The under call is probably due to how the RC samples the clay...

The under call is probably due to how the RC samples the clay but the lack of reproducibility can easily be accounted for by a non-total assay scheme.

The high grade is concentrated in most dd samples to a 1m and occasionally 2m interval so we really don’t know if the gold is even more concerntrated to an even higher grade in a thinner lamination in the clay. If so you could end up with an analogous example to the assay problem if the clay is moist and not easy to riffle split. The small portion of the sample that carries most of the gold could end up being missed in the sampling process after the cyclone on the drill rig. I doubt the samples being sampled would have hand the consistency of mud. They might be moist but you’d expect a reasonably dry sample at that depth. If the samples are very clayey they can cause trouble for sampling.Esh