A new Bloomberg feature has put a spotlight on one of the U.S. defense industrial base’s most acute supply-chain vulnerabilities: its near-total dependence on China for the heavy rare-earth permanent magnets used in fighter jets, missiles, drones, submarines and a growing list of advanced weapons systems. The report underscores how a small group of elements — in particular dysprosium and terbium, refined and processed almost exclusively in China — sit at the heart of modern Western military power.
Heavy rare earths are the ingredient that allows neodymium-iron-boron magnets to keep their strength at the high temperatures found inside guided-weapon actuators and electric motors. The United States retains some mining capacity and is rebuilding processing, but commercial-scale separation and magnet manufacturing for the heavy elements remains overwhelmingly concentrated in China, giving Beijing significant leverage as it tightens export controls. Bloomberg characterises the gap as a strategic weakness years in the making.
For investors in critical-minerals strategies, the piece reinforces a familiar thesis: heavy rare-earth supply security is no longer a niche resource story but an active national-security priority, with policy support, stockpiling programs and Western processing investment all moving in the same direction. Expect continued government backing for non-Chinese separation and magnet capacity to be a defining theme of the cycle.
Source / Further reading: Bloomberg — US-China Heavy Rare Earth Magnets & Defense