When you look at the Not sections you will note that the massive sulphide ( the chamber) is surrounded by disseminated sulphides (The conduit) not has done a very good job of defining the massive sulphides both laterally and at depth, (several hole scissor the deposit at depth with limited results) As for study after study, I think they have hit this deposit with every concevable geophysical instrument conceived by mankind. Their downhole pulse didn't indicate a wopper down there that they missed. But I guess I must concede to the possibility of picking up a massive sulphide type anomaly close to the MOHO