstone case study: a class of metals that is genuinely irreplaceable in current applications, produced from a geological formation that exists essentially nowhere else on Earth, in a country whose infrastructure is deteriorating, alongside a co-producer under international sanctions. The substitution research has been ongoing for 50 years. No viable alternative has emerged for high-temperature catalysis. The hydrogen economy — the clean energy pathway that is supposed to complement batteries and grid-scale storage — depends on platinum and iridium catalysts whose supply is controlled by the same concentrated source. The recycling infrastructure works but is dependent on a fleet of internal combustion engine vehicles that the energy transition is designed to eliminate.

Every tension the course has taught — geological concentration, processing concentration, substitution difficulty, geopolitical risk, the timescale mismatch between supply and demand, the gap between legislation and operational capacity — converges on PGMs. The semiconductor supply chain has TSMC in Taiwan. Lithium has Chinese refining. Antimony has Chinese mining. PGMs have the Bushveld Complex — 66,000 square kilometers of two-billion-year-old magma, 1-2 kilometers underground, in a country where the electricity doesn’t always work. That’s the supply chain the hydrogen economy is built on. The course ends here because this is where all the threads meet.

This is the kind of supply chain our Rare Earth Elements course was built to map — where six metals that share an ore body share a chokepoint, the chokepoint is a geological formation the size of a country, and the question that will determine whether the hydrogen economy is viable is whether South Africa can keep its mines running and its electricity on at the same time.

Lithium carbonate prices nearly doubled between early December 2025 and late January 2026 — rising from roughly $13,400 per metric ton to $26,278, a 95% increase in under two months. If that volatility sounds familiar, it should. In 2022, lithium carbonate traded above $80,000 per metric ton as EV demand outran supply. By late 2023, it had crashed below $10,000 as new Australian hard-rock mines came online, Chinese lepidolite production surged, and downstream battery manufacturers burned through stockpiles they’d panic-bought at the top. By mid-2024, the market looked oversupplied. Then CATL’s Jianxiawo lepidolite mine in China hit delays. Zimbabwe suspended exports of raw lithium concentrates in February 2026, accelerating a ban that had been scheduled for 2027. Maintenance shutdowns hit multiple producers simultaneously. Speculative buying amplified the move. And lithium — the element whose price chart looks like a heart monitor during a cardiac event — was back above $26,000 before most analysts had finished publishing their “lithium surplus” forecasts from the quarter before. The fundamentals haven’t changed. Global EV sales rose 22% in 2025. Lithium-ion battery demand is forecast to grow at a 14% compound annual growth rate over the next decade. Every phone, every laptop, every EV, every grid-scale battery installation on the planet requires lithium. The planet produces roughly 180,000 metric tons of lithium carbonate equivalent per year. The planet needs more. Whether the planet can produce more fast enough, from mines that take 7-10 years to permit and build, is the question the entire critical minerals supply chain depends on.

How lithium gets out of the ground

There are two established methods and one emerging method, and the tension between them defines the supply chain’s economics.

Hard-rock mining is the fast option. Australia — which accounts for over half of global mined lithium — extracts spodumene ore from open-pit mines, primarily in the Pilbara region. The ore is crushed, concentrated through froth flotation, and then chemically converted into lithium carbonate or lithium hydroxide at processing facilities that are, overwhelmingly, located in China. The advantage of hard rock is speed: a mine can ramp production in months rather than years, and output isn’t weather-dependent. The disadvantage is cost — hard-rock processing is energy-intensive, and the spodumene concentrate needs to be shipped across an ocean to Chinese refineries that control the conversion step. When lithium prices crashed in 2023-2024, Australian producers operating at the higher end of the cost curve shut down or curtailed production. When prices rebounded, they restarted. The boom-bust cycle is the business model.

Brine extraction is the cheap option — but slow. The Lithium Triangle — spanning Argentina’s Salta and Jujuy provinces, Chile’s Atacama Desert, and Bolivia’s Salar de Uyuni — contains roughly 60% of the world’s identified lithium reserves in the form of lithium-rich groundwater beneath salt flats. Conventional brine mining pumps this groundwater to the surface and spreads it across massive evaporation ponds where it sits for 12 to 24 months while the sun concentrates the lithium content. Recovery rates are 40-60%. The process requires vast tracts of land, specific climatic conditions (hot, dry, windy), and enormous volumes of water in regions that are already among the driest on Earth. Chile’s SQM and Albemarle operate the world’s largest brine operations in the Atacama. Argentina is the fastest-growing brine producer. Bolivia — which has the largest single lithium deposit in the world at the Salar de Uyuni — has produced almost nothing, because the salt flat’s magnesium-to-lithium ratio is too high for conventional evaporation, the government insists on state control of extraction, and the infrastructure doesn’t exist.

Direct lithium extraction — DLE — is the technology that could change the equation. Instead of waiting 12-24 months for the sun to do the work, DLE uses chemical or physical processes — adsorption, ion exchange, solvent extraction, membranes, or electrochemical methods — to pull lithium out of brine in hours or days, with recovery rates above 80-90%. DLE can work on brines too dilute or too contaminated for evaporation ponds, including geothermal brines in Europe and oilfield brines in the United States, which would open entirely new lithium-producing regions. The technology exists. Adsorption DLE is commercially proven in Argentina and China. Ion exchange systems from companies like Lilac Solutions and Standard Lithium are in advanced development. What hasn’t been proven is whether DLE works at the scale the market needs, at the cost the market can absorb, across the full range of brine chemistries the world’s lithium deposits present. DLE is the fusion energy of the lithium industry — the technology that could solve the supply problem, if the engineering catches up to the chemistry.

The refining chokepoint

The part of the lithium supply chain that most coverage skips is the part that matters most: refining. Australia mines spodumene. Chile and Argentina pump brine. But the conversion of raw lithium into battery-grade lithium carbonate and lithium hydroxide — the chemical products that actually go into battery cathodes — happens overwhelmingly in China. Chinese facilities process the majority of the world’s lithium into battery-grade material because China invested in the refining infrastructure decades before the rest of the world recognized lithium as a strategic material. The pattern is identical to what our Rare Earth Elements course documents across gallium, graphite, antimony, and the rare earths themselves: you can mine the mineral anywhere, but if the refining capacity is concentrated in one country, the mine doesn’t solve the dependency.

Australia’s Pilbara spodumene is shipped to Chinese ports, refined in Chinese facilities, incorporated into cathodes at Chinese battery factories, and then exported — as finished batteries or battery cells — to automakers in Europe, Japan, South Korea, and the United States. The CHIPS Act and the Inflation Reduction Act both include provisions designed to incentivize domestic and allied-nation refining capacity. Albemarle is building a lithium hydroxide conversion plant in Australia. SQM and Codelco are developing lithium processing capacity in Chile under the country’s National Lithium Strategy, which requires that value-added processing happen domestically rather than shipping raw brine to China. The European Union’s Critical Raw Materials Act targets 40% domestic processing of strategic materials by 2030. All of these timelines assume permitting, construction, and commissioning schedules that the critical minerals industry has historically missed. The gap between “legislation passed” and “refinery operational” is measured in years. The market needs the refinery now.

The price chart as diagnostic

Lithium’s price action tells you something that no industry report will say directly: the market doesn’t know how to price this material. The 2022 spike to $80,000 was driven by genuine scarcity — demand outran supply and everyone panicked. The 2023 crash to $10,000 was driven by supply response — Australian mines expanded, Chinese lepidolite production surged, and stockpile-destocking flooded the spot market. The late-2025 rebound to $26,000 was driven by the supply disruptions and speculative positioning that always follow a price crash, because the mines that shut down during the bust take time to restart and the new mines that were supposed to fill the gap haven’t been built yet.

The structural issue is that lithium is caught between two timescales. Demand grows at 12-14% per year, compounding predictably because EV adoption curves and grid storage deployment are policy-driven and structurally irreversible. Supply responds on a 7-to-10-year cycle, because mines take that long to permit, finance, construct, commission, and ramp. Battery manufacturers need to sign offtake agreements 3-5 years in advance to secure material. Miners need price certainty to justify the capital expenditure. Neither side can give the other what it needs, so the price oscillates between “too expensive to buy” and “too cheap to mine,” and the companies in the middle — the battery manufacturers, the automakers, the grid storage developers — absorb the volatility as a cost of doing business.

The vanadium flow battery industry’s leasing model was invented partly to manage exactly this kind of commodity price volatility. The copper shortage creates a different but parallel constraint — a material the energy transition needs in quantities the mining industry cannot produce fast enough. The semiconductor supply chain demonstrated in 2020-2022 what happens when a concentrated supply chain meets a demand shock. Lithium’s version of that demonstration plays out in slow motion, over years rather than quarters, because mines are slower to build than fabs — but the structural logic is identical.

What lithium is actually inside

The chemistry matters because not all lithium demand is created equal. Lithium-ion batteries come in several cathode chemistries, and the chemistry determines how much lithium goes in.

NMC (nickel-manganese-cobalt) cathodes use lithium hydroxide and are the dominant chemistry in European and Korean EVs — higher energy density, longer range, but more expensive and dependent on cobalt and nickel supply chains that carry their own geopolitical and ethical risks. LFP (lithium-iron-phosphate) cathodes use lithium carbonate, contain no cobalt or nickel, are cheaper and safer, and have become the dominant chemistry in Chinese EVs and increasingly in Tesla’s standard-range vehicles. LFP’s rise has shifted the demand mix from lithium hydroxide toward lithium carbonate — which matters because the two products require different refining pathways and different raw material specifications. The irony of LFP’s success as a “cobalt-free” battery chemistry is that it increases lithium intensity per kilowatt-hour while reducing cobalt intensity — trading one supply chain dependency for another.

Beyond batteries: lithium hexafluorophosphate is the dominant electrolyte salt in lithium-ion batteries, and its production is concentrated in China and Japan. Lithium is used in ceramics, glass, lubricating greases, and pharmaceutical applications (lithium carbonate is a mood stabilizer prescribed for bipolar disorder). And — in a detail the fusion companies post mentioned — lithium-6 is a critical material for tritium breeding blankets in deuterium-tritium fusion reactors. If fusion works, the battery supply chain and the fusion supply chain will be competing for the same element. That competition doesn’t exist yet. It might within a decade.

Why it’s Lecture 13

Lithium is the Rare Earth Elements course’s anchor lecture because it is the single most important battery material in the world and the one whose supply chain most clearly illustrates every theme the course teaches: geological concentration (the Lithium Triangle holds 60% of reserves), processing concentration (China dominates refining), extraction technology evolution (DLE may transform the supply economics but hasn’t proven it can scale), price volatility driven by timescale mismatch (demand compounds annually, supply responds on a decade cycle), and the policy response gap (legislation targets 2030, the market needs capacity now).

Every other critical mineral in the course — graphite in the anode, cobalt and nickel in the cathode, copper in the wiring, antimony in the flame retardants that keep the battery pack from burning down the car, vanadium in the grid-scale flow batteries that store the electricity the car charges from — orbits around lithium. The battery is the product. Lithium is the element that makes it possible. And the supply chain that delivers it is a 7-to-10-year engineering problem being asked to solve a 12-to-14% annual demand curve, in a market where the price can double or halve in a single quarter, with refining concentrated in a country that has demonstrated — across gallium, graphite, antimony, and rare earth processing technologies — that it will use export controls when it decides the strategic calculus requires it.

This is the kind of supply chain our Rare Earth Elements course was built to map — where the lightest metal on the periodic table carries the heaviest strategic weight, the price chart looks like a seismograph, and the question that matters most isn’t whether there’s enough lithium in the ground but whether anyone can get it out, refine it, and deliver it fast enough to keep the energy transition on schedule.

On August 14, 2024, China’s Ministry of Commerce announced export controls on six categories of antimony-related products — ore, metals, oxide, and gold-antimony smelting and separation technologies — effective September 15. The stated reason was national security. The actual mechanism was the same one China had used on gallium and germanium the year before: require exporters to apply for dual-use export licenses through the Commerce Ministry, approve the licenses selectively, and let the uncertainty do the work. By December 3, China had escalated to a full ban on antimony exports to U.S. military end users. By July 2025, the price of antimony had hit $59,750 per metric ton — roughly a 4x increase from the $15,000-$18,000 range where it had traded through early 2024. A 55-metric-ton shipment of Australian-mined antimony concentrate, routed through a Chinese port on its way to a U.S. smelter in Mexico, was detained at the port of Ningbo for three months, then returned with broken seals and no explanation. The critical minerals supply chain had absorbed another hit, and most of the industries affected — flame retardants, ammunition, semiconductors, batteries, night vision systems — didn’t have a substitute.

What antimony actually does

Antimony is a metalloid — a silvery-white element that sits between metals and nonmetals on the periodic table — and its defining industrial property is that it makes other things harder, more fire-resistant, and more durable. About half of all antimony consumed globally goes into flame retardants, primarily as antimony trioxide, which is mixed into plastics, textiles, cables, and coatings to prevent or slow combustion. Every upholstered piece of furniture that meets fire safety codes, every cable sheath in a data center, every circuit board housing in consumer electronics — antimony trioxide is in the compound that keeps it from catching fire. The other half splits across applications that are individually smaller but collectively indispensable: hardening lead in ammunition and lead-acid batteries, semiconductor compounds, infrared sensors, precision optics, nuclear reactor control rods, and ceramic glazes.

The defense applications are what pushed antimony onto the U.S. Department of Interior’s critical minerals list and what makes the Chinese export controls a national security issue rather than just a commodity market disruption. Antimony hardens the lead in bullets — without it, projectiles deform on impact and lose penetrating capability. It’s a component in armor-piercing ammunition, night vision goggles, infrared missile seekers, and military battery systems. The U.S. consumed roughly 22,000 tons of antimony in 2023. China supplied 63% of U.S. imports. The next largest supplier was Belgium, at 8%. The U.S. has not had a domestic antimony mine in production since the early 2000s. The last significant domestic reserve — the Stibnite mine in central Idaho, now owned by Perpetua Resources — has received Department of Defense funding but isn’t expected to begin production until 2028 at the earliest, and even then its antimony grades average less than 0.5%, which is roughly 50 times lower than the 25% concentrate minimum that roasters need to produce metal and antimony trioxide efficiently. The CHIPS Act’s critical minerals provisions addressed some of these vulnerabilities at the legislative level. The operational reality is that legislation and mine output operate on fundamentally different timescales.

The price chart tells the story

Antimony’s price action in 2024-2025 is one of the most dramatic commodity charts of the decade. Through early 2024, the metal traded between $15,000 and $18,000 per metric ton — already elevated from historical levels due to supply tightness, but within a range that existing procurement budgets could absorb. Between the August announcement and September implementation of the export controls, prices doubled. By the end of 2024, they had tripled. By mid-2025, European antimony prices exceeded $60,000 per metric ton — a roughly 4x increase in under a year. This wasn’t speculative froth. The largest antimony roaster outside of China — an Omani facility that had been supplying much of the Western world’s antimony trioxide and ingots, processing roughly 20,000 metric tons of contained antimony annually — went bankrupt during the same period, unable to secure sufficient raw material at prices its contracts could support. The supply chain lost its single largest non-Chinese processing node at the exact moment it needed it most.

The price spike created a two-tier market that mirrors what happened with gallium and germanium — domestic Chinese prices stabilized and even pulled back as export restrictions reduced outbound volume, while international prices soared. Chinese consumers of antimony — manufacturers of flame retardants, batteries, semiconductors, ammunition — gained a cost advantage over their Western competitors. Whether that cost advantage was an intended consequence of the export controls or a side effect is, at this point, a distinction without a meaningful difference. The structural pattern is the same one China has deployed across rare earths, gallium, germanium, graphite, and tungsten: control enough of the global supply chain that export licensing decisions function as de facto trade policy, without the formal trade-war optics of tariffs or quotas.

Why there’s no quick fix

The antimony supply chain has three structural characteristics that make diversification harder than the “just find another supplier” framing suggests.

The first is geology. Antimony deposits are geographically concentrated. China produces 48% of global output. Russia and Tajikistan are the next largest producers — neither of which solves the geopolitical dependency problem for Western buyers. Bolivia, Turkey, and Myanmar produce smaller volumes. Australia has deposits but limited processing capacity. The global production base outside of China and its strategic allies is genuinely thin, and the thin parts are years away from meaningful expansion.

The second is processing. China controls not just mining but an estimated 74% of global antimony trioxide refining capacity. Even if a Western mining company could produce antimony concentrate tomorrow, it would need a roaster to convert that concentrate into the oxide or metal that downstream manufacturers actually use. The Omani roaster’s bankruptcy removed the largest non-Chinese processing facility from the global supply chain. Building new roasting and refining capacity is a multi-year, capital-intensive process with environmental permitting requirements that vary by jurisdiction and add time in every one of them.

The third is substitution — or the lack of it. For most of antimony’s critical applications, there is no drop-in substitute. Antimony trioxide’s combination of flame-retardant effectiveness, compatibility with a wide range of polymers, and cost has made it the industry standard for decades. Alternative flame retardants exist — aluminum trihydrate, magnesium hydroxide, ammonium polyphosphate — but they require reformulation of the polymer systems they’re added to, requalification testing, and in many cases higher loading levels that change the physical properties of the end product. For ammunition hardening, antimony has no practical substitute at scale. The Department of Defense has recognized this explicitly. The constraint isn’t that alternatives don’t exist in a laboratory. The constraint is that switching materials in industrial and military supply chains is a process measured in years, not months — and the export controls created an immediate shortage, not a multi-year one.

The defense industrial base problem

The antimony shortage intersects with a broader constraint that our Battlefields of the Future course covers in detail: the Western defense industrial base is not built for sustained high-intensity conflict. U.S. foreign military sales reached a record $238 billion in 2023, driven by demand from the wars in Ukraine and the Middle East. Ammunition consumption in Ukraine alone has exceeded production rates across NATO countries for most of the conflict. The loitering munitions and drone warfare revolution has changed the calculus of what modern armies need — but conventional ammunition remains the backbone of ground combat, and conventional ammunition requires antimony.

The irony is structural: the country that supplies the ammunition-hardening material to Western militaries is the same country whose military modernization program — conducted through entities like the China Poly Group and the broader military-civil fusion strategy — those Western militaries are arming against. China controls the supply chain for a material that Western armies need to fight, and has the ability to restrict that supply chain at will. The export controls on antimony are, in that framing, not a trade dispute. They are a capability constraint imposed by a strategic competitor on its adversaries’ defense industrial base, using the commodity market as the delivery mechanism.

What’s happening now

By early 2026, the panic-driven shortage of 2025 has partially eased. Southeast Asian processing capacity has begun coming online. Chinese export license approvals have become more predictable, though still selective. Prices have retreated from the July 2025 peak but remain well above pre-2024 levels — the structural fragmentation Beijing created isn’t reversible through market forces alone. Companies that diversified sourcing in 2025 are paying premiums for supply security. Companies that didn’t are still exposed.

Perpetua Resources’ Stibnite mine in Idaho remains the highest-profile domestic alternative, with DOD investment and a projected capacity that could supply up to 35% of U.S. antimony demand. Production isn’t expected until 2028. The timeline has slipped multiple times. Turkish mines are producing at 1-2% feed grades, struggling to concentrate their output to the 25% minimum that roasters require. The gap between what the Western world needs — reliable, non-Chinese antimony supply at industrial scale — and what the Western world has built is measured in years of mine development, roaster construction, and permitting that hasn’t started yet. The rare earth recycling infrastructure that would eventually allow antimony recovery from end-of-life batteries and flame retardant products is even further behind — the U.S. currently recovers about 18% of its antimony demand through lead-acid battery recycling, which is one of the few bright spots in an otherwise thin domestic supply picture.

Why it matters beyond antimony

Antimony is Lecture 32 of 36 in the Rare Earth Elements course, and by the time you get to it, the pattern is unmistakable. Gallium and germanium: export controls in 2023. Graphite: export controls in 2023. Rare earth processing technologies: export ban in December 2023. Antimony: export controls in August 2024, escalated to a military-end-user ban in December 2024. Tungsten and superabrasives: export controls in early 2025. Each announcement follows the same mechanism — license requirements, selective approvals, price spikes, two-tier markets, downstream industry disruption — and each one reveals the same underlying structural vulnerability: China’s dominance of critical mineral supply chains is not limited to mining. It extends through refining, processing, and manufacturing, at concentrations that give Beijing the ability to impose costs on adversaries through commodity markets rather than military force.

The semiconductor supply chain has its own version of this vulnerability — concentrated in a different geography, dependent on a different set of materials, but structurally identical in the sense that a small number of facilities and a small number of countries control chokepoints that the global economy cannot easily route around. The antimony case is smaller in dollar terms than semiconductors or rare earth magnets. But the pattern it demonstrates — that a $15,000-per-ton metalloid can become a $60,000-per-ton national security crisis in eight months because one country controls both the mine output and the refining capacity — is the pattern that defines the critical minerals landscape of the 2020s.

This is the kind of supply chain vulnerability our Rare Earth Elements course was built to map — where a metal most people have never heard of turns out to be the reason their furniture doesn’t catch fire, their bullets work, and their night vision functions, and the country that supplies 48% of it just decided that continued supply is conditional.