Mining giant BHP Billiton PLC is facing a multibillion-pound lawsuit over the Samarco dam catastrophe in Brazil in one of the largest claims in British legal history... The class action, which is being handled by SPG Law, counts more than 240,000 claimants... In 2015, BHP's Samarco iron-ore mine in the Minas Gerais state in south eastern Brazil saw a dam collapse, killing 19 people and displacing 700...A torrent of mud unleashed by the burst also wiped out a small village, Bento Rodrigues, and contaminated the Atlantic Ocean...