The hole I calculated is in the new area (not in fill). My comment relates to the situation say for example where in the 43-101 calculation the models suggest say 100 M at 3% and when you infill you actually find 75 M at 2%.... that is what costs you volume my friend. Don't mix apples and oranges. In fill drilling only increases volumes if the grade/widths are increased over the assumed model values.

BB