Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeChemical Sedimentary: Replacement
Deposit sizeL
WorkingsSurface
Orebody formTABULAR: MASSIVE
Ore controlFaulting: bedding
Materials
Ore mineralsMagnetite
GangueChert, Biotite, Quartz, Chlorite, Olivine, Pyrite
Geology
Host rockIron Formation · Negaunee Iron-Formation
Associated rock"Siamo Slate", "Ajibik Quartzite"
StructureMarquette syncline, about 33 miles long and open at the western end. Begin, Monoclinal fold dipping 35 deg. nw.
AlterationIn chlorite zone, near biotite isograd.
Economic & production
Development statusProducer
First production1907
Identification
Deposit ID10107262
MRDS IDW001394
Alternate namesPalmer Operations
RegionNA
Data scoreB
Coordinates46.45611, -87.60558
References
JAMES, H. L., 1955, ZONES OF REG. METAMORPHISM. IN THE PRECAMBRIAN OF NO. MICH. G. S. A. BULL., VOL. 66, P. 1455 - 1488.LAKE SUPERIOR IRON ORE ASSOC., 1938, LAKE SUPERIOR IRON ORES.LAKE SUPERIOR IRON ORE ASSOC., 1952, LAKE SUPERIOR IRON ORES.VAN HISE AND BAYLEY, 1897, U. S. G. S. MONOGRAPH 28.U.S. BUREAU OF MINES, 1954-1994, MINERALS YEARBOOK [1953-1993]: WASHINGTON, D.C., U. S. GOVERNMENT PRINTING OFFICE,1969 GEOL MAP J. GAIRLAKE SUPERIOR IRON ORES 1938 AND 1952, P. 106; P. 80. MINERALS YEARBOOKS FOR APPROPRIATE YEARS.MINERALS YEARBOOK 1989, V. II.