O iş bir altın madeniydi.
- That business was a gold mine.
O bir altın madeninin üzerinde oturuyor.
- She's sitting on a gold mine.
This oil deposit is a regular gold mine. We make more and more money every year!.
The Smithsonian Institute is a goldmine of knowledge, but like most mines, you have to dig for the good stuff.
South Africa has many goldmines.