Eurasian Natural Resources Corporation is set to make a dramatic entry into the top third of the FTSE 100 this week just three months after the Kazakh mining group listed in London, in spite of having a free float of less than 25 per cent.

ENRC shares have risen more than 80 per cent since they listed at 540p a share in December thanks to the soaring prices of iron ore, aluminium and ferrochrome, the group's main products.