Commodities
PrimaryIron
Commodity typeM
Deposit
Deposit typeSecondary Enrichment
Model241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Deposit sizeU
Ore controlStructurally controlled on anticlinal flank.
Materials
Ore mineralsHematite, Goethite
GangueChert, Pyrite, Siderite, Stilpnomelane, Chlorite, Mica
Geology
Host rockIron Formation · Riverton Iron-Formation
AlterationChert and siderite to hematite and goethite in oxidation zones.
Economic & production
Development statusPast Producer
First production1913
Last production1927
Identification
Deposit ID10079370
MRDS IDW028626
Alternate namesDunn-Richards Mine
RegionNA
Data scoreB
Coordinates46.07333, -88.37393
References
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.LAKE SUPERIOR IRON ORE ASSOCIATION, 1938, LAKE SUPERIOR IRON ORES (1ST ED.): CLEVELAND, OHIO. P. 162.CROWELL, BENEDICT, AND MURRAY, C.B., INC. 1917, 1920, 1923, THE IRON ORES OF LACROWELL, BENEDICT, AND MURRAY, C.B., INC. 1917, 1920, 1923, THE IRON ORES OF LAKE SUPERIOR (2ND, 3RD 4TH EDS.): CLEVELAND, OHIO. PP. 270, 243, 292-293 RESPECTIVLY.JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 137-139, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.