Combination photo shows the logos of Glencore and Xstrata at their headquarters in Zug

Reuters
Combination photo shows the logos of Glencore and Xstrata at their headquarters in Zug
A combination photo shows the logo of Glencore (R) in front of the company's headquarters in the Swiss town of Baar and the logo of Swiss mining company Xstrata (L) at their headquarters in Zug, both pictures taken November 13, 2012. REUTERS/Michael Buholzer
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