A miner at heart, Hagerman was not about to be left out of the silver boom hitting the region. H.B. Gillespie, a mine owner in the region who had been involved in several major silver strikes, owned the Mollie Gibson mine, near Aspen. A major silver vein had been discovered in the mine, but Gillespie was convinced that the vein also ran under a number of other, nearby mines. Seeking capital to purchase these properties before news of the strike got out, Gillespie contacted Hagerman, who agreed to invest heavily in the new company. In 1890, the Mollie Gibson Mining & Milling Company was organized with Gillespie as manager and Hagerman as president. The company quickly purchased the Lone Pine, Silver King and Sargent mines and invested heavily in the Emma and other smaller mines. The company announced its silver strike on December 9, 1890. The combined Mollie Gibson mine became the richest silver mine in the world until that time.
