EXHIBIT 1
JOINT FILING AGREEMENT
Each of the undersigned hereby agrees that this Amendment No. 15 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: April 5, 2011
Glencore International AG | ||||
By: | /s/ Barbara Bodmer | /s/ Stefan Peter | ||
Name: | Barbara Bodmer | Stefan Peter | ||
Title: | Officer | Officer | ||
Glencore Holding AG | ||||
By: | /s/ Andreas Hubmann | /s/ Steven Kalmin | ||
Name: | Andreas Hubmann | Steven Kalmin | ||
Title: | Director | Director | ||
Glencore AG | ||||
By: | /s/ Barbara Bodmer | /s/ Stefan Peter | ||
Name: | Barbara Bodmer | Stefan Peter | ||
Title: | Officer | Officer |