One portal to view them all, one portal to bind them (tailings dams).
Excavations were part of early construction works to buttress the NTSF wall.
Vale sounds the alarm to avert another tailings dam collapse in Minas Gerais.
Estimated to take three years and will stop production of 40 million tonnes per annum.
Increased slope stability radar monitoring implemented.
Operations at site suspended since March 10.