Junior sulfate of potash producer SOPerior Fertilizer Corp., (formerly Potash Ridge Corp.), Toronto, said on May 29 it has added Ian Smith, B.Com., to the board of directors. It said Smith, an experienced mining engineer, has over 45 years of experience in corporate operations, project management, and consulting internationally. He was president and founding partner of MRDI, a North American mining consultancy company that was ultimately purchased by Canadian interests in 1995.