Totally predictable. Usually these scams have an address that is a UPS Store P.O. box, but in Australia, maybe their equivalent is the local laundromat.
Not only do they not know where their "mine" is located, but I wonder if their tour was "virtual". From the timing of their PR at 3 in the morning, it appeared to be on Australian time.
All of that has been 'changed'. If you go to Sunbiz.org (Florida SOS) and search for Gold Mining USA Inc. and you will see they moved it to iirc Sacramento, not 100% sure atm cause I'm not looking at it atm.