He should be a gold mine of information for them.
I might, she told herself, be looking at a gold mine.
He'd found a gold mine and didn't want anyone to know about it.
There's a gold mine further down, which you can just make out from here.
The deal with the Met could make a gold mine of this site.
This was like no gold mine he had ever heard of.
Sure, that guy knows a lost gold mine he's going to offer us.
This is a little gold mine we've got going here.
For students of popular culture the material is a gold mine.
For all this, however, the place is not yet a gold mine.
