China's limits on rare earth exports make processing the scarce step, helping US processors more than miners

The 2010-2011 China rare earth export quota crisis is the direct historical precedent. China cut export quotas by ~40% in 2010, sending dysprosium prices from ~$150/kg to over $2,000/kg by 2011. The companies that benefited most were not the miners but the downstream processors and magnet manufacturers with non-Chinese supply chains — Molycorp's processing subsidiary and rare earth recyclers saw margin expansion of 200-400bps during the squeeze. The pattern repeated in 2019 when China threatened rare earth restrictions during the US-China trade war: MP Materials (then private) accelerated its separation facility buildout and subsequently commanded a government-backed offtake. The behavioral pattern is consistent: policymakers and OEMs consistently underinvest in processing capacity during calm periods, then scramble to sign above-market contracts when supply is threatened — rewarding the few processors who built capacity ahead of the crisis.

The strongest bear case is that China's export control threat is primarily a negotiating tactic — the IEA itself notes that 'further expanded controls have been suspended until November 2026,' suggesting China is using the threat strategically rather than implementing it fully. The specific assumption most likely to be wrong is that OEMs will actually sign long-term above-market offtake agreements rather than waiting out the uncertainty, given that the 2010-2011 price spike reversed sharply once China backed down. If rare earth spot prices (dysprosium, terbium) fail to sustain elevated levels over the next 60 days, it would signal the market doesn't believe the restriction is durable, and the processing premium thesis collapses before it can be monetized.