BHP is largest mining company in world with about $225 Billion Mkt Cap
Vale is second largest mining company in world with about $165 Billion Mkt Cap
Rio Tinto is third largest mining company in world with about $125 Billion Mkt Cap
BHP has property bordering WPX near Kronau, 25 kms SE from Capital city of Saskatchewan - Regina
Vale is right across the road from WPX, and have filed its proposal for $3 Billion solution potash mine.
Rio Tinto now has JV property bordering WPX near Kronau, after a deal that went through with Russian JC Acron subsidiary North Atlantic Potash Corp last month.
Make your own choices, but if you truly believe that neither the #1, #2 or #3 mining companies in entire world (that all border WPX property) won't take out WPX, I think you're wrong.