| Bornhorst, T.J., Barron, R.J. (2011) Copper deposits of the western Upper Peninsula of Michigan. The Geological Society of America Field Guide 24: 83-99. 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. |
Cliff Mine, Allouez Township, Keweenaw County, Michigan, USA