Group 1 - Mountain Pass Materials, the largest rare earth producer in the U.S., announced a partnership with the U.S. Department of Defense and Saudi Arabian Mining Company to build a rare earth refining plant in Saudi Arabia [1] - The plant will process raw materials from Saudi Arabia and other regions, producing heavy and light rare earth products for the manufacturing and defense industries in both the U.S. and Saudi Arabia, as well as for allied countries [1] - The joint venture will have Mountain Pass Materials and the U.S. government holding 49% of the shares, while Saudi Arabian Mining Company will hold at least 51% [1] Group 2 - The U.S. Department of Defense will provide non-recourse funding for the project, while Mountain Pass Materials will supply rare earth separation and refining technology [1] - Mountain Pass Materials, founded in 2017, is the only U.S. company with a complete rare earth supply chain and the only large-scale rare earth mining and processing company in North America [1] - The company owns the Mountain Pass mine in California, which is the second-largest rare earth mine globally, and has a processing facility in Fort Worth, Texas, primarily producing light rare earth products [1] Group 3 - Saudi Arabia is focusing on economic diversification and places high importance on mining, with the Saudi Arabian Mining Company actively developing mineral resources estimated to be worth approximately $2.5 trillion [2] - The company is also exploring overseas opportunities through its international investment arm, Ma'aden [2]