siegfried,

Have no experience with resource calculations but suspect that the issue surrounding the major drop in tonnage relates directly to the hole that missed the Chromate . The computer program or programer would possibly allow for some distance around the blank zone, possibly as much as 50 m. This would immediately take out a big chunk of the strike length. Additional drilling around this zone may identify how large the gap is and the resource calculation re-run with these limits. Will Dave re-drill and get real data so the programer know the limits of this blank area, who knows.

Just my thoughts

MH