JOINT FILING AGREEMENT
Exhibit 99.1
Each of the undersigned hereby agrees that this Amendment No. 21 to the statement on Schedule 13D is being filed with the Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.
Dated: September 14, 2017
| Glencore AG | |||
| By: | /s/ Xxxxx Xxxxxxx | ||
| Name: | Xxxxx Xxxxxxx | ||
| Title: | Officer | ||
| By: | /s/ Xxxxxxx Xxxxx | ||
| Name: | Xxxxxxx Xxxxx | ||
| Title: | Officer | ||
| Glencore International AG | |||
| By: | /s/ Xxxxx Xxxxxxxx | ||
| Name: | Xxxxx Xxxxxxxx | ||
| Title: | Officer | ||
| By: | /s/ Xxxxx Xxxxxxxx | ||
| Name: | Xxxxx Xxxxxxxx | ||
| Title: | Officer | ||
| Glencore plc | |||
| By: | /s/ Xxxx Xxxxxx | ||
| Name: | Xxxx Xxxxxx | ||
| Title: | Company Secretary | ||
