RE:RE:Questions about their grade control system BS , do you understand that blasthole stoping does not possess the selectivity that cut and fill, or even shrinkage provides. ?? Sure, if low grade is detected at a stope boundary,, or HW or FW, it can remain unblasted but as soon as you want to leave a single ring in place , you need a new slot raise and all the extra drilling required open up the slot.
They probably possess only one VR30 , the machine used to drill the slot raise and youd compromise the schedule if you pulled it away from its scheduled tasks. Not to mention that if you did this , you might also severely compromise the ability to mine the stopes directly above in a timely manner.
Each stope is designed to be 30 metres high 15 metres long and about the same width. There is minimal selectivity once the planning is completed and drilling commences.