STORY: One of the largest lawsuits in English legal history begins on Monday (October 21).

That’s as mining giant BHP faces a multibillion dollar claim over Brazil's worst environmental disaster: the collapse of the Mariana dam in 2015.

The dam contained mining waste and its collapse nine years ago unleashed a toxic wave on the surrounding area.

It killed 19 people, left thousands homeless and flooded forests.

It polluted the length of the Doce River – which is considered to be sacred by the Krenak indigenous tribe.

More than 600,000 Brazilians, 46 local governments, and around 2,000 businesses are suing BHP…

Which owned the dam alongside Vale's joint venture with Samarco.

Claimants are seeking a combined $47 billion in damages.

BHP, the world's biggest miner by market value, is contesting liability.

It says this record London lawsuit duplicates legal proceedings and reparation and repair programs in Brazil.

Adding that nearly $8 billion has already been paid to those affected by the disaster through the Renova Foundation, which was established in 2016.

The miners also said on Friday (October 18) the Brazilian government is discussing a nearly $30 billion compensation deal.

The London High Court hearing will last up to 12 weeks.