Well, I don't know much about the mountains in Australia, but I've heard of Lightning Ridge opals, so I guess I've always assumed they come from a mountain called Lightning Ridge. I know the particular opal is mined in Australia...but I really don't know the particulars any more than that.
Thanks for letting me know about the adoption bit. I'm always curious about different practices, but I bet that's pretty similar to how it is in the States too. I sure hope they say yes next time. I understand how it is having to ask the government for permission to travel. It's no fun.
The adoption will be finalised in Jan/Feb next year we hope and then he can come with us everywhere, I do have another trip in October that I have to go by myself which I am not looking forward too, but I am committed so have no real choice.