I showed the following ASX release to my accountant back in 2015. She said based on that you could claim the loss. Seek you own advice though... https://hotcopper.com.au/threads/ann-tax-declaration-to-shareholders.2543609/
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
AN1 CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch