JOINT FILING AGREEMENT
EXHIBIT 99.1
Each of the undersigned hereby agrees that this Amendment No. 13 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.
Dated: June 10, 2013
Glencore AG
| By: | /s/ Xxxxx Xxxxxxxx | ||
| Name: | Xxxxx Xxxxxxxx | ||
| Title: | Officer | ||
| By: | /s/ Xxxxxxx Xxxxxx | ||
| Name: | Xxxxxxx Xxxxxx | ||
| Title: | Officer |
Glencore International AG
| By: | /s/ Xxxxxx Xxxxxx | ||
| Name: | Xxxxxx Xxxxxx | ||
| Title: | Officer | ||
| By: | /s/ Xxxxxxx Xxxxxx | ||
| Name: | Xxxxxxx Xxxxxx | ||
| Title: | Officer |
Glencore Xstrata plc (formerly known as Glencore International plc)
| By: | /s/ Xxxx Xxxxxx | ||
| Name: | Xxxx Xxxxxx | ||
| Title: | Company Secretary and Officer |
