 An underground railroad has been constructed from the foot of the hill northeast upon or in the vein through the bowels of the mountain, which brings the product of all the upper mines to the terminus of the Hibernia Mine Railroad, on which all the ore of the Hibernia mines goes to market.The tonnage of this road, almost entirely made up of the product of these mines, was 99,123 tons in 1879.History of Morris County, New Jersey with Illustrations, and Biographical Sketches of Prominent Citizens and Pioneers, 1739-1882; New York