This is my thoughts on the delay of news . They may be trying to expand the DIA and we all know in the past this hasn't been an easy task . If they were to announce bonanza grades before they had the DIA in hand the locals could even shake them down for more ticcky . So , get the DIA first then release great assys .
These are only my thoughts or should I say wishful thinking but , it could be the case .
Yes , this is legal for the exchange because it is no different than tight hole status that oil companies use .