Baogang Tailings Dam

Baogang Tailings Dam, also known as the Baotou Tailings Dam or Weikuang Dam, is a tailings dam in Inner Mongolia, China, on the outer ring of the city of Baotou, about 20 kilometres from the city centre. The dam is filled with tailings and waste slurry from nearby rare earth mineral refinery plants. Accounts of the tailings dam appeared in western media outlets after a visit in 2015 by British writers Tim Maughan, Liam Young and Kate Davies from Unknown Fields, a "nomadic design studio" from London. Footage posted on YouTube by Maughan appears to show him collecting samples from the floor of the dam. Maughan's account contrasts with the Chinese media's own reporting of the rare earth industry in the area. In 2016, Chinese authorities identified contamination of farmlands surrounding the dam. In recent years, the government has engaged in environmental cleanup efforts at the site. However, raised earth embankments around the dam, along with a concrete wall, make it inaccessible to the public. Construction of the dam began in 1955, and it was complete in 1963 but was not used until 1965. It is owned by Baotou Steel. The circular dam is 11.5 km (7.1 mi) long and has a 85,000,000 m3 (69, 000 acre⋅ft) capacity. The dam height will be raised a total of 20 m (66 ft) in two stages to a crest elevation of 1,065 m (3, 494 ft), and the final capacity will be 233,800,000 m3 (189, 500 acre⋅ft)

Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).