The Mackay Mansion was once the residence of John Mackay and also served as the office for the Gould and Curry Mining Company. Mackay, an Irish-born immigrant, was the richest man the Comstock ever produced. Built in the 1860s, the building survived the Great Fire of 1875 and became the headquarters for Mackay, Flair, Flood and O’Brien, the Silver Kings of the Comstock.