PotashCorp BHP Billiton
FILE - This 2007 file photo, shows the inside of the production facility at the Rocanville potash mine owed by the PotashCorp, in Rocanville, Sask. Fertilizer producer Potash Corp. of Saskatchewan Inc. said Tuesday it has rejected an unsolicited takeover bid from BHP Billiton Ltd. worth about $38.49 billion as "grossly inadequate." (AP Photo/The Canadian Press, Troy Fleece, File)