FILING AGREEMENT DATED TO BE EFFECTIVE AUGUST 22, 2007 REGARDING JOINT FILING OF SCHEDULE 13D

EXHIBIT V

FILING AGREEMENT DATED TO BE EFFECTIVE AUGUST 22, 2007
REGARDING JOINT FILING OF SCHEDULE 13D

The undersigned hereby agree that:

(i) Each is eligible to use the Schedule 13D attached hereto;

(ii) The attached Schedule 13D is filed on behalf of each of the undersigned; and

(iii) Each of the undersigned is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information therein concerning itself; but none of them is responsible for the completeness and accuracy if the information concerning the other persons making the filing, unless it knows or has reason to believe that such information is inaccurate.

Sentient Global Resources Fund I, L.P.						Sentient Global Resources Trust No. 1
By: Sentient Executive GP I, Limited,						By; Sentient (Aust) Pty. Limited,
On Behalf of The General Partner						As Trustee
By:		/s/ Xxxx X. Xxxxxxx Xxxx X. Xxxxxxx, Director				By:		/s/ Xxxxx Xxxxxxx Xxxxx Xxxxxxx, Director
Date: August 29, 2007						Date: August 29, 2007
Sentient USA Resources Fund, L.P.						Sentient USA Resources Fund II, L.P.
By: Sentient Executive MLP1, Limited,						By: Sentient Executive MLP1, Limited,
General Partner						General Partner
By:		/s/ Xxxx X. Xxxxxxx Xxxx X. Xxxxxxx, Director				By:		/s/ Xxxx X. Xxxxxxx Xxxx X. Xxxxxxx, Director
Date: August 29, 2007						Date: August 29, 2007
Sentient Global Resources Fund II, L.P.						Sentient Global Resources Trust II
By: Sentient Executive GP I, Limited,						bY: Q & H Corporate Services, Ltd.
On Behalf of The General Partner						As Trustee
By:		/s/ Xxxx X. Xxxxxxx Xxxx X. Xxxxxxx, Director				By:		/s/ Xxxxxxxx Xxxxx Xxxxxxxx Xxxxx, Director
Date: August 29, 2007						Date: August 29, 2007

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