It was the second Vale dam to collapse after a similar incident at Samarco in Minas Gerais in 2015. The Samarco incident killed 19 people, unleashing a mixture of mud and tailings into the state's rivers and waterways. Vale acknowledged that it failed to register the declaration of stability for the Santana dam in the city of Itabira in Minas Gerais state. This dam was put on a level 1 emergency alert level in October last year. The Brazilian Regulator's most recent Document Banning the dams is here Read more Mining Safety News