Just because it is delisted doesnt mean you can book the loss, as HDY will just become an unlisted entity.
You will need to transfer the shares elsewhere to book the loss... i believe delisted.com.au offers a service for this. Not advice but something to look into and discuss with your accountant.
Commiserations to all holders we all get these ones of the spec end but it hurts more when it comes to management failures and not the products/tenements failing.