RE: 600X800 - stockntalk"and on top of this, this is only down to 350m...how much more is down there that will be economical to mine"
I'm thinking of the 3 feeder vents reported from the 147 megacomplex. Note that the very rich NWT pipes (Ekati, Diavik) are feeder zones only, not the 'low-grade' mushroom cap we see at FALC. Perhaps FALC feeder zones will be just as rich as their NWT counterparts, but first there will be all that 800 million tons of 'low grade' to get through first!
The following diagram emphasizes the size contrast (and potential ore tonnage) between a Fort a la Corne Kimberlite and a "pipe only" (Northwest Territories or South Africa) style Kimberlite.