Ann: Maiden resource drilling completed at Oxley Potash Project, page-2

Good to see the results. But I don't understand that when they come to mention the Scoping study they talk about the high value potassium nitrate fertiliser, but then they talk about the cost of production as being "..... cost range between $US148 & $US331 per tonne to produce 100% nitric acid equivalent at the Oxley site."
Is this a gobblegook way of saying the cost of production of Potassium nitrate is $US148 to $US331?