Project Vault Is Filling Up-but What Happens When China Stops Selling?

Highlights

• Adding commodity traders Glencore and Mercuria moves Project Vault from financial concept toward physical execution, but sourcing gaps remain unresolved.
• REEx warns America is inside the Transition Vulnerability Window, where Chinese dependencies persist even as Western processing capacity is being built.
• Critics question what exactly enters the vault—oxides, metals, alloys, or magnets—since rare earths are not interchangeable like barrels of oil.
• Beijing can respond to U.S. accumulation by adjusting exports or competing for feedstock, potentially tightening markets before Western capacity matures.
• Speed and conversion capacity matter more than scale: without reliable separation and metallization, Vault is insurance against disruption, not independence from it.