Description
A. Randall Discovered Low-Grade Magnetic Material During The Survey Of The Fourth Principal Meridian.
Commodities
PrimaryIron
Commodity typeM
Deposit
Model241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Deposit sizeS
WorkingsUnderground
Orebody formSTRATABOUND
Ore controlOxidation And Leaching Of Unaltered Banded-Iron Formation To Soft Iron-Oxide Ore Bodies.
Materials
Ore mineralsGoethite, Hematite
Geology
Host rockIron Formation · Ironwood Formation
StructureN-Dipping Sediments; Regional Trends Are East To West., An E-W Linear Iron Formation Going From Gogebic, Mi, To Ironwood, Mi, And To Mellen, Wi, And A Bit Farther W.
Tectonic settingCanadian Shield
AlterationGogebic Iron Range Is In The Chlorite Metamorphic Zone In The Least Metamorphosed Area Of The Upper Peninsula.
Economic & production
Development statusPast Producer
Production years1887 TO 1913 EXCEPT FOR 1888-1894, AND 1911.
First production1887
Last production1913
Discovery year1848
Identification
Deposit ID10082654
MRDS IDW062002
Alternate namesTracts., Atlas, Laura, And Ryan
RegionNA
Data scoreB
Coordinates46.40306, -90.3079
References
HEYL, A.V., JR., AGNEW, A.F., LYONS, E.J., AND BEHRE, C.H., JR., WITH SPECIAL SECTIONS BY FLINT, A.E., 1959, THE GEOLOGY OF THE UPPER MISSISSIPPI VALLEY ZINC-LEAD DISTRICT: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 309, 310 PSCHMIDT, 1980: USGS BULLETIN 1460LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 53.