bonanza

noun

(mining) A rich mine or vein of silver or gold. / The point at which two mother lodes intersect.

The miners discovered a bonanza of gold in the mountains.

意味（1）

(mining) A rich mine or vein of silver or gold.

意味（2）

The point at which two mother lodes intersect.

意味（3）

(by extension, figuratively) Anything which is a great source of wealth or yields a large income or return.

The popular show quickly became a ratings bonanza for the network.