JOINT FILING AGREEMENT
EXHIBIT 1
Each of the undersigned hereby agrees that this Amendment No. 15 to the statement on Schedule 13D is being filed with the Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.
Dated: April 5, 2011
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By:
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/s/ Xxxxxxx Xxxxxx
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/s/ Xxxxxx Xxxxx
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Name:
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Xxxxxxx Xxxxxx
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Xxxxxx Xxxxx
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Title:
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Officer
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Officer
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Glencore Holding AG
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By:
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/s/ Xxxxxxx Xxxxxxx
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/s/ Xxxxxx Xxxxxx
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Name:
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Xxxxxxx Xxxxxxx
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Xxxxxx Xxxxxx
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Title:
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Director
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Director
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Glencore AG
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By:
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/s/ Xxxxxxx Xxxxxx
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/s/ Xxxxxx Xxxxx
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Name:
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Xxxxxxx Xxxxxx
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Xxxxxx Xxxxx
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Title:
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Officer
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Officer
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