good calculations but wait there's more

Good calculation attempt. whilst we must remember this is for Lake Wells only with other opportunities at there other holdings as well. with current global prices for Potash and any similar fertilizer this stock will no doubt hit a minimum $5 depending on the depths of the other lakes could easily surplus $10. You have to look at the big picture as overseas Potash companies in Canada to Africa offer shares for $22 upwards into the $100 + range will our Aussie leaders Rio Tinto and BHP being major importers of Potash into the country.
Being in Agriculture myself the demand and then a local supply is significant. I actually believe this is being underplayed and the results will be much more rosier than punters think.