Gina Rinehart-led Hancock Prospecting has proposed a $390 million takeover offer for Atlas Iron, less than a week after purchasing a 19.9 per cent stake in the junior miner.

Gina Rinehart-led Hancock Prospecting has proposed a $390 million takeover offer for Atlas Iron, less than a week after purchasing a 19.9 per cent stake in the junior miner.