Ann: Stockpile Tests Produce Recoveries and Grades up to 22% Cu, page-27

This was really fascinating reading. I went to Wikipedia to try and understand a bit better what was going on...
https://en.m.wikipedia.org/wiki/Supergene_(geology)

And from what you've said above and what I understand the original drilling campaign was looking for new supergene or to expand the supergene lenses known. This was only moderately successful. The supergene at Cangai is the enriched leached oxides and has been well mined.

Sitting under that should be the supergene/hypogene boundary where high concentration sulphides have been formed through groundwater percolation and redistribution of ionic Cu.

Phase II drilling is looking for these but since it follows those sulphides must be there, importantly they are looking for concentration, depth, intercept and general volume of those massive sulphides.

So to say they are drilling the supergene is whimsical, really they are using the supergene zones to target the massive sulphides underneath.