$WPX.TO - Western Potash Corp. Delivers Feasibility Study with After-tax $2.44 B NPV, 18.6% IRR, 5.6 year Payback and Declares Reserves at Milestone http://www.westernpotash.com/news/western-potash-corp-delivers-feasibility-study-after-tax-244-b-npv-186-irr-56-year-payback-and