Mine detail: Ravenna Mine

Previously called 'QuincyBristol'

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Location

Lat / long:

46.10611, -88.35198

Resource(M)

Primary:	Iron
Ore:	Hematite, Goethite
Gangue:	Chert, Pyrite, Siderite, Stilpnomelane, Chlorite, Mica

Production

Operation type:	Underground
Deposit type:	Secondary Enrichment
Production size:	Unknown
Development status:	Past Producer
First production started:	1911
Last production ended:	1917

Geology

Host rock:	Riverton Iron-Formation
Host type:	Iron Formation
Alteration processes:	Chert and siderite to hematite and goethite in oxidation zones

References

MRDS	W028628
DEP	10079372
Reference	{Deposit:: JAMES, H.L., DUTTON, C.E., PETTIJOHN, F.J., WIER, K.L., 1968, GEOLOGY AND ORE DEPOSITS OF THE IRON RIVER, CRYSTAL FALLS DISTRICT, IRON COUNTY, MICHIGAN. WASHINGTON, U.S. GOVT. PRINTING OFFICE, 1968. PP. 45-56, 88-110.}{Deposit:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, LAKE SUPERIOR IRON ORES (2ND ED.): CLEVELAND, OHIO. P. 121.}{Deposit:: CROWELL, BENEDICT, AND MURRAY, C.B. INC., 1914, 1917, THE IRON ORES OF LAKE SUPERIOR (2ND, 3RD EDS.): CLEVELAND, OHIO. P. 213, 269-270 RESPECTIVLY.}{Deposit:: JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 282-285, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}
Reporter	Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)