Might have been a cheap punt by a player who already holds but had sold down in case that report came early and was extra good. He can now buy at his leisure for a while it seems.
You could have tried to sell 20m mill shares at 8.9 (worst case loss 1.1c + .001) the other day as a play and your worst case would be take up the options but as it turns out the short is in profit and would have been bought back. Bet he is pissed that he didn't get set for the full short it would hsave been a big play and not often you get a chance to insure your worst case loss on guarantee of oppies exercise. I know there was an enquiry on borrowing GTM so maybe that was why.
GTM
greentech minerals ltd - tba
options being converted, page-2
Currently unlisted. Proposed listing date: TBA