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Hard iron ore at the Cliffs Shaft Mines, Ishpeming, Michigan
Jacob Eugene Gair
1974, Open-File Report 74-227
At the Cliffs Shaft Mines, for many years the premiere hard iron ore mine of Michigan, bodies of ore typically are localized in the upper part of the Negaunee iron-formation, close beneath Goodrich Quartzite in the axial part of the Marquette synclinorium. Individual ore bodies may be as much as...