They've never taken out a settlement the size of a city but there have been a couple of tailings dam collapses in recent years that have led to the deaths of (in one case) 270 people and (in the other) displacements of hundreds of people, along with widespread downstream pollution:

https://en.wikipedia.org/wiki/Brumadinho_dam_disaster

https://en.wikipedia.org/wiki/Mariana_dam_disaster

Then of course there's the drying up of the Aral Sea starting in the second half of the 20th century, due primarily to the diversion of the rivers that feed it for the purpose of irrigation, which has had a devastating effect on the surrounding communities that used to depend on it:

https://en.wikipedia.org/wiki/Aral_Sea