Note that GOLD is not exactly 1/10th of an ounce as they deduct the 0.4%management fee by selling gold underlying the shares. If you look at their website it says that the entitlement is currently 0.0980231 ounces per share. This makes using its chart a bit misleading as you have to apply a different "factor" for each month (as the entitlement reduces each month) to make each price equivalent.
That is why when the Perth Mint (shameless plug following) created its ASX product (ZAUWBA) we decided the best way to collect our 0.15% management fee was to deduct shares from holders and keep the entitlement to gold constant.