How about AMN using a specific rate royalty of 73 cents versus...

How about AMN using a specific rate royalty of 73 cents versus RWD using an Ad Valorem rate of 2.5%.
RWD reckons using the specific rate would A$77M to their NPV.
Let us except that there are some differences such as AMN using US$ but at the end of the day you must be disappointed with the PFS on the back of the media train over the last 4 years?
My only claim to any expertise is knowing some year 12 chemistry and knowing what impact a lower solute concentration is likely to have when you evaporate a solution.