Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeBedded, Chemical Sediment
Model241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Deposit sizeM
WorkingsUnderground
Orebody formSTRATABOUND
Materials
Ore mineralsHematite, Magnetite, Goethite
GangueQuartz
Geology
Host rockIron Formation · Negaunee Iron-Formation
StructureWestward plunging synclinorium open at western end; regional trends are eas
AlterationSome magnetite formed by replacement of ferrous iron minerals during diagenesis and most iron silicate probably formed by metamorphism of an early silicate mineral.
Economic & production
Development statusPast Producer
Production yearsSHIPMENTS WERE MADE FOR SOME MINES IN THE GROUP EVERY YEAR FROM 1858 TO 1945 EXCEPT FOR 1932, 1938, AND 1944.
First production1858
Last production1945
Discovery year1844
Identification
Deposit ID10082749
MRDS IDW062099
Alternate namesHard Ore, Hematite, Holmes, Section 16, Section 21, Section 10 Exploration, Holmes-Section 16
RegionNA
Data scoreB
Coordinates46.4825, -87.67585
References
LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES, 2D ED.: CLEVELAND, OHIO, LAKE SUPERIOR IRON ORE ASSOCIATION, 334 P.MOST ALL OF THIS DISTRICT HAS BEEN MAPPED AT 7 1/2 MINUTE QUADRANGLE SIZE. TOO MANY GEOLOGISTS HAVE BEEN INVOLVED TO MENTION INDIVIDUALLY. GAIR, J.E., 1975, BEDROCK GEOLOGY AND ORE DEPOSITS OF THE PALMER QUADRANGLE, MARQUETTE COUNTY, MICHIGAN: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 769, 159 P.LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES: CLEVELAND, OHIO, 2D ED., 75-92 P.