In one of Brazil's worst environmental disasters, an iron-ore mine run by a firm co-owned by BHP unleashed a deluge of toxic mud into villages, fields, rainforest, rivers and the ocean, killing 19 people.

In November, the High Court in London found BHP "strictly liable" for the disaster following a mammoth trial, which could lead to billions of dollars in damages shared among 620,000 plaintiffs.

"We are demanding what is owed to us," Marilda Lyrio de Oliveira, from Aracruz in the state of Espirito Santo, told AFP on Wednesday.

"We hope for a just outcome, because the impact was enormous, the crime was enormous.

"Many people are dying of cancer, something that didn't exist before," added Lyrio de Oliveira, representing the region's Indigenous people, as she stood alongside about a dozen other victims attending court.

"We have physical and mental health problems because we can no longer carry out our former activities," she added.

The two-day hearing aims to set the timetable for the compensation trial, which could begin in October or the first half of 2027, the law firm Pogust Goodhead, representing the plaintiffs, told AFP.

Dissatisfied with the proceedings in Brazil, the victims turned to the British courts two years ago, seeking pound36 billion ($49 billion) in compensation.

At the time of the disaster, one of BHP's global headquarters was in Britain.

"The suffering was so immense that it shattered our lives and interrupted our dreams," Ana Paula Auxiliadora Alexandre, who lost her husband in the tragedy, told AFP on Wednesday.

"For ten years, we fought for justice. The fact that a mega-corporation has been convicted here in England makes me think that the British justice system is more diligent than the Brazilian one," she added.

The mine was managed by Samarco, co-owned by BHP and Brazilian miner Vale.

The trial at the High Court in London ran from October 2024 to March 2025.