What's worrying me is this. There were 4 holes for a total...

What's worrying me is this. There were 4 holes for a total distance of 1100m, so say about 300m each in depth. Part of the announcement says:

"The four drillholes in the oxidised cap indicated continuous gold mineralisation from near surface
to +40m downhole in the upper gold domain dominated by iron-oxides after primary sulphides,
and then +45m of oxide copper mineralisation in the underlying copper domain that is almost
entirely composed of secondary chalcocite, and lesser chalcopyrite."

This suggests that the total depth of mineralisation is about 85 to 90m. If the drilling has gone down to 300m without reporting additional mineralization, doesn't it mean that the deposit is not much bigger than what has been already discovered by historical drilling? What am I missing?