FILING AGREEMENT DATED TO BE EFFECTIVE MAY 3, 2013 REGARDING JOINT FILING OF SCHEDULE 13D

EXHIBIT E

FILING AGREEMENT DATED TO BE EFFECTIVE MAY 3, 2013

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 IV, LP     By: Sentient XX XX, L. P.               its General Partner          By:  Sentient Executive XX XX, Limited,               its General Partner By: /s/ Xxxx Link________ Xxxx Xxxx, Director Date: May 3, 2013		Sentient XX XX, L.P. By: __/s/ Xxxx Xxxx Xxxx Xxxx, Director Date:  May 3, 2013
Sentient Executive XX XX, Limited By: ___/s/ Xxxx Link_____ Xxxx Xxxx, Director Date:  May 3, 2013