goldmine

Meanings

1. 1
   noun

   a mine from which gold ore is extracted

   The abandoned goldmine still contained rusting rails and ore carts.

2. 2
   noun

   figurative: a rich and valuable source of information, opportunity, or profit

   The newly digitized archive is a goldmine for historians of the city.

A closed compound of gold + mine. The figurative sense extends the idea of a productive mineral deposit to any unusually rich source of value.

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