Mine detail: Munro Mine

Previously called 'Monroe (?)'

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Location

Lat / long:

45.8, -87.93447

Resource(M)

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

Production

Operation type:	Surface-Underground
Deposit type:	Banded Iron-Rich Sedimentary Deposits
Production size:	Small
Development status:	Past Producer
Production years:	1903-1922 EXCEPT FOR 1914-1915 AND 1921.
First production started:	1903
Last production ended:	1921

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 N
Alteration processes:	Leaching of silica or replacement by iron oxides or a combination of these processes.

References

MRDS	W062043
DEP	10082693
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.E.., AND LEITH, C.E.., 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, D.M. (Cannon, W.F.), Mason Jr., G.T.