I think that the point to focus on is that mineralisation comes all the way through to surface. The 'gossan' while focused on a number of properties (including sulphides which are important with copper) is on some level saying, "we have this evidence of ore, weathered , and at surface.".
All of which means it is there, we have 'at surface evidence' and there is no expensive removal of waste involved to dig it up.
PS 'We think it is the tip of an orebody, more sits directly below'