The rare-earth elements are seventeen chemically similar metals whose oxides and alloys underpin high-energy permanent magnets, and whose commercial chokepoint is not mining but separation and magnet-making, where China holds roughly 90% and 94% of world capacity respectively ref.
Summary
Rare-earth elements (REEs) are the lanthanide series plus scandium and yttrium. Despite the name they are not geologically scarce; the difficulty is that they occur intermixed in the same minerals and, because their chemistry is nearly identical, must be separated by long cascades of solvent-extraction stages before they are useful. The commercially decisive uses are the light REEs neodymium and praseodymium in NdFeB permanent magnets, and the heavy REEs dysprosium and terbium, which are added to those magnets to retain coercivity at motor operating temperatures ref. Those magnets are the torque-dense core of EV traction motors, direct-drive wind generators, robotic and defence actuators, and hard drives.
The supply structure is the whole story. In 2025 China mined about 270,000 t REO-equivalent against the United States’ ~51,000 t (Mountain Pass plus a Georgia operation), Australia’s ~29,000 t and Myanmar’s ~22,000 t. That is roughly 60% of mining, but China processes and separates about 90% of global REEs and makes about 94% of NdFeB magnets ref. A separate 2026 assessment frames the same asymmetry as G7 countries being able to mine but losing 85% of the chain before magnets, with non-China magnet capacity at about 6% ref. Heavy REEs are the most concentrated and highest-leverage segment of all.
The parameters that decide outcomes are therefore downstream, not geological: separation-cascade capacity and the metallisation and alloying steps between oxide and magnet; how far dysprosium loading can be cut by grain-boundary diffusion (cited at 30-50% reduction) and how fast magnet-free motor architectures scale ref; and the export-control regime, which since April 2025 has covered seven rare earths under a dual-use licensing system ref and was consolidated in March 2026 under State Council Order No. 834, China’s first dedicated supply-chain security framework ref.
Evidence base
- 2025 mine production: China ~270,000 t REO-equivalent, United States ~51,000 t, Australia ~29,000 t, Myanmar ~22,000 t; China mines ~60% but separates ~90% and makes ~94% of NdFeB magnets ref.
- Non-China permanent-magnet capacity is about 6%, with roughly 85% of the G7 chain absent between mine and magnet, reported 30 June 2026 ref.
- April 2025 restrictions on seven rare earths plus dual-use licensing continued constraining exports to US and allied military end-users through 2026 ref.
- State Council Order No. 834 of 31 March 2026 created China’s first dedicated supply-chain security framework, unifying export controls, countermeasures and investment screening ref.
- China restricted rare-earth exports to the United States and Japan in March 2026 ref.
- The suspension of China’s dysprosium and terbium controls expires November 2026; grain-boundary diffusion (30-50% Dy reduction) and magnet-free motors are judged unable to offset re-imposition in time, with MP Materials’ +10 kt arriving by 2028 ref.
- Laser-ablation dual-comb spectroscopy demonstrated REE atomic, ionic and oxide absorption signatures in certified reference materials across three spectral windows, targeting standoff exploration and ore sorting, 6 May 2026.
Open questions
- Does China re-impose or extend dysprosium and terbium controls when the temporary suspension expires in November 2026, and at what licensing stringency?
- Can Western projects close the metallisation and alloying steps between separated oxide and finished magnet, which is where the sources say 85% of the G7 chain disappears?
- How far can dysprosium loading actually fall in production magnets beyond the cited 30-50% grain-boundary-diffusion reduction, and at what cost or performance penalty?
- Do rare-earth-free magnet routes such as tetrataenite reach any documented production volume or motor-grade performance figure, rather than laboratory manufacturing demonstrations?
Assessment drafted 2026-08-31 from up to 16 KB sources using the technology-scorecard framework; scores are a draft read pending review.