BHP in those drays would only have bothered with very obvious large outcrops, of the type found over the historic Goldsworthy mine. If they had drilled around this target there would be records for sure.
Difference now is geophysics. Gravity and mag surveys last year modelled this target to around 30m below surface and around four times the size of Goldsworthy. A more recent high def mag survey was used to vector the current drill programe. So if there is a discovery now, it will be open open pittable and have scale.
I recall the programme is 8,000m, so more like 40 holes, and then moving onto the northern target, which is a similar size
