Petersen, Max S.2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/5853Date scanned: 2002-5-21.USBM #59652; Close up of signal-light switch (cover open) operated from bridle bar of track switch. Maas Mine, Cleveland-Cliffs Iron Company, Negaunee, Marquette County, Michigan. (March 1945 - M.S.P.).Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.The Maas Mine is located in the Marquette Range near Negaunee, Michigan. The Mine was discovered by George Maas and leased to the Cleveland-Cliffs Iron Company in 1901. Cleveland-Cliffs Iron Company was formed with the merger of two major iron mining companies on Michigan's Marquette Range in 1891. The Company had a number of mines operating in the Upper Peninsula by the outbreak of World War I. By the 1940s the high grade iron ores mined underground were becoming depleted. The Company developed a process to concentrate low grade ores into iron ore pellets in the 1950s, and C.C.I.C.'s last underground iron mine closed in 1979.Rights management statement available at: http://library.mines.edu/digital/rights.htmlCleveland-Cliffs Iron CompanyIron mines and miningMiningScenes, undergroundUnderground miningStillImage