• Safety gate Cliffs Shaft Mine 

        Author(s):Petersen, Max S.; Arthur Lakes Library; Russell L. and Lyn Wood Mining History Archive; United States. Bureau of Mines
        The Cliffs Shaft Mine in Ishpeming in the Marquette Range was the largest producer of hard specular hematite in the US. The Cliffs Shaft Mine (New Barnum Mine) was opened by the Iron Cliffs Company in 1881 and operated by ...