While it's unclear what caused the dam to collapse, an investigation is under way.
At least 110 people have died following the mine collapse, with a further 238 missing in the town located in the state of Minas Gerais. Vale described the study as a routine disaster preparation plan required by regulators.
A local official said evidence suggested the collapse, at a mine owned by Brazilian company Vale SA, was caused by liquefaction.
A number of experts and legislators claim that lax regulations and chronic short staffing made the devastating collapse of the dam in southeastern Brazil all but destined to happen.
Located in Minas Gerais state, Brumadinho is 450 kilometers (279.6 miles) north of Rio de Janeiro.
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The study envisaged that sirens would alert workers if the dam burst.
Vale said in a statement that the plan was "built on the basis of technical studies of hypothetical scenarios in the event of a breach" although it did not directly reference Folha's story. The sledge caused by the dam collapse tracked straight for Vale's cafeteria, where numerous workers were eating lunch.
The owner of the dam, Vale, said in a press conference that the majority of the victims were employees.
Vale Chief Executive Fabio Schvartsman has said the miner built its facilities to comply with regulations and that equipment had shown the dam was stable.
Vale is linked to another dam disaster in the same region in 2015.