Global rhenium production in 2024 was approximately 62,000 kilograms — 62 tonnes. That’s it. The entire world’s annual output of the metal that allows jet engines to operate at 1,700 degrees Celsius without the turbine blades melting would fit inside two shipping containers. Rhenium prices rose 91.5% in 2025, then added another 34% in the first quarter of 2026, reaching roughly $2,400 per kilogram in Europe. The price action isn’t speculative froth — it’s a structurally tiny market absorbing the largest commercial aviation production ramp-up in history. Boeing and Airbus have combined backlogs of more than 15,000 aircraft. Each wide-body jet engine contains several kilograms of rhenium concentrated in the turbine blades that spin at 40,000 RPM in exhaust gas temperatures that would liquefy any unalloyed metal on the periodic table. A single company — Molymet S.A. in Chile — controls 60% of global rhenium production. Rhenium has no primary mine anywhere on Earth. It is recovered exclusively as a by-product of molybdenum roasting, which is itself a by-product of copper mining. The by-product supply ceiling that constrains indium, tellurium, and the noble gases applies here in its most extreme form: rhenium is a by-product of a by-product. Two layers of someone else’s business model between you and the metal your jet engine needs.
What rhenium does
Rhenium has the third-highest melting point of any naturally occurring element — 3,186°C — and the highest boiling point of all. When alloyed with nickel at 2-6% by weight, it forms single-crystal superalloys — materials like CMSX-4 and René N5 — that retain their structural integrity under the combination of extreme heat, extreme mechanical stress, and corrosive combustion gases that exist inside a jet engine’s high-pressure turbine section. Without rhenium, turbine blades deform under the sustained loading at operating temperature — a failure mode called creep — and the engine loses efficiency, thrust, and eventually structural integrity. The addition of rhenium doesn’t just improve performance. It makes the performance possible. Modern high-bypass turbofan engines like the GE9X (which powers the Boeing 777X) and the Rolls-Royce Trent XWB (which powers the Airbus A350) were designed around rhenium-containing superalloys. You cannot substitute the rhenium out of these engines without redesigning the turbine, recertifying the engine, and accepting lower operating temperatures that reduce fuel efficiency — a process that takes years of testing and hundreds of millions of dollars in development cost.
Roughly 80% of global rhenium consumption goes into aerospace superalloys. The remaining 20% splits between petroleum refining catalysts — rhenium-platinum catalysts are essential for producing high-octane lead-free gasoline — and a growing list of niche applications including medical isotopes (rhenium-186 and rhenium-188 for cancer therapy), radiation shielding, and high-precision surgical instruments.
The double by-product problem
The rhenium supply chain is the purest expression of the by-product constraint the Rare Earth Elements course has been documenting across indium/tellurium, noble gases, and iridium within the PGM complex. But rhenium adds a layer of complexity the others don’t have.
Copper is mined from porphyry deposits in Chile, the United States, Peru, and Kazakhstan. Some of those copper ores contain molybdenite — a molybdenum sulfide mineral — which is recovered as a by-product of copper processing. The molybdenite concentrate is then roasted to produce molybdenum trioxide, and during that roasting process, rhenium volatilizes out of the concentrate as rhenium heptoxide in the flue gas. Specialized scrubbers in the roasting facility’s exhaust system capture the rhenium. If the scrubbers aren’t installed, or aren’t optimized for rhenium recovery, the rhenium exits the smokestack and disperses into the atmosphere. Gone.
Chile produced 29,000 kilograms of rhenium in 2024 — nearly half the global total — because Chile has the world’s largest copper-molybdenum porphyry deposits (Escondida, Chuquicamata, El Teniente) and because Molymet, the Santiago-based molybdenum processor, installed rhenium recovery equipment decades ago and has since acquired downstream processing capacity including Rhenium Alloys in Ohio, now operating as Molymet Alloys USA. The United States produced 9,500 kg, mostly from Freeport-McMoRan’s copper-molybdenum operations in Arizona and New Mexico. Poland produced 9,400 kg from KGHM’s copper operations. China produced 5,300 kg. The entire rest of the world produced the remainder.
The structural constraint is identical to indium’s but twice compounded: if the world needs more rhenium, it needs more molybdenum roasting capacity with rhenium recovery equipment installed, which requires more molybdenum concentrate, which requires more copper mining. The decision to expand copper production is made by copper companies based on copper economics. The decision to install rhenium scrubbers is made by molybdenum processors based on rhenium prices relative to scrubber capital costs. At each layer, the entity making the production decision is optimizing for a different metal than the one the aerospace industry needs. Supply elasticity is, in the language of the economics textbooks, structurally constrained. In the language of the Battlefields of the Future course: the fighter jet’s turbine blade depends on a molybdenum roaster in Chile deciding the flue gas scrubber is worth the investment.
The aerospace bottleneck
The demand side of the rhenium market is defined by a single fact: the global aviation industry is attempting the largest production ramp-up in its history, and every new engine needs rhenium. The pandemic cleared factory floors, grounded aircraft, and delayed maintenance cycles. The recovery has produced backlogs that will take a decade to work through. Every widebody engine, every military fighter jet engine, every industrial gas turbine that uses rhenium-containing superalloys draws from a 62-tonne global pool. Demand is projected to grow at 2.1% annually through 2034 — a modest growth rate in percentage terms, but applied to a base so small that even modest demand growth tightens supply.
Turbine blades have 15-to-25-year service lives before they’re retired and recycled. The recycling rate for rhenium from spent superalloys and foundry revert material is 25-50% — significantly better than most critical minerals but constrained by long collection cycles and the capital intensity of superalloy recycling. GE Aerospace and Rolls-Royce have both established closed-loop product stewardship programs to recover rhenium from spent blades. The rare earth recycling infrastructure the course has documented is nascent for most minerals. For rhenium, it’s more mature — but still limited by the physics of 15-year wait times between engine installation and blade retirement.
GE and Rolls-Royce have also invested in “rhenium-lean” and “rhenium-free” superalloy formulations using combinations of ruthenium, tantalum, hafnium, tungsten, and molybdenum. Some newer engine designs have successfully reduced rhenium loading. But the installed fleet and the engines currently in production were designed around rhenium-containing alloys, and redesigning a turbine blade is not a materials-substitution exercise you complete in a quarter. Each new alloy formulation requires years of creep testing, oxidation testing, fatigue testing, engine testing, and FAA certification before it can be deployed in a commercial aircraft. The semiconductor supply chain can redesign a chip in 18 months. A turbine blade alloy substitution takes a decade.
Why it’s in the course
Rhenium is the Rare Earth Elements course’s most extreme case study of by-product dependency — and the one that connects the critical minerals thesis directly to the aerospace and defense industrial base. The antimony post documented a mineral whose supply was disrupted by deliberate export controls. The nickel post documented a market restructured by deliberate resource nationalism. The noble gases post documented a supply chain that concentrated by accident and broke because of a war. Rhenium is none of those things. Rhenium’s supply constraint is the most permanent kind: the element is genuinely one of the rarest on Earth — 1 part per billion in the crust, rarer than gold, rarer than platinum, rarer than all but a handful of stable elements — and it can only be obtained as a by-product of a by-product, from mines built for a different purpose, processed by companies optimizing for a different metal, at volumes that cannot be meaningfully increased without expanding copper mining globally.
The lithium supply chain has a demand problem — consumption is growing faster than supply can respond. The copper supply chain has a capacity problem — there aren’t enough mines being built. Rhenium has a physics problem. There is no rhenium mine to build. There is no rhenium deposit to discover. There is only the copper-molybdenum system, the flue gas, the scrubber, and the 62 tonnes per year that represents the ceiling the aerospace industry is building its production ramp-up under.
This is the kind of supply chain our Rare Earth Elements course was built to map — where the metal that allows a turbine blade to survive 1,700 degrees at 40,000 RPM is recovered from the smokestack exhaust of a molybdenum roaster in Santiago, at 62 tonnes a year, with a single company controlling 60% of global output, and the entire commercial aviation industry’s production backlog competing for every gram.
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