Mine detail: Empire Mine

Previously called 'Palmer Operations'

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Location

Lat / long:

46.45611, -87.60558

Resource(M)

Primary:	Iron
Ore:	Magnetite
Gangue:	Chert, Biotite, Quartz, Chlorite, Olivine, Pyrite
Orebody form:	TABULAR: MASSIVE

Production

Operation type:	Unknown
Deposit type:	Chemical Sedimentary: Replacement
Production size:	Large
Development status:	Producer
First production started:	1907

Geology

Host rock:	Negaunee Iron-Formation
Host type:	Iron Formation
Associated rock:	Siamo Slate, Ajibik Quartzite
Structure:	Marquette syncline, about 33 miles long and open at the western end. Begin, Monoclinal fold dipping 35 deg. nw.
Alteration processes:	In chlorite zone, near biotite isograd.

References

MRDS	W001394
DEP	10107262
Reference	{Deposit:: JAMES, H. L., 1955, ZONES OF REG. METAMORPHISM. IN THE PRECAMBRIAN OF NO. MICH. G. S. A. BULL., VOL. 66, P. 1455 - 1488.}{Deposit:: LAKE SUPERIOR IRON ORE ASSOC., 1938, LAKE SUPERIOR IRON ORES.}{Deposit:: LAKE SUPERIOR IRON ORE ASSOC., 1952, LAKE SUPERIOR IRON ORES.}{Deposit:: VAN HISE AND BAYLEY, 1897, U. S. G. S. MONOGRAPH 28.}{Deposit:: U.S. BUREAU OF MINES, 1954-1994, MINERALS YEARBOOK [1953-1993]: WASHINGTON, D.C., U. S. GOVERNMENT PRINTING OFFICE,}{Deposit:: 1969 GEOL MAP J. GAIR}{Production:: LAKE SUPERIOR IRON ORES 1938 AND 1952, P. 106; P. 80. MINERALS YEARBOOKS FOR APPROPRIATE YEARS.}{Reserve-Resource:: MINERALS YEARBOOK 1989, V. II.}
Reporter	Cannon, Suzanne S., Sutphin, D.M. (Cannon, W.F.), Mason Jr., G.T.