Not so sure about - NST are having to go really deep at existing...

Not so sure about - NST are having to go really deep at existing and deep = greater risk:

http://www.abc.net.au/news/2018-03-...-deeper-looking-for-major-discoveries/9495184

Breaking the 3km barrier to test signs of Zodiac

Contractor DDH1 Drilling is working on the hole at the Jundee operations near Wiluna, 950 kilometres north-east of Perth, as Northern Star looks to firm up a significant new gold discovery called Zodiac.

The planned depth of the Jundee hole is 3,100 metres, which would better the previous Australian record of 3011.5 metres at Kalgoorlie-Boulder's world-famous Super Pit gold mine in 2015.

Deeper exploration is symptomatic of a bigger problem in the Australian gold sector, which has picked most of the low-hanging fruit in terms of major gold discoveries starting on the surface.
Mr Pollock said deposits were becoming harder and more expensive to find.


This is the point I was making around the CTP - nice and shallow - low hanging fruit..and whose to say there isn't even better deposits lower and around it - NST sure seem to interested in snapping up ground where they can..