Exhibit E
Joint Filing Agreement
We, the undersigned, hereby express our agreement that the attached Schedule 13D is, and any further amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. This agreement may be terminated with respect to the obligations to jointly file future amendments to such statement on Schedule 13D as to any of the undersigned upon such person giving written notice thereof to each of the other persons signatory hereto, at the principal office thereof.
Dated: September 27, 2013
| OCI COMPANY LTD. | ||
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| By: | /s/ Woohyun Lee | |
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| Name: | Woohyun Lee |
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| Title: | President and Chief Executive Officer |
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| OCI ENTERPRISES INC. | ||
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| By: | /s/ Kirk H. Milling | |
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| Name: | Kirk H. Milling |
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| Title: | President and Chief Executive Officer |
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| OCI CHEMICAL CORPORATION | ||
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| By: | /s/ Kirk H. Milling | |
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| Name: | Kirk H. Milling |
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| Title: | President and Chief Executive Officer |
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| OCI WYOMING HOLDING CO. | ||
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| By: | /s/ Kirk H. Milling | |
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| Name: | Kirk H. Milling |
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| Title: | President and Chief Executive Officer |
