Anglogold Trades under the symbol AGG on the ASX, but it does not have options there (it does trade options in the US under the symbol you mentioned, AU).
As to the liquidity, there are only about 20 names that trade at least Australian$ 20,000 or more of options, on average, each day.
I attached an excel spreadsheet that has the 79 optionable stocks and their DVO (which stands for the Dollar Volume of Options traded - on average over the past five trading days).
You can ignore the last four columns which just show the current volatility levels (implied -IV and statistical-SV, plus their current percentiles relative to their past history).