JOINT FILING AGREEMENT

Exhibit A

JOINT FILING AGREEMENT

     The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that it knows or has reason to believe that such information is inaccurate. This Agreement may be executed in any number of counterparts and all of such counterparts taken together shall constitute one and the same instrument.

Dated: February 14, 2008	VEDANTA RESOURCES PLC
	By:	/s/ Xxxxxx Xxxxx Xxxxx
		Name:	Xxxxxx Xxxxx Xxxxx
		Title:	Managing Director and CEO
Dated: February 14, 2008	VEDANTA RESOURCES HOLDINGS LIMITED
	By:	/s/ Xxxx Xxxxxxx
		Name:	Xxxx Xxxxxxx
		Title:	Director
Dated: February 14, 2008	TWIN STAR HOLDINGS LIMITED
	By:	/s/ Xxxxx Xxxx
		Name:	Xxxxx Xxxx
		Title:	Director
Dated: February 12, 2008	VOLCAN INVESTMENTS LIMITED
	By:	/s/ E. Xxxxx Xxxxxx
		Name:	E. Xxxxx Xxxxxx
		Title:	Director/Elco [Secretary] Ltd.
Dated: February 12, 2008	XXXX XXXXXXX DISCRETIONARY TRUST
	By:	/s/ E. Xxxxx Xxxxxx
		Name:	E. Xxxxx Xxxxxx
		Title:	Director/(Onclave PTC Limited, Trustee)

Dated: February 12, 2008	ONCLAVE PTC LIMITED
	By:	/s/ E. Xxxxx Xxxxxx
		Name:	E. Xxxxx Xxxxxx
		Title:	Director
Dated: February 14, 2008	XXXX XXXXXXX
		/s/ Xxxx Xxxxxxx