By Vanessa Mock and Alex MacDonald

LONDON--The European Commission is concerned that the proposed merger between Glencore International PLC (GLEN.LN) and Xstrata PLC (XTA.LN) could reduce competition in the European zinc metal market and has requested that Glencore provide remedies by midnight Tuesday if it wishes to keep to its timetable, three people familiar with the matter said Tuesday.

Glencore and Xstrata are seeking regulatory and shareholder approval for a proposed tie-up that would create the world's fourth-largest diversified miner with a market capitalization of about $70 billion. From a regulatory perspective, only the European Commission and China's Ministry of Commerce still have to render a verdict.

The two regulators are trying to assess whether the combination of the two companies would lead to the concentration of power in the hands of a few players who could potentially set the price for certain commodities.

An EU person familiar with the negotiations confirmed that the European Commission, the body responsible for reviewing EU competition issues, identified concerns related to the combined company's market share in zinc metal.

The person wasn't able to say whether Glencore had submitted any concessions as yet but said: "We fully expect them to submit remedies by the close of Tuesday." Two other people familiar with the matter voiced similar views.

The three people said they expected the Commission to announce Wednesday morning that the regulator would extend its review deadline from Nov. 8 to Nov. 22 in order to give itself more time to assess whether any concessions from the companies go far enough in addressing its concerns.

Glencore and Xstrata have argued to EU regulators that the zinc metal market is global and the deal should be reviewed within that context. The European Commission previously ruled in Xstrata's 2006 Falconbridge purchase that the zinc market was regional.

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.

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

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