The richest discovery in the history of mining occurred in 1873. This so-called "Big Bonanza" made _______ the richest man in the world.
http://www.google.com/#q=%22Big+Bonanza%22++richest+man+in+the+world.
To find out who became the richest man in the world due to the "Big Bonanza" discovery in 1873, you can search for information using a search engine like Google. Enter the terms "Big Bonanza mining discovery 1873" or "richest man in the world 1873" in the search bar. One of the top results should provide you with the answer.
Based on historical records, the richest man in the world as a result of the "Big Bonanza" discovery in 1873 was John Mackay. He became a billionaire and held vast wealth due to the silver mining discovery known as the "Big Bonanza" in the Comstock Lode in Nevada, USA.