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From Spanish bonanza (calm sea, fair weather, good luck, rich lode), from Medieval Latin bonacia (fair weather), a blend of bonus (good) and malacia (calm sea).



bonanza (plural bonanzas)

  1. In mining, a rich mine or vein of silver or gold.
  2. The point at which two mother lodes intersect
  3. By extension, anything which is a mine of wealth or yields a large income or return.
    • 2013 August 31, Bagehot, “The parable of the Clyde”, The Economist, volume 408, number 8851: 
      For two decades the bonanza on Scotland’s west coast continued. An occupation that had been seasonal and modestly profitable became year-round and lucrative. Baskets of herring put televisions into fishermen’s cottages and cars outside their doors. But fish, like oil and gas, with which Scotland’s continental shelf is also well-endowed, are not in unlimited supply.
    The popular show quickly became a ratings bonanza for the network.