goldmines

/G OW1 L D M AY0 N Z/
noun
  1. 1

    A mine for gold ore or metal.

    โ€œSouth Africa has many goldmines.โ€

  2. 2

    A very profitable economic venture.

    โ€œThis oil deposit is a regular gold mine. We make more and more money every year!โ€

  3. 3

    A plentiful stockpile of something sought after.

    โ€œThe Smithsonian Institute is a goldmine of knowledge, but like most mines, you have to dig for the good stuff.โ€

Source: https://en.wiktionary.org/wiki/gold%20mine, https://en.wiktionary.org/wiki/goldmine, https://en.wiktionary.org/wiki/goldmines