Mine detail: Sherwood Mine

Previously called ''

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Location

Lat / long:

46.10944, -88.64005

Resource(M)

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

Production

Operation type:	Unknown
Deposit type:	Secondary Enrichment
Production size:	Large
Development status:	Past Producer
First production started:	1931
Last production ended:	1979

Geology

Host rock:	Negaunee Iron-Formation
Host type:	Iron Formation
Associated rock:	Stambaugh Formation, Hiawatha Graywacke, Dunn Creek Slate
Structure:	Major troughs; regional trends: E-W, NE-SW, NW-SE, forming triangle., Troughs into which Iron formation has slumped.
Alteration processes:	Chert and siderite to hematite (goethite, limonite) in oxidation zones.

References

MRDS	W001403
DEP	10068376
Reference	{Deposit:: JAMES, H. L., ET. AL., 1968, U. S. G. S. PROF. PAPER 570}{Deposit:: JAMES, H. L., 1955, ZONES OF REGIONAL METAMORPHISM IN THE PRECAMBRIAN OF NORTHERN MICH., G. S. A. BULL., V. 66, P. 1455-1488.}{Deposit:: DUTTON, C. E., P. W. ZIMMER, 1968, IRON ORE DEPOSITS - MENOMINEE DIST., MICH., IN ORE DEP. U. S. 1933-1967, THE GRATON-SALES VOL., J. D. RIDGE, ED., V. 1, P. 538-549.}{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. 122.}{Deposit:: REED, R.C., 1975, ONE THOUSAND MILLION TONS, MICHIGAN IRON ORE SHIPMENTS THROUGH 1974, CIRCULAR 12, GEOLOGICAL SURVEY DIVISION OF MICHIGAN DEPT. OF NATURAL RESOURCES, LANSING, MICHIGAN, 1975. P. 9.}{Deposit:: JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 302-306, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.}{Production:: LAKE SUPERIOR IRON ORES, 1952, P. 122.; SKILLINGS, MAY 1972, V. 61, N. 22, P. 15 AND JUNE 1971, V. 60, N. 26, P. 119.; SKILLINGS, JAN. 27, 1973, V. 62, NO. 4, P. 14}
Reporter	Cannon, Suzanne S., Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)