Rescue workers walk at the site where the town of Bento Rodrigues stood after two dams burst on Thursday, in Minas Gerais state, Brazil, Sunday, Nov. 8, 2015. Brazilian rescuers are looking for people still listed as missing following the burst of two dams at an iron ore mine which sent viscous red mud, water and debris flooding into the town, flattening all but a handful of buildings and killing dozens. AP Photo
MARIANA, Brazil—Brazilian authorities investigating last week’s fatal collapse of a mine-waste reservoir have ordered operator Samarco to take emergency measures to deal with the catastrophic aftermath, prosecutors said Tuesday.
READ: Brazil shuts mudslide mine in new blow to companies
The announcement came as officials said at least six people were killed in the disaster, raising an earlier death toll of four. Twenty-one people remain missing and 631 displaced.
The company, a joint venture between Australian mining giant BHP Billiton and Brazil’s Vale, has been issued a court order requiring it to collect and preserve evidence related to the dike failures that triggered the deadly mudslide, said prosecutors in the southeastern state of Espirito Santo.
READ: Scores missing as deadly mudslide flattens Brazil village
The measure is aimed at ensuring victims can obtain compensation for the environmental and human damage the incident is causing in the state, prosecutors said.
The firm must also provide a helicopter for an indefinite period of time to inspect areas of the state affected by the nearly 60 million cubic meters (two billion cubic feet) of ochre sludge. Samarco will face a daily fine of 50,000 reals (about $13,000) if it fails to comply.
The mud and mining waste burst through the retaining walls at the Samarco iron ore mine Thursday and flattened most of the nearby village of Bento Rodrigues, in the state of Minas Gerais.
Fears were mounting that the sludge, which has flowed into local rivers, could contaminate the water supplies of more than half a million people in Minas Gerais and neighboring Espirito Santo.
Residents in the area complained of a strong chemical smell coming from the local water. They posted photos on social media of ruined plantations and dead wildlife, including fish and turtles smothered in mud.
Billiton executive to visit
Authorities in Minas Gerais have ordered Samarco to halt operations. The company has put 85 percent of its employees in the two states on paid leave.
The sludge, which has already flowed 400 kilometers (250 miles), was expected to reach Espirito Santo on Tuesday.
The court order also requires state officials in Espirito Santo to test the water of the Rio Doce river for contamination.
Shares in BHP Billiton and Vale have fallen sharply since the disaster.
BHP Billiton’s chief executive Andrew Mackenzie was due to visit the affected area “to understand first-hand the human, environmental and operational impacts of the incident,” the company said.
The cleanup could cost more than $1 billion, Deutsche Bank analysts have warned.
Carlos Eduardo Ferreira Pinto, a state prosecutor specializing in environmental cases, alleged there was “negligence” involved.
“A dike doesn’t break by chance. The responsibility of the company is key,” he told the Globo television network.
“Prosecutors are now trying to judge the scale of the damage so that the public can be compensated.”
Ratings agencies warned that the cut in iron and mineral production after the accident, as well as possible fines it could face if sued, threatened Samarco’s position.
Moodys stripped Samarco of its investment-grade credit score, while Fitch put the firm on negative watch for a possible downgrade.
Threatening legal action, the state prosecution service in Minas Gerais called for Samarco to start paying to rehouse displaced families and to help them start rebuilding their lives.