Three years after the country’s worst environmental disaster, in which 19 people died, Lucy Lamble hears how Letícia Oliveira is still campaigning for justice for the people affected

When Letícia Oliveira was growing up near Mariana in eastern Minas Gerais, the local economy revolved around mining. She had always been interested by the impact of dams on communities, and was at a meeting on the threats they pose when news broke that the Fundão dam had collapsed, unleashing a wave of destruction that contaminated the Rio Doce and killed 19 people. Local people are still struggling to get proper compensation and the new homes they were promised, she tells Lucy Lamble

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