In 1871, John William Mackay, James Graham Fair, James Clair Flood and William S. O'Brien, organized the Consolidated Virginia Silver Mine near Virginia City, Nevada, from a number of smaller claims on the Comstock Lode and later added the near-by California mine.
William S. O'Brien (1825 – May 2, 1878) was an American businessman who formed a business partnership with fellow Irishmen James Graham Fair, James C. Flood, and John William Mackay, the Consolidated Virginia Mining Company.
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