Mine detail: Columbia Mine

Previously called 'Shafer MineSheldon & Shafer MineUnion MineChafter Mine'

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Location

Lat / long:

46.08667, -88.35865

Resource(M)

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

Production

Operation type:	Surface-Underground
Deposit type:	Secondary Enrichment
Production size:	Unknown
Development status:	Past Producer
First production started:	1882
Last production ended:	1963

Geology

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

References

MRDS	W028645
DEP	10106113
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.111.}{Deposit:: JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MIINES, IRON COUNTY, P. 90-94, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}
Reporter	Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)