Ann: Quarterly Activities and Cashflow Report, page-65

Common sense says that Aussie goldies with mines in Aus are more sensitive to Aud gold spot price.

In general the company earning is dependent on gold spot price in its domicile currency. For example RSG being based in Aus, implies that its earning from the African mine will need to be converted to A$ and this is a function of the exchange rate: just as gold spot price is determined by the exchange rate. So its mine location will not have any effect on its earning but the company domicile and the domicile gold spot price in general does.

However I don't think there is any study to confirm on the above assumptions.

Above is just my opinion.