Banking act 1959 sec 42, page-2

With the way Govt's are these days, I would be more worried the other way round. This might be a good thing. It's the Govt who would want to steal your gold to help them pay for their debts and deficits. The RBA would only want gold to back the currency (which is unlikely) and, as you no doubt know, they can print up what they need to buy the gold. Anyway....