Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeBedded, Chemical Sediment
Model241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Deposit sizeS
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 statusProspect
Production years1865-1887, AND 1915-1916
First production1865
Last production1916
Discovery year1844
Identification
Deposit ID10082748
MRDS IDW062098
Alternate namesIron Mountain, Iron Mountain Lake
RegionNA
Data scoreC
Coordinates46.46639, -87.64419
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.