pay dirt vs success

pay dirt

noun
  • A profitable area or period; success. 

  • Earth which contains profitable quantities of ore. 

success

noun
  • Financial profitability. 

  • The achievement of one's aim or goal. 

  • One who, or that which, achieves assumed goals. 

  • The fact of getting or achieving wealth, respect, or fame. 

How often have the words pay dirt and success occurred in a corpus of books? (source: Google Ngram Viewer )