A quiet shift is taking place at the very top of the global aluminum supply chain. Guinea, the world’s largest bauxite producer, plans to announce new export control measures in June. The goal is not to stop exports, but to manage volumes and push prices back to what the government sees as a more reasonable level. Bauxite sits at the starting point of the aluminum chain. It is processed into alumina, which is then used to produce primary aluminum. If bauxite starts to be repriced, the impact will not stop at the mine gate. Alumina, primary aluminum and downstream aluminum products will all have to recalculate their costs. Why Guinea Is Acting Guinea is not short of bauxite. The issue is that it may have been selling too much, too cheaply. In 2025, Guinea’s bauxite exports rose 25% to about