By Alex MacDonald

LONDON--The European Commission said Wednesday it has extended the review of Glencore International PLC's (GLEN.LN) $70 billion merger proposal with Xstrata PLC (XTA.LN), after Glencore submitted remedies to allay EU competition concerns.

The Commission said on its website that the deadline for reviewing the all-share deal to create the world's fourth-largest diversified miner has been extended to Nov. 22 from Nov. 8 after the commodities titan submitted concessions to the EU. The Commission said the areas of concern involved the mining of hard coal and other non-ferrous metals.

The anti-trust regulator didn't disclose which specific metals or ore it had expressed concern over. Nor did it disclose the remedies that Glencore submitted Tuesday but an EU official familiar with the review said the concerns were focused on the combined company's market share in refined zinc metal.

The combined company would be the world's largest zinc miner and the fifth-largest exporter of hard coal--which is used to make steel should the deal close by the end of December, as expected.

Analysts and arbitrage funds alike expected the Commission to raise concerns about the combined company's market concentration in refined zinc metal--given a 2006 commission ruling which determined that the zinc market operates on a regional basis rather than a global basis.

Glencore and Xstrata would have a combined market share of about 50% in European zinc metal, according to Macquarie Research calculations. This compares to a 9.1% market share in the global zinc metal market, according to UBS calculations.

A Glencore spokesman declined to comment.

Write to Alex MacDonald at alex.macdonald@dowjones.com

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