A while back we were befriended by a drilling team working on the Tanami.
They were after rare earths and were not interested in gold.
They showed us the cores that were laid out in order representing a kilometer of drilling.
Thin bands of gold could be seen from several depths.
The drillers then went down another metre and showed us the core. It broke apart at a thin layer of gold that covered the whole face.
How extensive the gold deposits are and whether or not they could be mined at a profit was not apparent, but there are certainly deep deposits of gold under the Tanami and deep drilling seems to be a routine practise.