FYI.
the ATO has granted Norwestshareholders who took up the Minres takeover offer, Roll over relief for fy2023.
So my interpretation is that no capital gains applicable to your original Norwest shares until you sell the resulting Minres shares.
So if held the Norwest/Minres for more than 12 months as an investment, you get the 50% capital gainsbenefit i.e. only pay tax on 50% of the capital gain you made.
Check with your financial adviser/tax accountant to be sure.