Horses struggle in the mud in the small town of Bento Rodrigues, Minas Gerais, Brazil after a dam burst on Friday, Nov. 6, 2015. Mud flowed into the village 4 miles (7 kilometers) downhill from the Samarco iron ore mine in the mountainous area. AP Photo
MARIANA, Brazil鈥擣irefighters rescued 500 survivors Friday from a torrent of mining waste that killed at least 17 people and destroyed a village after two dams burst in southeastern Brazil.
READ: Mine dams burst in Brazil; 1 dead, homes covered in mud
They searched frantically for survivors after the mudslide erupted Thursday from waste reservoirs at the partly Australian-owned iron ore mine in southeastern Brazil.
The torrent ripped the roofs off houses and left villagers clinging to their roofs.
鈥淭here was a horrible noise and we saw the mud approaching. We ran for it. It is a miracle that we are still alive,鈥� said Valeria de Souza, 20, with a baby in her arms and tears in her eyes.
READ: Dam bursts at mine in southeastern Brazil, submerging homes
The mudslide flattened Bento Rodrigues, a village of some 600 people near the southeastern city of Mariana in the historic mining region of Minas Gerais.
De Souza spoke to AFP after arriving at a gymnasium in Mariana, where some 150 survivors from the destroyed village were being housed.
There were 17 people officially confirmed killed and 50 injured, 鈥渂ut more bodies have been found,鈥� said Adao Severino Junior, the fire chief in Mariana.
He warned that more than 40 people could be missing.
鈥淭here is no way to survive under that material,鈥� he said of the mudslide.
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鈥楨normous鈥� environmental damage
Firefighters said they had rescued 500 people who were covered in iron and mineral deposits that were then washed off.
The local Mariana miners鈥� union said the sludge was toxic, but the company operating the mine, Samarco, said it was 鈥渋nert鈥� and contained no harmful chemicals.
Officials and experts said the mud threatened nearby wildlife.
鈥淭he environmental damage is enormous,鈥� said one of the state prosecutors investigating the disaster, Carlos Ferreira Pinto.
Most of the village鈥檚 inhabitants work for Samarco, jointly owned by BHP Billiton of Australia and Vale of Brazil.
Samarco said the causes of the rupture were not known.
Experts at Sao Paulo University鈥檚 Seismology Center said four small earthquakes were recorded in the region on Thursday, though it was unlikely such small tremors would break a dam.
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Fleeing over rooftops
Shares in Vale and BHP Billiton plunged Friday on the Sao Paulo and London stock exchanges.
The president of Samarco, Ricardo Vescovi, said the company was 鈥渕obilizing absolutely all necessary efforts鈥� to help people struck by the disaster.
鈥淲e are also not sparing efforts to contain the environmental damage,鈥� he said in a video message.
Minas Gerais has been Brazil鈥檚 main mining hub since the 16th century. First came gold, then mining of iron ore, other minerals and semi-precious stones.
Mariana and the nearby village of Ouro Preto sent firefighters and ambulances. Mariana residents donated mattresses, clothes, food and water for the stricken villagers.
The head of Samarco鈥檚 emergency planning operations, Germano Silva Lopes, told a news conference the company had detected a tremor but no anomalies in the dams before they burst.
He said the first ruptured reservoir contained 55 million cubic meters of iron mineral deposits鈥攍ess than its full capacity. All of it flooded out into the adjoining valley on Thursday afternoon.
A second dam holding back seven million cubic meters of waste broke shortly afterwards.
Vescovi said the company鈥檚 emergency procedures were correctly听carried out but 鈥渨e could improve them.鈥�
Fifteen-year-old Marcos Junior de Souza told the Folha de Sao Paulo newspaper that he fled across the rooftops to escape the torrent.
鈥淎ll my life I had heard people saying the dam was going to break,鈥� he was quoted as saying. 鈥淚 never thought much of it until the water flooded my house.鈥�