Ann: Callisto Exploration Update, Diamond Drilling Begins, page-102

Because we couldn’t drill deep enough to intersect mineralisation @ NRC 279/80/92/93, company RC drilled to a depth above it and set a steel pipe in those holes post drilling to provide hole stability and ease of re-entry when they come back with diamond rig. It’s much cheaper/faster/more efficient than diamond drilling the lot and it’s a common practice when drilling through overburdened.

If you actually plot the coordinates of the holes that have been pre-collared you’ll notice a nice NE-SW trend where they’ll drill deeper and hopefully hit some of that heavy dissemination. I’m not sure about massive Dini since the deposit is alike Platreef, but that would be unreal if it happens somewhere along the strike up north, or south at Jimberlana/MS. Good luck