Wow, is that your chunk of Homestake core? Surely not......!
That is not typical for Homestake ore, which was more in the range of quarter oz/ton, at best. Some of the Tertiary veining cross-cutting the Precambrian cummingtonite schist could be anomalously high grade but was pretty hit and miss.
Until I see something from one of their emminent geos saying they actually drilled, I am skeptical.