I don't know how many rounds of additional minted tokens but there are.
According to following post made by GOLD_official, they have plan to store over 60 kg of physical gold in the bullionstar vault.
Since the beginning of 2020, the amount of physical gold stored in our vault storage doubled to the total value of almost $1 million. We are planning to triple the assets withi 2020 and reach over 60 kilos of gold bullions in the storage.