Description
A. Randall discovered low-grade magnetic material during the survey of the fourth principal meridian.
Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeBanded Iron-Rich Sedimentary Deposits
Model241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Deposit sizeM
WorkingsUnderground
Orebody formSTRATABOUND
Ore controlOxidation and leaching of unaltered banded-iron formation to soft iron-oxide ore bodies.
Materials
Ore mineralsHematite, Goethite
Geology
Host rockIron Formation · Ironwood Iron-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
AlterationGogebic iron range is in the chlorite metamorphic zone in the least metamorphosed area of the upper peninsula.
Economic & production
Development statusPast Producer
Production years1884 TO AT LEAST 1950. PENOKEE MINE CLOSED IN LATE 1961.
First production1884
Last production1904
Discovery year1848
Identification
Deposit ID10082663
MRDS IDW062012
Alternate namesNorrie-Aurora Group
RegionNA
Data scoreB
Coordinates46.45333, -90.14789
References
SCHMIDT, 1980: USGS BULLETIN 1460. JOHNSON, A.M., AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, GOGEBIC COUNTY, P. 135-140, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 58; REED, 1975