JOINT FILING AGREEMENT
EXHIBIT
1
Each of the undersigned hereby agrees
that this Amendment No. 6 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: February 3, 2009
Glencore
Investment Pty Ltd
By: /s/
Xxxxxxx X. Xxxx
Name: Xxxxxxx
X. Xxxx
Title: Attorney-in-Fact
Glencore
Investments AG
By: /s/
Xxxxxxx X. Xxxx
Name:
Xxxxxxx X. Xxxx
Title: Attorney-in-Fact
Glencore
International AG
By: /s/
Xxxxxxx X. Xxxx
Name: Xxxxxxx
X. Xxxx
Title: Attorney-in-Fact
Glencore
Holding AG
By: /s/
Xxxxxxx X. Xxxx
Name: Xxxxxxx
X. Xxxx
Title: Attorney-in-Fact