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Topic: INDUSTRY

goldmine

 noun
     
gold‧mine , gold mine [countable]
1 informal a business or activity that produces large profits:
The nightclub turned out to be a goldmine.
2TI a place where gold is dug out from a hole in the ground
3

be sitting on a goldmine

to own something very valuable, especially without realizing it
Definition of goldmine from the Longman Dictionary of Contemporary English within
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