Poor guy's trying to measure such massive grades he's struggling to keep all his gear calibrated.
Keep in mind that the highest grades we've seen are likely to be closest to the mark as I explained previously. With so many variables (flux, temp., smelt time, viscosity, etc.), most extractions to date will have had very poor recoveries. The new assay technique will give us a measure of the true tenor of these monster intrusives. That last update is revealing.
If a simple polygonal estimate from the six holes at Tres Estados gives us 9.5Moz, what are we going to get with a massive increase in the average grade? Then there's the Ema holes with holes that are 2-3 times as deep.
That archaeological report should be sitting on somebody's desk as well, waiting for sign-off: "BBX expects to present a final report to IPHAN by late-December 2018."