| 1. | a mine yielding gold. |
| 2. | a source of great wealth or profit, or any desirable thing. |
| 3. | a copious source or reserve of something required: a gold mine of information about antiques. |
| gold mine n. Informal A rich or plentiful source of something desired. |
gold mine
A rich, plentiful source of wealth or some other desirable thing, as in That business proved to be a gold mine, or She's a gold mine of information about the industry. [First half of 1800s]