Rare‑earths: leverage and fallout

China has loosened some rare-earth export curbs until November 2026, but it did not give up the choke point that matters most: the chemical processing plants that turn rock into magnet material for electric cars, wind turbines and missiles. That is why a “reprieve” is not the same thing as a replacement. The International Energy Agency said China was the leading refiner for 19 of 20 strategic minerals in its 2025 outlook, with an average refining share of 70 percent. Rare earths are not especially rare in the ground. The bottleneck is the dirty, acid-heavy refining step, which works like separating a box of nearly identical screws one by one and then turning them into high-performance magnets. The rare earths that keep showing up in this fight are the heavy ones, including dysprosium and terbium. Those two metals help magnets keep working at high temperatures inside electric vehicle motors, wind turbines and military hardware. China spent years building that middle of the supply chain, and it also pushed a lot of the messier extraction over the border into Myanmar. Global Witness said China controls nearly 90 percent of global rare-earth processing capacity while much of the heavy rare-earth mining feeding that system has come from Myanmar. Now the fallout is showing up downstream in Thailand’s Kok River. The Straits Times reported on April 11, 2026 that unregulated rare-earth mining in Myanmar is sending heavy-metal pollution into the river and damaging fishing, farming and tourism livelihoods in northern Thailand. This is not one isolated pit. Reporting from the border has described around a dozen extraction sites that appeared in Myanmar’s Shan state from about 2022 in territory controlled by the United Wa State Army, with waste believed to be washing into Thai waterways. Researchers in Thailand have already found arsenic building up in people living along the Kok River, according to the April 2026 Straits Times report. When a supply chain moves its dirtiest step to a war-frayed border, the first warning can arrive as poison in a fishing net or an irrigation canal. Western governments have spent the past few years talking about mines in Australia, the United States and Africa, but mines alone do not solve this problem. The International Energy Agency’s 2025 outlook said concentration in refining has intensified, with the top three refining countries’ combined share rising from about 82 percent in 2020 to 86 percent in 2024. So the current deal buys time, not independence. China can ease pressure for a few months and still keep the leverage that comes from owning the hardest industrial step, while communities along the Myanmar-Thailand border keep paying the environmental bill in water, crops and lost income.