Yes, a key point. We know when HAW has had to blow their...

Yes, a key point.

We know when HAW has had to blow their trumpet, they've always kept it as muffled as possible.

The significance of the potential new resource at shallower depths is that, as stated, it appears accessible through (lower cost) lateral mining.

Once done. the section implies it would then make extraction of the deeper reserves also more economical, by making a vertical shaft unnecessary.

Does this imply a significant shift in project viability, or even higher profit than anticipated?

We don't know for sure. As always, HAW's inscrutable achievers are keeping schtum.