gold mine vs worth

gold mine

noun
  • A plentiful stockpile of something sought after. 

  • A mine for gold ore or metal. 

  • A very profitable economic venture. 

worth

noun
  • Wealth, fortune, riches, property, possessions. 

  • Value. 

  • Merit, excellence. 

  • An amount that could be achieved or produced in a specified time. 

adj
  • Deserving of. 

  • Having a value of; proper to be exchanged for. 

  • Making a fair equivalent of, repaying or compensating. 

How often have the words gold mine and worth occurred in a corpus of books? (source: Google Ngram Viewer )