Ann: Excellent Results from Andover Metallurgical Testwork, page-14

probably because the announcement was disingenuous , it was the recovery to a concentrate , not the final recovery so really a mass pull announcement, but did not show the mass pull.
ie if they get a 94% recovery of Cu to concentrate and then get a 80 % recovery later at smeltering of the concentrate then the actual recovery is 94% * 0.8 = 75% recovered .
Also the recoveries were not shown optimised for the most payable mineral which tends to lower the recovery of the other mineral instead they were optimised for both minerals which is not real world .
I hope ASX goes over this with a please explain