The Brazilian claimants are seeking compensation for alleged damage to their homes and livelihoods.
BHP’s potential damages bill,first estimated at £5 billion ($9 billion),may now be as high as £36 billion ($65 billion),according to law firm Pogust Goodhead.
In a statement on Thursday,BHP said it had not yet received full details of the revised claim,while the damages being sought “remains unspecified”.
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The company said its provision related the Fundao dam failures was $US3.1 billion ($4.7 billion) as of December 31.
“Given the status of the English proceedings,it is not possible to provide a range of possible outcomes or a reliable estimate of potential future exposures to BHP in connection with these proceedings,” it said.
“BHP will continue to defend the English Proceedings which it believes are unnecessary because they duplicate matters already covered by the existing and ongoing work of the Renova Foundation and legal proceedings in Brazil.”