Mine detail: Lake Superior Group

Previously called 'Hard OreHematiteHolmesSection 16Section 21Section 10 ExplorationHolmes-Section 16'

<< Back to the map

Location

Lat / long:

46.4825, -87.67585

Resource(M)

Primary:	Iron
Ore:	Hematite, Magnetite, Goethite
Gangue:	Quartz
Orebody form:	STRATABOUND
Discovery year:	1844

Production

Operation type:	Underground
Deposit type:	Bedded, Chemical Sediment
Production size:	Medium
Development status:	Past Producer
Production years:	SHIPMENTS WERE MADE FOR SOME MINES IN THE GROUP EVERY YEAR FROM 1858 TO 1945 EXCEPT FOR 1932, 1938, AND 1944.
First production started:	1858
Last production ended:	1945

Geology

Host rock:	Negaunee Iron-Formation
Host type:	Iron Formation
Structure:	Westward plunging synclinorium open at western end; regional trends are eas
Alteration processes:	Some magnetite formed by replacement of ferrous iron minerals during diagenesis and most iron silicate probably formed by metamorphism of an early silicate mineral.

References

MRDS	W062099
DEP	10082749
Reference	{Deposit:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES, 2D ED.: CLEVELAND, OHIO, LAKE SUPERIOR IRON ORE ASSOCIATION, 334 P.}{Deposit:: MOST ALL OF THIS DISTRICT HAS BEEN MAPPED AT 7 1/2 MINUTE QUADRANGLE SIZE. TOO MANY GEOLOGISTS HAVE BEEN INVOLVED TO MENTION INDIVIDUALLY. GAIR, J.E., 1975, BEDROCK GEOLOGY AND ORE DEPOSITS OF THE PALMER QUADRANGLE, MARQUETTE COUNTY, MICHIGAN: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 769, 159 P.}{Production:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES: CLEVELAND, OHIO, 2D ED., 75-92 P.}
Reporter	Sutphin, D.M. (Cannon, W.F.), Mason Jr., G.T.