Ann: Chairmans Letter to Shareholders , page-11

The 18months was when sections of LP4 will be due for restacking.

The restacking should be almost continuous with the other 2 LPs being the next to be restacked with the new higher grade.

If you want to know grades go back and have a look at the ore reserve, I believe they said they mention the level they are down to in this report. Also the lower grade material they have stacked is the old material that was there from the macmin operations, I believe it was ~60g/T off the top of my head