I would expect that the plant has been shut down for...

I would expect that the plant has been shut down for modifications,and recovery results will only be given out every quarter unless a huge diamond is found.
Going by the amount of 5 carat diamonds that have already been recovered from the BK6 sample it would not make sense to announce each time a diamond arround 5 carats is found as this may be happening every week while the plant is runing.
It is obvious that the market does not care about great grades or big diamonds,all that maters is a plant that can process at a greater rate so that a resource can be achieved.