Mine detail: Crystal Falls Mine

Location:	Iron County, Michigan, United States, North America
Lat / long:	46.11111, -88.30615
dep_id:	10079384
mrds_id:	W028644
Commodity type:	metallic
Major mineral:	Iron
Operation type:	Underground
Deposit type:	Secondary Enrichment
Production size:	Unknown
Development status:	Past Producer
ore:	Hematite, Goethite
gangue:	Chert, Pyrite, Siderite, Stilpnomelane, Chlorite, Mica
model:	241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
alteration:	Chert and siderite to hematite and goethite in oxidation zones.
ore_ctrl:	Structurally controlled on synclinal flank.
Reporter:	Yeager, Keith (Cannon, W.), Sutphin, D.M., Mason Jr., G.T., Anderson, Arlene (M. Gere)
hrock_type:	Iron Formation
Year first produced:	1890
yr_lst_prd:	1913
References:	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. 112. Deposit:: CROWELL, BENEDICT, AND MURRAY, C.B., INC., 1911, THE IRON ORES OF LAKE SUPERIOR (1ST ED.): CLEVELAND, OHIO. PP. 108-109 Deposit:: HANNA, T.A., 1962, STATE OF MICHIGAN MINES AND MINERAL STATISTICS, MARQUETTE, MICHIGAN. P. 80. Deposit:: JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, IRON COUNTY, P. 104-106, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.