Mine detail: Florence Mine

Previously called 'Eagle'

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Location

Lat / long:

45.92583, -88.2631

Resource(M)

Primary:	Iron
Ore:	Goethite, Hematite, Magnetite
Gangue:	Quartz
Orebody form:	STRATABOUND
Discovery year:	1849

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
Production years:	1880-1931 EXCEPT FOR 1884-1885, 1913, 1921-1922, 1924, AND 1926-1928.
First production started:	1880
Last production ended:	1931

Geology

Host rock:	Vulcan Iron Formation
Host type:	Iron Formation
Structure:	Major Troughs Into Which Iron Fm. Has Slumped; Regional Trends Are E-W To Ne-Sw.
Tectonic:	Canadian Shield
Alteration processes:	Leaching Of Silica Or Replacement By Iron Oxides Or A Combination Of These Processes.

References

MRDS	W062031
DEP	10082682
Reference	{Deposit:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES, 2D ED.: CLEVELAND, OHIO, LAKE SUPERIOR IRON ORE ASSOCIATION, 334 P}{Deposit:: BAYLEY, R.W., AND OTHERS, 1966, GEOLOGY OF THE MENOMINEE IRON-BEARING DISTRICT, MICHIGAN AND WISCONSIN: U.S.G.S. PROFESSIONAL PAPER 513, 96 P. VAN HISE, C.R., AND LEITH, C.K., 1911, THE GEOLOGY OF THE LAKE SUPERIOR REGION: U.S.G.S MONOGRAPH 52, 641 P}{Production:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 107-128.}
Reporter	Sutphin, David M. (Cannon, W. F.), Mason Jr., G.T.