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The German company Tuv Sud had recommended Vale not to make any detonations near the dam I, Córrego do Feijão, Vale, in Brumadinho, in the metropolitan area of Belo Horizonte, which broke out on January 25th. The experts and experts who joined the working group will investigate whether explosions in neighboring mines have contributed to the liquefaction of dam B1, where, according to researchers, there were already signs of saturation, water in the ore residues.
This recommendation is contained in a report on the periodic tank survey done by Tuv South in June 2018. There was a "recommendation for the adoption of measures to reduce the risk of triggering. vibration, prohibit nearby detonations, avoid heavy material traffic in the dam, prevent the raising of water level in the tailings. "
During investigations, police badyzed documents and confronted statements by the company's engineers attesting to the stability of those of Vale's employees.
In his testimony to the working group, Rodrigo Gomes de Melo, executive director of the complex where the dam is located, said that he was aware of the detonations that occurred at the Jangada and Feijão mines, which were common and unfolded almost every day, could affirm the periodicity.
The information beats that of another Vale employee, Ricardo de Oliveira – responsible for the environment. In his testimony, he stated that explosions and detonations in the mine were part of the exploration process. but he could not say whether the detonations could in any way affect the liquid wastes in the dam.
B1 Dam, located in the Beech Creek complex in Vale, was located near the Jangada mine, which is also owned by Vale.
The seismological observatory of the University of Brasilia identified 754 explosions during a period of 6 months before the date of the rupture of the dam, January 25, within a radius of 10 20 km around the dam. Still according to the observatory, these detonations alone would not be enough to cause the breakage of a well-structured dam.
Photos and videos included in the survey would indicate that the dam had defects in the drainage system. A satellite photo shows that there was a pond on a part of the tank. One of these videos shows an improvised barrier to prevent the arrival of water from the source to the barrage body.
Vale stated that the presence of a detonation was inherent in mining activities. According to the company, these activities were carried out in a controlled manner at the mines of Córrego do Feijão and Jangada and complied with the audit recommendations. The mining company again stated that it was working with the authorities.
He also said that there was no increase in the level of the mbad of the Brumadinho dam, but rather a reduction in the level of water in the main part of the structure. In 2018, deep horizontal drains were installed as an additional safety measure. After that, an inspection was carried out throughout the dam and no anomalies were detected.
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