A CGT event happened on 7 December 2011 when UXC paid a return of capital on your UXC shares.
The return of capital is a non-assessable payment. If you continued to own your UXC shares after 7 December 2011, you must adjust the cost base (and reduced cost base) of your shares as a result of receiving the non-assessable payment.
You received $0.02 for each UXC share that you held at 7pm on 2 December 2011. This amount is your capital proceeds.
Cost base (and reduced cost base) of shares
The cost base (and reduced cost base) of each of your UXC shares is the price you paid for them (plus any incidental costs such as brokerage).