Looks like mining to me. While it reminds me of the tailing ponds from the tar sands in Fort McMurray, a real Hell on Earth was Vale SA's tailings dam collapse

Looks like mining to me. While it reminds me of the tailing ponds from the tar sands in Fort McMurray, a real Hell on Earth was Vale SA's tailings dam collapse in Brumadinho that devastated the downstream villages of Bento Rodrigues and Paracatu de Baixo.