At the time,MinRes beat out its rival with an eventual offer of 83 cents a share,which included a mix of cash and scrip.
The rival bid on the table from CERCG was an all-cash offer of73¢ a share,or $463 million.
This was all upended last month whenMitsui made an unsolicited 95 cents a share,all-cash offer.
A source close to the latest deal said there was likely to be significant shareholder support for the proposal.
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“Mitsui has got plenty of strength,so its bid should be attractive to shareholders as they are getting cash and they don’t have to rely on scrip,” he told Fairfax Media.
AWE chairman Ken Williams welcomed the Japanese firm’s involvement in the company.
“The Mitsui proposal,being all cash and pitched at a significant premium to the competing offer received by the AWE board,represented a superior value proposition,” Mr Williams said.
AWE chief executive David Biggs added that it was satisfying to see the value of Waitsia recognised.
As part of the rejection of the MinRes deal,AWE will have to pay a $6 million break fee.
MinRes was approached for comment.
Rothschild is acting as financial adviser and Herbert Smith Freehills is legal adviser to Mitsui.
AWE last traded at 98.5 cents a share,a 3.68 per cent increase on Mitsui’s 95 cents a share bid.