JOINT FILING AGREEMENT
EXHIBIT 99.1
Each of the undersigned hereby agrees that this Amendment No. 18 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: September 19, 2016
| Glencore AG | ||
| By: | /s/ Xxxxxx Xxxxxx | |
| Name: | Xxxxxx Xxxxxx | |
| Title: | Officer | |
| By: | /s/ Xxxxxxx Xxxxx | |
| Name: | Xxxxxxx Xxxxx | |
| Title: | Officer | |
| Glencore International AG | ||
| By: | /s/ Xxxxxx Xxxxxx | |
| Name: | Xxxxxx Xxxxxx | |
| Title: | Officer | |
| By: | /s/ Xxxxx Xxxxxxxx | |
| Name: | Xxxxx Xxxxxxxx | |
| Title: | Officer | |
| Glencore plc | ||
| By: | /s/ Xxxx Xxxxxx | |
| Name: | Xxxx Xxxxxx | |
| Title: | Company Secretary | |
