This weekend news hit of a tailings dam collapse at a mine owned by Vale in Brumadinho, Brazil. From the initial reports and photos coming out of the area the damage looked immense.
Because news reports were sparse on geospatial details that show the extent of the disaster, I started looking around for some data and put together this before/after visualization based on imagery by Planet.
The extent of the affected area looks to cover around 240 hectares (2.4sq.km), and the flood has destroyed large swaths of infrastructure in its path, including buildings, bridges, roads, and a smaller reservoir nestled in the valley downstream. Here are the before and after images, each white square is an area of 100 by 100 meters: