RE:RE:RE:wpxJust to be crystal clear before someone jumps all over me. the NPV is the net present value of future cash flows of the mine operation profits at assumed costs vs price per tone on the open market for potash. This valuation model takes into account a vast array of financial variables which effect the profitability of the operation over the life of the mine excluding proving the unproven reserves identified in the FS. The formula is simply what will you pay today to earn a $1 tomorrow and at what discount to provide a measure of protection against unforeseen risks relative to similar investments. After all, these majors have a multitude of commodities to invest their $$ in.