Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Deposit sizeM
Ore controlStructurally controlled on synclinal flank.
Materials
Ore mineralsHematite, Goethite
GangueChert, Pyrite, Siderite, Stilpnomelane, Chlorite, Mica
Geology
Host rockIron Formation
AlterationChert and siderite to hematite and goethite in oxidation zones.
Economic & production
Development statusPast Producer
First production1887
Last production1915
Identification
Deposit ID10079382
MRDS IDW028642
Alternate namesDunn-Richards Mine;
RegionNA
Data scoreB
Coordinates46.07139, -88.37448
References
JAMES, H.L., DUTTON, C.E., PETTIJOHN, F.T., 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.CROWELL, BENEDICT, AND MURRAY, C.B., INC., 1911, 1914, 1917, THE IRON ORES OF LAKE SUPERIOR (1ST, 2ND, 3RD EDS.): CLEVELAND, OHIO. PP. 111-112, 194-195, 250 RESPECTIVELY.LAKE SUPERIOR IRON ORE ASSOCIATION, 1938, LAKE SUPERIOR IRON ORES (1ST ED.): CLEVELAND, OHIO. P. 158.JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 140-142, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.