And the simple reason why China dominates rare earth refining: it is big enough to store all the toxic byproducts. The world's largest REE mine, Bayan-Obo has produced over 70,000 tons of radioactive thorium stored in the area. But, the tailing pond lacks proper lining. As a result, its contents have been seeping into groundwater and will eventually hit the Yellow River a key source of drinking water for residents in 50 medium and large cities.

https://nitter.poast.org/zerohedge/status/1985576218364707207#m