| Rosemeyer, T. (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District. Rocks & Minerals: 84(4): 298-323. Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp. |
Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA