The iPhone maker is committing $500 million to buying rare-earth magnets from the company’s flagship facility in Texas, which Apple is helping to build out.

Apple said on Tuesday it would invest $500 million into rare earths mine operator MP Materials , as the iPhone maker seeks to localize its mineral supply chain.

Apple has committed $500 million to buying recycled rare earth magnets from MP Materials, a mining company with a major manufacturing hub in far north Fort Worth. MP Materials plans to "significantly expand" the Fort Worth facility's capacity as part of the deal,