MP Materials, which runs the only American rare earths mine, announced a new $500 million agreement with tech giant Apple on Tuesday to produce more of the powerful magnets used in iPhones as well as other high-tech products like electric vehicles.

Apple’s investment in the mining company MP Materials will also help the tech giant reduce its dependence on China for rare earth metals.

Apple has signed a $500-million deal with Pentagon-backed MP Materials for a supply of rare earth magnets, one of the first U.S. tech companies to ink an agreement that aims to centralize its supply chain inside the country.