The richest discovery in the history of mining occurred in 1873. This so-called \"Big Bonanza\" made. _______ the richest man in the world.. A) Henry Sutter. B) Henry Comstock. C) John Placer. D) John Mackay
There were four men who discovered the Big Bonanza in 1873. Among these four men, John Mackay became the richest.
The answer is D) John Mackay.