i'm may not know much about this.. but i saw the diamater of the core samples they drilled.. and i've listened to the statements of 1 - 4 carots per ton or some crazy crap like that... it dosent look to me like any of those core samples reach into the tons range... so why would u expect sizable diamonds? if it were that easy.. i think they would be cheaper.
just a dumbasses (is iq over 150 dumbass?) guess, lol... but it seems a smart one...