JOINT FILING AGREEMENT
EXHIBIT 99.1
Each of the undersigned hereby agrees that this Amendment No. 10 to the statement on Schedule 13D is being filed with the United States Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the United States Securities Exchange Act of 1934, as amended.
Dated: December 6, 2011
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Glencore AG
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By:
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/s/ Xxxxxxx Xxxxxxx
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Name:
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Xxxxxxx Xxxxxxx
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Title:
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Director
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By:
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/s/ Xxxxxxx Xxxxxx
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Name:
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Xxxxxxx Xxxxxx
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Title:
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Officer
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Glencore International AG
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By:
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/s/ Xxxxxxx Xxxxxxx
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Name:
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Xxxxxxx Xxxxxxx
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Title:
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Director
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By:
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/s/ Xxxxxxx Xxxxxx
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Name:
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Xxxxxxx Xxxxxx
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Title:
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Officer
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By:
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/s/ Xxxxxx Xxxxxx
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Name:
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Xxxxxx Xxxxxx
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Title:
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Director
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