The Bonanza Kings, also called the Silver Kings, was a nickname given to the four men who started a stock brokerage called Flood and O'Brien, more commonly known as the Bonanza Firm. Bonanza is a Spanish term meaning "rich ore body"; in 1873, after gaining control of the Consolidated Virginia Mining Company, they discovered a large vertical ore body more than 1,200 feet deep which became known as the "big bonanza".[1]