RE:What I get from all this..........I think next two quarters will be ok on the basis that half of production is 1320 and above, and both 1200 and 1320 have stopes extending up three levels from each so it is not as isolated as it once was.
At either end of the stope they could leave low grade behind unblasted. In the centre of a stope, they could identify a low grade interval, blast it in one separate blast, and remove it to the waste pile instead of an ore pile. The grade control system should be working much sooner than that?, they may just be giving a very long buffer period to be safe.
The long section is not so good to see the grades, above 1200 it splits into two lenses, so they may have had to show an average. If a person went through all the documents available, there may be some more sections that help show the grade better?