Hi all. Information on daily gross short sales is available on ASX website below:
Unfortunately, there was 117 947 or 0.55 % gross short sales on 20-Apr-2017
TMT TECHNOLOGY METALS AUSTRALIA LIMIT FPO 117,947 21,300,001 0.55
http://www.asx.com.au/data/shortsell.txt
I hope that helps. And good luck to all holders.