By Dana Cimilluca and Alex MacDonald 
 

LONDON--Glencore International PLC officially put its revised offer for Xstrata PLC to the miner's board and shareholders, seeking to win their approval for new terms and keep the historic merger deal from turning hostile or collapsing.

Glencore on Monday solidified and expanded on an informal offer it had made to Xstrata's board Friday, in a last-ditch effort to save the deal. The world's biggest commodities trader said that according to its new plan, Xstrata Chief Executive Mick Davis would lead the combined company for six months, before giving way to Glencore CEO Ivan Glasenberg, and that Xstrata chairman John Bond would be permanent chairman. On Friday, Glencore had said only that Mr. Glasenberg would be CEO, rolling back a prior plan for Mr. Davis to take that job.

Switzerland-based Glencore confirmed other aspects of its new plan, including a price of 3.05 Glencore shares for every Xstrata share, up from a prior ratio of 2.8. But Glencore added Monday that it will not raise its offer further.

The move represents the latest chapter in a years-long effort on the part of Mr. Glasenberg to complete a full-takeover of Xstrata, which Glencore helped build into the mining juggernaut that it is today and in which it already owns a 34% stake.

Market reaction to the deal suggests that investors are increasingly confident it will happen. On Monday, Xstrata shares rose 2.4% in midday in London to 1,038.5 pence, and Glencore shares fell just over 1% to 373.86 pence. That puts the closely watched deal ratio at 2.78, nearer to the new offer than it was Friday.

Still, the deal is far from done. Xstrata's reaction to the rough proposal Friday was frosty, with the miner questioning the price and other aspects of the new governance. Before the new offer surfaced, Mr. Glasenberg had offered Mr. Davis the interim CEO role and he rejected it, people familiar with the matter said Friday. It's unclear whether his view has changed.

Xstrata said Monday morning that it will study the particulars of the new offer and, in consultation with its shareholders, decide by Sept. 24 how to proceed.

Xstrata's board faces a delicate dance in deciding whether to accept or reject the new offer. It has been criticized for signing off on a deal in February that Xstrata's shareholders later deemed insufficient, and it doesn't want to be seen as out of sync with their will again. On the other hand, it has stressed in the past the importance of having its management in key roles in the new company, which will garner the bulk of its earnings from Xstrata's coal and other mining operations.

If completed, the tie-up would be the biggest corporate deal of the year, valued on Friday at about $36 billion. It would create a unique mineral extraction and distribution company with a market value of about $75 billion based on current share prices.

Glencore's latest offer came, just as Xstrata shareholders were set to vote on it at a meeting in Zug, Switzerland, on Friday morning. After investors including Qatar Holding LLC, Xstrata's second-biggest shareholder with a 12% stake, came out publicly against the old price, the deal was all but doomed given the high level of shareholder support required under the deal's structure.

Glencore said Monday that the new offer is its "best and final," which under U.K. takeover rules leaves it little or no scope for a further increase.

But Glencore also said it could switch the deal to a takeover offer--instead of a merger--with the consent of the U.K. takeover panel and Xstrata. While it's far from certain that either party would consent to such a move, such a switch would make it easier for Glencore to win shareholder approval. Currently, 75% of Xstrata's non-Glencore shares have to be voted in favor of the deal for it to pass. Glencore isn't allowed to vote. Under a takeover arrangement, however, the deal could be approved by a simple majority of Xstrata shares and Glencore would be allowed to vote.

A contentious aspect of the deal has been a retention package that was originally put in place to keep Xstrata managers at the combined company. The package was revised in June after some Xstrata shareholders said it was too generous.

Glencore said Monday that it was content with the 173 million British pounds ($277 million) package, but called on Xstrata's board to consult with its shareholders to see whether further adjustments should be made.

Xstrata shareholders have to approve both the retention package and the merger itself in separate votes in order for the deal to go ahead. A new vote date has not been set yet.

Opinion among Xstrata shareholders on the new terms so far appears to be mixed.

Standard Life Investments, Xstrata's seventh-largest shareholder, said Friday that it supported the revised offer, while Knight Vinke, a top 30 Xstrata shareholder, said the revised share-swap ratio was insufficient.

Qatar Holding, which remains publicly silent on the matter, is said to be more receptive to the new share-swap ratio, although it has questions about the new governance structure and whether the price is sufficient given that, however it is officially structured, the deal now appears more like a takeover than a merger.

Xstrata said Monday that it has agreed to announce by the morning of Sept. 24 whether or not it intends to put Glencore's increased proposal to shareholders. If so, it will publish its response on all elements of the proposal at that time, the company said.

Write to Dana Cimilluca at Dana.Cimilluca@wsj.com and Alex MacDonald at Alex.MacDonald@dowjones.com

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