Ropes Gold Mine, Ishpeming Greenstone belt (Marquette Greenstone belt), Marquette Co., Michigan, USA
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List of minerals for each chemical element
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Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1086.
Economic Geology (1945), Geology of the Ropes Gold Mine, Marquette County, Michigan (March 1945): 40(2): 115-128.
Rocks & Minerals (1983): 58: 112.
Fountain, D.R. (1992), "Michigan Gold: Mining in the Upper Peninsula," Lake Superior Port Cities Inc., Duluth, MN.