Mining parametersThe minimum drift width is 4.5 metres. If the vein is only 2.5 metres wide a metre of waste rock has to be mined on either side of the vein. That is almost 50% diluton. If the vein is running 0.5 oz/t the dilution doesn't matter too much.
Most of NFG's veins are clustered together into "damage zones". The entire damage zone is going to be mined out. Last I heard the width of the iceberg damage zone was 17 m.
High grade gold is never homogenous. If you get several big hits out of 30 there is a high grade all over the place. It's important to look at the big picture.