Pronunciation: /ɡoʊld maɪn/
noun A source of great wealth or profit
A1 The gold mine produced a lot of shiny metal.
A2 The old abandoned gold mine was rumored to be haunted.
B1 Investing in stocks can be a gold mine if you pick the right companies.
B2 The entrepreneur discovered a gold mine of opportunity in the emerging market.
C1 The research project turned out to be a gold mine of valuable data for the company.
C2 The historical archives were a gold mine for the historian researching the ancient civilization.
formal The company invested in a gold mine in the hopes of striking it rich.
informal That old abandoned house turned out to be a gold mine for vintage furniture.
slang Her Instagram account is a total gold mine for makeup tips.
figurative His extensive collection of rare books is a gold mine of knowledge.
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a gold mine