Hard iron ore at the Cliffs Shaft Mines, Ishpeming, Michigan
Open-File Report
74-227
By: Jacob Eugene Gair
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- Document: Report (pdf)
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Abstract
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 100 feet thick and extend laterally for many hundreds of feet. The cluster of ore bodies making up the Cliffs Shaft deposit has an overall length of about 4,500 feet from east to west parallel to the axis of the syncliorium and a width of 1,500 feet from north to south. The deposit extends beneath much of the City of Ishpeming, from a short distance west of the city limits to almost the east edge of the city.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Hard iron ore at the Cliffs Shaft Mines, Ishpeming, Michigan |
| Series title | Open-File Report |
| Series number | 74-227 |
| DOI | 10.3133/ofr74227 |
| Year Published | 1974 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 6 p. |
| Country | United States |
| State | Michigan |
| City | Ishpeming |
| Other Geospatial | Cliffs Shaft Mines |
| Google Analytic Metrics | Metrics page |