Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Deposit sizeS
Ore controlUpward facing or open structures of folding or faulting
Materials
Ore mineralsLimonite, Grunerite
GangueChert, Magnetite, Hornblende, Actinolite, Garnet, Mica
Geology
Host rockIron Formation · Bijiki Iron-Formation
AlterationReplacement of cherty beds by iron oxide and alteration of fe-silicates and carbonates to iron oxides
Economic & production
Development statusPast Producer
First production1887
Last production1888
Identification
Deposit ID10079319
MRDS IDW028541
Alternate namesNorthrup
RegionNA
Data scoreB
Coordinates46.53806, -88.1706
References
KLASNER, J. S., AND CANNON, W. F., 1978 , BEDROCK GEOLOGY OF THE SOUTHERN PART OF THE MICHIGAMME AND THREE LAKES QUADRANGLES, MARQUETTE AND BARAGA COUNTIES, MICHIGAN, USGS MAP 1 - 1078 .LAKE SUPERIOR IRON ORE ASSOCIATION, 1938 , LAKE SUPERIOR IRON ORES ( 1ST ED. ): CLEVELAND, OHIO, P. 115 .SECTION FILES, MICHIGAN GEOLOGICAL SURVEY, CLEVELAND-CLIFFS IRON CO, OHIO MINE EXPLORATION, 1950 - 1951 , SECTION FILES OF THE GEOLOGICAL SURVEY DIVISION OF MICHIGAN DEPT. OF NATURAL RESOURCES.JOHNSON, A., 1998, INVENTORY OF UNDERGROUND MINES, BARAGA COUNTY, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.