National mining agency Agência Nacional de Mineração (ANM) had flagged the move several weeks ago.

ANM said the resolution banned the construction of new upstream tailings dams and set a deadline of August 15, 2021, for existing upstream dams to be decommissioned or removed.

It referred to other recent tailings dam failures including Samarco Mineração and Mount Polley in Canada and said the upstream, cheaper form of construction that used tailings to raise dam walls could "no longer be tolerated".

"In this way, ANM proposes some measures that will safeguard the Brazilian society from possible ruptures of these structures, allowing mining to continue playing a vital role for the development of society and the many mining municipalities that we have in the country," the agency said in a translated statement.

It said all miners must complete studies by August 15 this year identifying ways to reduce water supply to their tailings dams, regardless of the construction method.

The official death toll from the Brumadinho disaster late Sunday stood at 169 with 141 people still missing.

Vale has this month evacuated hundreds of people near its Mar Azul mine and the Sul Superior dam, both in Minas Gerais, as concerns were raised about those tailings dams.

Vale shares have slid 11.27% year-to-date while the 62% iron ore price has risen from US$75 per tonne prior to the disaster to a high of $91.50/t earlier this month, according to MySteel.