By Alex MacDonald and Vanessa Mock

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 refined 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 all-share 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. Glencore and Xstrata have previously said they expected the deal to close by the end of the year.

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 official 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."

The person added 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. Two people familiar with the matter said the extension would be in keeping with normal protocol.

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.

Xstrata owns the San Juan de Nieva zinc refinery in Spain, which is able to produce 511,000 metric tons of zinc metal a year, making it the largest in the world, according to the company. It also owns the Nordenham zinc smelter in northern Germany, which is able to produce 150,000 tons of refined zinc a year.

Glencore owns the Portovesme primary lead and zinc smelter in Sardinia, Italy, which is able to produce 120,000 tons of zinc metal a year. Glencore also markets a significant amount of zinc produced by Belgium-based Nyrstar N.V. (NYR.BT) and owns a minority stake in the company.

"Cancelling the Nyrstar contract is on the light end of the concessions that Glencore might offer," said mining analyst Jeff Largey of Macquarie Research. "Selling the San Juan de Nieva zinc refinery is on the heavy end of that spectrum."

Glencore declined to comment on the matter.

-Write to Alex MacDonald at alex.macdonald@dowjones.com and Vanessa Mock at vanessa.mock@dowjones.com

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