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

MP Materials, the operator of the only rare earths mine in the United States, has signed a $500 million deal with Apple.

Apple has signed a $500-million deal with Pentagon-backed MP Materials for a supply of rare earth magnets, becoming one of the first tech companies to ink a U.S. supply agreement after China curbed exports earlier this year.