One finding runs through the layer: the chokepoint is rarely the mine — and when it is, geology is why. The same lesson the atlas draws for single materials — the refiner is not the source — scales up to whole technologies: as a raw material becomes a feedstock, a component and then a finished machine, the binding constraint keeps moving downstream, to the furnace, the fab, the magnet, the enrichment plant, the transformer. That distinction is the useful one, because a constraint that was built can be rebuilt elsewhere — a new smelter, fab, casting shop or cable yard, given time and capital. A handful of chains break the pattern, and they break it for the same reason: the chokepoint is a deposit that cannot be substituted or relocated — phosphate reserves (~70% Morocco, no substitute for phosphorus), the platinum-group Bushveld, and niobium's essentially single Brazilian mine. A built chokepoint is a policy problem; a geological one is a fact of the map. And the built ones are not all alike: a stage concentrates for a knowable reason — a continuous-hot process that must be one big unit at cheap power, a by-product that can't scale alone, a capability that takes years to qualify, or a rule — and the Chokepoint Map sorts all 58 by that mechanism, because the mechanism is what tells you the fix.
The chokepoint moves as silicon becomes a chip
China dominates raw silicon metal, but the scarce electronic-grade purification and blank-wafer capability sits in the US, Germany, Japan and Taiwan. The bottleneck is downstream, not at the mine.
Open the chain →For AI, the chip is ready — the power isn't
Beyond the accelerator, usable compute needs electricity and a grid connection. Data-centre power is set to roughly double by 2030; transformers and interconnection queues, not silicon, are the emerging wall.
Open the chain →The whole solar panel is a China product now
China makes ~85–98% of every stage — polysilicon, wafers, cells, modules — even as each panel uses about eight times less silicon than twenty years ago. The chokepoint is the factory, not the element.
Open the chain →A wind turbine's bottleneck is scale, not scarcity
A turbine is mostly steel and concrete; no rare mineral gates it. The real constraints are physical size, logistics and OEM concentration — now about two-thirds Chinese. Rare-earth magnets appear only in some drivetrain designs.
Open the chain →A uranium mine is not a nuclear fuel supply chain
Nuclear runs on a sequence of specialised, concentrated capabilities — mining, conversion, enrichment, fabrication. The mine is the least concentrated stage of the four.
Open the chain →For the grid, the bottleneck is the component, not the ore
The next grid build-out rivals the length of today's entire grid. Copper and aluminium are abundant; the squeeze is transformers, cable and the factories that make them.
Open the chain →A battery is a changing recipe, not a single mineral
The tightest bottleneck migrates with chemistry — NMC's cobalt and nickel, LFP's phosphate and graphite, sodium's escape from both. "The battery material" depends on the year and the cell.
Open the chain →An EV is a battery with a car around it
The car inherits its chokepoints from the battery and magnet chains; the newest concentration is plain assembly — China builds about 70% of the world's electric cars. The magnet motor, unlike the battery, can be designed out.
Open the chain →For magnets, the mine is only the first bottleneck
Rare-earth mining expanded more than 200-fold, but the strategic squeeze tightened downstream — separation, metal, alloy and sintered-magnet capability, overwhelmingly in China. This chain feeds both wind and EVs.
Open the chain →No scarce metal gates the heat pump
It is commodity metals around a compressor and a regulated refrigerant. The binding constraints are factory capacity, the Kigali HFC phase-down and skilled installers — a labour market, not a mine.
Open the chain →Electrolysers: tiny today, iridium-gated at scale
Green-hydrogen electrolysis is still only a few gigawatts. Its future chokepoint is iridium for PEM stacks — one of Earth's rarest metals — but alkaline stacks (nickel) avoid it entirely. The chemistry is the lever.
Open the chain →A jet engine's bottleneck is not the ore
Chile's rhenium is a copper by-product; China makes most titanium sponge but almost none is aerospace-qualified; blade casting and engine assembly are a three-firm Western oligopoly. Every stage downstream is more concentrated than the mine.
Open the chain →The West's weapons run on materials a rival controls
Radar (gallium), night vision (germanium), munitions (antimony, tungsten) and precision guidance (rare-earth magnets) all depend on China-dominated materials — the same ones placed under export control in 2023–2024 and briefly banned to the US.
Open the chain →For food, the mine is the chokepoint
The one chain that inverts the thesis: phosphorus has no substitute, its only source is phosphate rock, and ~70% of reserves are in Morocco. Here the raw resource — not a downstream stage — is the binding constraint.
Open the chain →Two countries mine it, and its own scrap saves it
Platinum, palladium and rhodium come from essentially two places — South Africa and Russia — but recycling of spent catalytic converters relieves the chokepoint. The real threat is EV demand destruction, not a supply cut.
Open the chain →The internet's backbone is a trace of germanium
Optical fibre is silica doped with germanium (China ~60%, export-controlled), and just four firms — ASN, SubCom, NEC, HMN — lay the world's submarine cables. Two chokepoints, upstream and down, with China at both ends.
Open the chain →Steel is abundant; the metals that make it strong are not
Iron and coking coal are everywhere, so steel isn't a chokepoint — but the alloying additions that give it strength come from a handful of sources: niobium (~92% Brazil, one company), chromium, vanadium and manganese.
Open the chain →Aluminium is congealed electricity
Bauxite is mined in three places at once (Australia, Guinea, China ~25% each), but smelting is so electricity-hungry the chokepoint is the smelter — China's share jumps from ~21% at the mine to ~59% at the furnace.
Open the chain →The copper chokepoint is a clock, not a map
Copper mining is spread across five countries and even diversifying — so the risk isn't a monopoly. It's time: electrification lifts demand ~30% by 2040 while the mine pipeline points to a ~30% shortfall by 2035, and a new mine takes 10–20 years.
Open the chain →Every screen you touch runs on a metal no one mines on purpose
The transparent conductor on every LCD and touchscreen is indium tin oxide. Indium is a trace zinc by-product, ~70% refined in China — and China placed it under export control in 2025, dropping exports 72%.
Open the chain →Every battery has a graphite anode — made in China
China mines ~74% of natural graphite but makes almost 100% of the spherical, coated anode graphite every lithium cell needs — and put it under export licensing in December 2023. The mine is the lesser chokepoint.
Open the chain →One mineral gates chips, batteries and cooling at once
Fluorspar — China ~65%, up from ~37% in 2000 — becomes hydrogen fluoride, the gateway to semiconductor etch gases, lithium-battery electrolyte and refrigerants. Three unrelated chains share one upstream node.
Open the chain →For steel, the ore is abundant — coal and the green shift aren't
Iron ore is plentiful (Australia, Brazil); the chokepoints are metallurgical coking coal and, for green steel, scarce DRI-grade ore plus clean hydrogen. China smelts ~52% of the world's crude steel.
Open the chain →Nothing electronic works without tin
About half of tin is solder — the joint in every circuit board. Supply is concentrated in China and Indonesia and conflict-linked (Myanmar's Wa State suspended mining in 2023; the 3TG minerals).
Open the chain →The capacitor metal comes from a conflict zone
Tantalum capacitors sit in every high-reliability device — phones, cars, aircraft, implants. But ~70% of the metal is mined in the DR Congo and Rwanda (a 3TG conflict mineral), while powder processing is China-led.
Open the chain →The gas that cools MRI scanners can't be made
Helium is a by-product of a few helium-rich gas fields (US, Qatar, Russia); it can't be synthesised and escapes to space once used. For cooling MRI magnets, chips and fibre there is no substitute.
Open the chain →Chip lithography runs on a gas Ukraine supplied half of
DUV lithography's excimer lasers use neon, a by-product of steel-plant air separation. Ukraine supplied ~half the world's semiconductor-grade neon before the 2022 shock exposed how thin the link was.
Open the chain →Half the world eats thanks to nitrogen pulled from the air
Synthetic nitrogen fertilizer feeds ~half the planet. Its raw material is the air itself, but its chokepoint is natural gas — Europe's 2022 gas spike simply shut ammonia plants down, a food shock driven by energy.
Open the chain →The chip metal China turned into a lever
China makes ~99% of primary gallium — a by-product of aluminium and zinc refining — and export-controlled it in July 2023. It gates the GaN and GaAs chips behind radar, 5G and EV power electronics.
Open the chain →Cobalt has a mine problem and a refining problem
~75% is mined in the DR Congo (with artisanal and child-labour concerns) and ~75% refined in China. The industry's answer has been to engineer cobalt down with LFP and low-cobalt cathodes, not find new mines.
Open the chain →Indonesia rewrote the nickel map with one policy
By banning raw-ore exports to force domestic (China-financed) smelting, Indonesia went from ~8% to ~67% of world nickel mining in a decade — a chokepoint built by policy, spanning stainless steel and battery-grade nickel.
Open the chain →You can't machine metal without tungsten
Tungsten carbide makes the cutting tools that shape everything else and the penetrators that arm munitions. China has mined ~80% for decades and added tungsten to its export-control list in February 2025.
Open the chain →The lithium mine moved to Australia — the refinery stayed in China
Australia mines ~62% of lithium (hard-rock spodumene) and the Lithium Triangle holds vast brine reserves, but most is converted to battery-grade chemical in China. The chokepoint is the refining step, not the deposit.
Open the chain →Ninety percent of titanium is paint; the rest flies and fights
~90% of titanium is TiO2 pigment, a diversified commodity. The strategic sliver is aerospace-grade metal 'sponge' — concentrated in China, Japan, Russia (VSMPO-Avisma) and Kazakhstan, and embedded in Boeing and Airbus supply chains.
Open the chain →One country makes almost all the magnesium — and once switched it off
China makes ~87% of primary magnesium (coal-fired Pidgeon process). It is near-unsubstitutable for aluminium alloys, so when China's 2021 energy curbs cut output, European industry was weeks from a shortage.
Open the chain →Diversified mine, China-only battery refining
Manganese is irreplaceable in steel (~90% of use), and its ore is spread across South Africa, Gabon and Australia. But battery-grade manganese sulphate and electrolytic metal are ~90% China — a chokepoint the diversified mine map hides.
Open the chain →Flame retardants, ammunition — and a 2024 lever
Antimony is ~half flame retardants and half strategic military use (munitions, night-vision). China's mine share fell to ~43%, but refining and the September-2024 export controls stayed with China.
Open the chain →Gallium's twin — the infrared metal
Germanium, a by-product of zinc and coal (~60%+ China), was export-controlled alongside gallium in July 2023. It makes infrared / night-vision optics and the light-guiding cores of optical fibre.
Open the chain →There is no stainless steel without chromium
Chromium gives stainless steel its corrosion resistance — no substitute — and goes into jet-engine superalloys. The ore is South-Africa-led, but the electricity-hungry ferrochrome smelting migrated to Kazakhstan and China.
Open the chain →A pinch strengthens steel — and might store the grid
~90% of vanadium micro-alloys steel (stronger rebar and pipeline); China now mines ~64% as a steel by-product. Its second act is vanadium-redox-flow batteries for long-duration grid storage.
Open the chain →The chemical that feeds the world is a fossil by-product
Sulfuric acid is the highest-volume industrial chemical; most sulfur is a by-product of oil and gas desulfurization — so decarbonization threatens the supply that gates phosphate fertilizer and battery-metal leaching.
Open the chain →The most-used material has no chokepoint — only carbon
Concrete is the second-most-used substance after water, but limestone and kilns are everywhere, so there is no supply chokepoint. The only binding constraint is CO₂ — about 8% of global emissions.
Open the chain →Most silver is a by-product, and solar is eating it
~70% of silver is a by-product of lead, zinc, copper and gold mining, so supply can't scale to demand; solar-cell paste is the fast-growing swing consumer, and there is no substitute in high-end contacts.
Open the chain →The one critical metal the West controls
Beryllium reverses the map: the US mines ~55% and dominates processing (a single Utah deposit, one firm) for aerospace, defence and copper alloys. Toxicity is the barrier — and China's share is rising.
Open the chain →The invisible host of the by-product metals
Zinc's strategic role is as the host: gallium, germanium, indium and cadmium are recovered from zinc smelting, so refining capacity (China ~half) gates them. The by-product cluster, explained at its source.
Open the chain →Two countries hold the world's boron
Boron (borates) is a geological chokepoint: Turkey holds ~70% of world reserves, the US a single California mine. In fibreglass, fertilizer and borosilicate — and it's the B in NdFeB magnets.
Open the chain →The most-recycled metal runs in a loop
Lead is the atlas's circular counter-story: ~60% is recycled from spent lead-acid batteries, locally — so there is no geographic chokepoint. The real risk is toxicity and informal recycling, not scarcity.
Open the chain →The metal that clads nuclear fuel
Zircon sand is abundant, but nuclear-grade zirconium must have its chemical-twin hafnium removed for reactor cladding — a hard, qualified capability held by only a few producers (France, US, Russia, China).
Open the chain →Made in six ageing reactors, and can't be stored
The world's most-used medical isotope (technetium-99m from molybdenum-99) is made in about six ageing research reactors. A 66-hour half-life means no stockpile — so a single outage causes global imaging shortages.
Open the chain →Rare earths aren't rare — separating them is the game
The 17 rare earths are common but occur mixed; separating them into pure oxides (~90% China) gates the whole basket — magnets, phosphors, cerium polishing and lanthanum refining catalysts alike.
Open the chain →Before the chip, the chemicals — and Japan makes most
A fab runs on ultra-pure chemicals: advanced photoresist is ~90% Japan, plus process gases, CMP slurries and EUV pellicles — thin, qualified-supplier chokepoints upstream of the fab itself.
Open the chain →You can't drill a well without this invisible mineral
Baryte (barium sulfate) is the dense weighting agent in drilling mud that stops oil and gas wells blowing out. Abundant and diversified (India, China, Morocco) — no chokepoint, but no substitute.
Open the chain →The cheap magnet's metal, and the red in fireworks
Strontium makes ferrite (rare-earth-free) magnets — the low-end magnet hedge when NdFeB is too costly — plus the crimson in fireworks and flares. A small celestite market, now led by Iran (~58%).
Open the chain →The poison that's also a semiconductor
High-purity arsenic is half of gallium arsenide (radar, RF and LED chips), but it's a toxic by-product of copper and gold smelting that nobody wants to make — China's share fell from ~72% to ~40% as Peru rose.
Open the chain →The metal that lets steel take the heat
Molybdenum hardens and heat-proofs steel — superalloys, stainless, tool steel — and catalyses the desulfurisation of fuels. About half a copper by-product, diversified across Chile, China, the US and Peru: essential, but not a chokepoint.
Open the chain →One of the rarest metals, hiding in copper sludge
Tellurium is recovered from copper-refinery anode slimes — an extreme by-product. It makes CdTe thin-film solar (the main non-silicon PV) and thermoelectric coolers, but can't scale beyond what copper provides.
Open the chain →The jet-engine metal, a by-product of a by-product
Rhenium is recovered from molybdenum roasting — itself a copper by-product. A few percent in single-crystal nickel superalloys lets turbine blades run hotter, so it gates jet-engine efficiency. Aerospace-driven, heavily recycled.
Open the chain →The non-toxic heavy metal replacing lead
Bismuth is dense like lead but non-toxic, so it replaces lead in plumbing, alloys and shot — plus pharma and cosmetics. A by-product of lead and tungsten smelting, ~80% China: the safe metal with a concentrated supply.
Open the chain →How each chain is built
The chains follow one rule set, so they can be read against each other and against the material profiles. It is the same discipline the atlas applies to single materials — separate the measures, and never claim more than the data can carry.
- Define the physical transformation first, then choose the dataset — not the other way round.
- Prefer production or capacity for "who makes it"; trade shares are not factory shares.
- Show ownership separately when a handful of firms — not countries — hold the stage.
- Use customs data only at the specificity the HS code actually has — never split a shared code by price.
- Put years, units, scope and forecast status beside every number.
- Extend the history only as far as comparable evidence allows — show the gaps rather than splice incompatible measures into a false series.
Sources are logged per chain (OECD, IEA / IEA-PVPS, IRENA, USGS, SIA, SEMI, UN Comtrade via CEPII BACI) in each chain's PRODUCTION.md ledger, with rejected interpretations recorded in NOTES.md. Public data only.