Michigan Iron Mines |
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AMASA Archean banded iron formation blast furnace body charcoal City of Wakefield concentration plants CROSS SECTION Crystal Falls deposits dikes dolomite EAST MENOMINEE IRON FALLS IRON RANGE fault Figure 12 footwall side FOOTWALL SLATE GEOLOGIC COLUMN GOGEBIC IRON RANGE Gogebic range grade iron granite greenstone Gwinn Iron District HANGING WALL IRON hematite horizontal Huronian intervals iron bearing iron minerals iron particles IRON RANGE FIGURE Iron River IRON RIVER-CRYSTAL FALLS Keweenawan LAKE MICHIGAMME Lake Superior LEGEND low grade main haulage level main level MARQUETTE COUNTY MARQUETTE IRON RANGE Marquette range MENOMINEE IRON RANGE Michigan iron mills mining drifts Negaunee oldest rocks open pit ore-raise OUTCROP OF IRON pig iron PILLAR produced quartz slates QUARTZITE raises RANDVILLE RIVER-CRYSTAL FALLS IRON River-Crystal Falls range rock unit scraping drift scraping sub sedimentary rocks shaft shown on Figure silica slot stope strata sublevel surface thick tightly folded transfer drifts trend vertical vicinity WALL IRON FORMATION