About 700 people have been evacuated from towns near two dams in Brazil's Gerais state following safety concerns.
Mining firm Vale said it has moved 500 people living close to Gongo Soco dam in Barão de Cocais.
A further 200 near Serra Azul dam in Itatiaiuçu were moved by ArcelorMittal, which runs both dams with Vale. They are used to store waste from mining.
It follows the collapse last month of another Vale-run dam, leaving over 150 people dead and almost 200 missing.
Residents have been moved into temporary accommodation.
Vale said Brazil's National Mining Agency (ANM) had ordered the evacuations as a precaution after it was discovered that a certificate guaranteeing stable conditions had not been issued for Gongo Soco dam.