Potash Corp. sues Mosaic in clash over potash reserves at Esterhazy mine February 19, 2010 By investing Leave a Comment Potash Corp. sues Mosaic in clash over potash reserves at Esterhazy mine SASKATOON – Two mining giants will likely face off in court after Potash Corp. of Saskatchewan launched a lawsuit against Mosaic Potash Esterhazy Ltd. Read more on Canoe Money