are we about to find the source/megapit

"The holes showed deep oxidation and weathering to some 50m as well as abundant sulphides in the last hole"

Now I have done some quick reading and it sounds like sulphides are not associated with Slate Dam style deposits, it seems possible that we could be on the cusp of locating the source material or a source.  This is potentially massive news.

I found this which is a good read on the slate damn style deposit or at least similar deposits in area

Archaean gold deposits

Archaean gold deposits account for more than 60% of the world's gold. Over 60% of this comes from the Witwatersrand of South Africa (a hydrothermally remobilised palaeo-placer gold deposit) and the remainder from Archaean lode gold deposits in Australia, Canada, southern Africa and South America. The Archaean granite-greenstone belts of the world are characterised by numerous lode gold deposits, the largest of which is the Superior Province of Canada which has produced more than 170 million ounces of gold (a troy ounce is 31.1 grams).
In Australia, most Archaean lode gold deposits occur in the Norseman-Wiluna greenstone belt of Western Australia (this includes the famous Kalgoorlie Golden Mile containing the Super Pit, an open-cut gold operation that has dimensions of 3 km x 1 km x 1 km). These gold deposits are generally of large tonnage (millions of tonnes), and low-grade (commonly 1.5 - 3 g/T), confined to very narrow, mostly steeply-plunging near-vertical structures and are sulfide-deficient. They are confined to the volcanic-intrusive-sedimentary sequences of the greenstone belts and not the granites.
There is a very strong structural control to Archaean lode gold deposits with most being related to regional fault systems. The gold mineralisation usually occurs at the contact between the veins and wallrocks. Most of the ore in these deposits is of the disseminated type with the gold mineralisation generally being invisible to the naked eye. The formation of these deposits is linked to regional-scale processes at mid-crustal levels during regional metamorphism.
copied from "https://australianmuseum.net.au/geological-ore-deposits"