gold rush

Noun

• a large migration of people to a newly discovered gold field

• a sudden happening that brings good fortune (as a sudden opportunity to make money)
  • the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line
    

Related words

• Synonyms: 
  boom , bonanza , gravy , godsend , manna from heaven , windfall , bunce