Mine detail: Berkshire Mine

Previously called ''

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Location

Lat / long: 46.06417, -88.61588

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: 1908
Last production ended: 1943

Geology

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

References

MRDSW028953
DEP10079420
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. 108.}{Deposit:: CROWELL, BENEDICT, AND MURRAY, C.B., INC., 1911, 1914, 1917, 1920, 1923, 1927, 1930, THE IRON ORES OF LAKE SUPERIOR (1ST-7TH ED.): CLEVELAND, OHIO. PP. 104, 187, 241-242, 218-219, 268-269, 288-289, 258-259 RESPECTIVLY.}{Deposit:: JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 28-32, MICHIGAN DEPARTMENT OF NATURAL RESOURCES,}
ReporterYeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)