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(...continued) In 1873, an adit known as the Glendon Tunnel, was driven northeast from the Lower Wood lot with the eventual purpose of connecting to all of the mine properties and hauling their ore. Tracks were laid inside the tunnel in 1876 and three years later, George Richards and others incorporated it under the corporate title, the Hibernia Underground Railroad. At its greatest length, the railroad ran approximately a mile and a half underground where it terminated at the Willis Mine. Steam locomotives exited from the mouth of the tunnel carrying strings of loaded ore cars over an elevated trestle 1,800 feet in length to ore docks. From there, the ore would then be transferred to the larger Hibernia Mine Railroad.
Between 1854 and 1885, approximately 1.8 million tons of ore were produced in all. The Andover Iron Company (formerly known as the Cooper, Hewitt & Company) acquired the Lower Wood Mine in 1891, operating under the name Andover Mine (not to be confused with Cooper and Hewitt's other Andover Mine).
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