Workers employed by Lakshmi Mittal, Britain’s richest man, are accusing the billionaire of cashing in on “slave labour” conditions after scores have died in accidents in his mines. Coalminers working in Mittal’s Kazakh mines claim his firm is endangering their lives by using dangerous, outdated equipment and by cutting corners. More than 90 have died in the mines since 2004...This weekend Arcelor Mittal, his company, said health and safety was a “top priority” and that it intended to invest £63m improving safety at the mines...“I lost eight close colleagues in the [2006] explosion. Since then nothing has been done to improve safety...” [said Sergei, a Lenina miner].