Brazil's national mining regulator Agência Nacional de Mineração said that Vale SA's B-5 tailings dam poses no reason for concern, Reuters reported, citing a statement from the agency.
The agency said it visited the dam and found some minor superficial irregularities due to animals and a makeshift motocross course, but it was structurally sound.
ANM said the B-5 dam "does not have any relevant structural anomalies that merit concerns."
Television program Jornal da Band previously reported that prosecutors of the Minas Gerais state, where the dam is located, asked the company to hire independent auditors as cracks were found in the structure.
B-5 is near the town of Brumadinho, where the tailings dam of Vale's Feijao iron ore mine burst in January.