She cited unpublished information from Vietnam's Ministry of Natural Resources and Environment, which did not respond to requests for comment. In recent years, Japanese investors Toyota Tsusho and Sojitz abandoned projects at Dong Pao after China ramped up supply, pummelling prices. Reuters GraphicsStill, rare earths at Dong Pao are relatively easy to access and are mostly concentrated in bastnaesite ores, according to the Hanoi University of Mining and Geology. The plant has capacity to process 5,000 tons of REO a year but the company plans to treble that to accommodate input from Dong Pao, Tuan said. The metallization process is controlled by China, which produces 90% of rare-earth metals, according to the U.S. Department of Energy.

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Persons: Dong Pao, Blackstone, VTRE, Tessa Kutscher, Anh Tuan, Joe Biden, Kutscher, Sojitz, Dylan Kelly, Vingroup, Rivian, Dong, Tuan, David Merriman, John Rockhold, Dudley Kingsnorth, Francesco Guarascio @fraguarascio, Khanh, Melanie Burton, Trevor Hunnicutt, Mai Nguyen, Phuong, David Crawshaw Organizations: REUTERS, Australia's Blackstone Minerals Ltd, Vietnam's Ministry of Natural Resources, Earth JSC, U.S, . Geological Survey, Reuters, Toyota, Terra Capital, Blackstone, Hanoi University of Mining, REO, White House, Department of Commerce, U.S . Chamber of Commerce, Strategic, ASM, Reuters Graphics Reuters, U.S . Department of Energy, Western Australian School of Mines, Curtin University, Thomson Locations: Nam, Lai Chau, Vietnam, Pao, HANOI, Dong, Beijing, China, Hanoi, U.S, Dong Pao, VTRE, South, Khanh Vu, Melbourne, Seoul, Washington, Phuong Nguyen