What does the word bonanza mean?

Usage examples for bonanza

  1. It'll be the other way about: I'll dig gold for any man on Bonanza that'll pay me wages. – The Magnetic North by Elizabeth Robins (C. E. Raimond)
  2. And in spite of the fact that Fairchild now felt his mine to be a bonanza, unless some sort of a miracle could happen before that time, the mine was the same as lost. – The Cross-Cut by Courtney Ryley Cooper