BHP to face 620,000 claimants in Mariana dam collapse trial in London

Claimants seeking damages from Anglo-Australian mining company over 2015 environmental disaster in Brazil

The mother of a seven-year-old boy who was torn from the arms of his grandmother and drowned in one of Brazil's worst environmental disasters is among more than 620,000 claimants who will have their case heard this month in the largest group claim in English legal history.

Gelvana Aparecida Rodrigues da Silva, 37, lost her son Thiago on 5 November 2015 when the Fundao dam, near Mariana in eastern Brazil, collapsed, releasing about 50m cubic metres of toxic waste.