bonanza

1. (mining) A rich mine or vein of silver or gold.Antonyms: borrasca

2. (by extension, figurative) Anything which is a great source of wealth or yields a large income or return.Examples: "The popular show quickly became a ratings bonanza for the network."; "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."; "It has also yielded a bonanza for corporate executives and other shareholders: Money not spent filling warehouses with unneeded auto parts is, at least in part, money that can be given to shareholders in the form of dividends."Synonyms: mother lodebroadlyfiguratively