Ann: Notice of Annual General Meeting/Proxy Form-RWD.AX, page-28

the grade is what counts. the super high grade surface brine means their pumping requirements will be far less for the first 15 years than for the rest of the life of mine. that said I think it is important that the company defines the total available reserve. another point of view though is why spend money (on proving up 25+ years of available brine) when you don't have to. just focus on what takes you to cash flow as fast as possible. the rest will take care of itself down the track i.e production expansion and extension of life of mine.