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English definition of “gold mine”

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gold mine

noun [C] /ˈɡoʊld ˌmɑɪn/

gold mine noun [C] (PLACE)

a place where gold is removed from the ground

gold mine noun [C] (OPPORTUNITY)

an opportunity for making a lot of money: In the eyes of real estate developers, this property was truly a gold mine.
(Definition of gold mine from the Cambridge Academic Content Dictionary © Cambridge University Press)
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