JOINT FILING AGREEMENT
EXHIBIT 99.1
Each of the undersigned hereby agrees that this Amendment No. 12 to the statement on Schedule 13D is being filed with the United States Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the United States Securities Exchange Act of 1934, as amended.
Date: April 15, 2013
| Glencore AG | ||
| By: | /s/ Xxxxxxxx Xxxxxxx | |
| Name: | Xxxxxxxx Xxxxxxx | |
| Title: | Officer | |
| By: | /s/ Xxxxxx Xxxxxxx | |
| Name: | Xxxxxx Xxxxxxx | |
| Title: | Officer | |
| Glencore International AG | ||
| By: | /s/ Xxxxxxx Xxxxxxxx | |
| Name: | Xxxxxxx Xxxxxxxx | |
| Title: | Officer | |
| By: | /s/ Xxxxxx Xxxxxxx | |
| Name: | Xxxxxx Xxxxxxx | |
| Title: | Officer | |
| Glencore International plc | ||
| By: | /s/ Xxxxxx Xxxxxx | |
| Name: | Xxxxxx Xxxxxx | |
| Title: | Director | |
