rcr report out, page-86

for tonnage you would still need to seperate how much rock on surface is ore mined from stopes and how much is country rock and low grade ore from development.
I would guess (from being at other ROM pads)there are at least 2 different stockpiles may be hard to differentiate both from a distance to determine which is which bojangler.
SO I would think your spying may be a waste of time but good luck, probably better to just call NG for affirmation