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Montreal Mine (Ottawa; 33 Company Mine; Trimble; Odanah; Moore; Jupiter; Bourne; Sec. 33 Mine), Gogebic Range, Iron Co., Wisconsin, USA
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Latitude: 46°25'40"N
Longitude: 90°14'45"W
 
 
An iron mine located near Montreal, just west of Hurley. Closed before 1967. Workings featured the #4, #5 & #6 shafts; 20th., 37th., 38th. & 42nd. levels. Sec 33 T46N R2E. It is in a classic Proerozoic banded iron formation (the Ironwood Formation) that forms the Gogebic Iron Range. The iron formation strikes NE-SW and dips north. It is cross-cut by diabasic dikes, which have localized a number of oxidized zone in the iron formation with large open pockets filled with a variety of minerals. It holds the record still for deepest underground iron mine in the world.

Excerpt from a AIME Report published 1/1/1940:
"The Montreal mine, operated by the Montreal Mining Co., is four miles west of Ironwood, Mich., in Iron County, Wisconsin. It is the westernmost producing property on the Gogebic Iron Range of the Lake Superior district. Its production is 4000 tons of hematite per day from an average depth of 2300 ft. This tonnage is hoisted through a five-compartment vertical shaft. Several mining methods are in use but in the larger orebodies the method is sublevel caving. ORE Occurrence and Chaeacteristics The main orebodies of the Montreal mine lie in eastward-pitching troughs formed by the intersections of intrusive dikes with impervious members of the iron formation. The formation has an average width of 425 ft., strikes east and west and dips north at approximately 62. The dikes dip south at 45° and bear north 20' from the strike of the formation, making the intersections with various members pitch east at 16°. The dikes are not continuous across the formation but are interrupted by a longitudinal bedding fault, which has a throw of 380 ft. vertically and 885 ft. horizontally. North of the fault zone the formation is called "hanging," south it is called "footwall" formation. The faulting has created two ore-bearing horizons; viz., at the intersection of banging dikes with the slate members and the foot dikes with the quartzite footwall. In each formation the main ore-bearing member consists of wavy beds of hard chert interlaid with hematite. In the most productive part of the mine, where the sublevel caving method is employed, a hanging-formation dike lies in juxtaposition with a footwall dike and the iron formation carries ore in certain sections from the quartzite footwall to the hanging dike. Here a horizontal section of the orebody may be 300 to 400 ft. wide for a length of 150 ft. or more and tail out lengthwise in both the foot and hanging formations. The footwall ore section is much longer than the hanging wall because of the orebody's greater height above the "pitching dike."

Mineral List

Actinolite
Analcime
Baryte
Braunite
Calcite
var: Manganoan Calcite
Celestine
Cryptomelane
Dickite
Dolomite
Galena
Goethite
Gypsum
var: Selenite
Hematite
Hollandite
Kaolinite
Kutnohorite
Magnetite
Manganite
Marcasite
Minnesotaite
Neotocite
Pyrite
Pyrolusite
Quartz
Rhodochrosite
Romanèchite
Siderite
Stilpnomelane
Talc
Vanadinite


32 entries listed. 30 valid minerals.

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References

Dickey, R. M. (1938): Manganese in the Montreal Mine, Montreal, Wisconsin: Economic Geology, 33: 600-624.

Lake Superior Iron Ore Association (1952), Lake Superior iron ores: mining directory and statistics: 56-57.

La Berge, G. (1984) The Geologic History of Wisconsin: Rocks and Minerals 59 (2), 60-73.

Schmidt, R G. (1980): The Marquette Range Supergroup in the Gogebic iron district, Michigan and Wisconsin: U. S. Geological Survey Bulletin 1460, 96 p.

Robinson, G. & G. LaBerge (2013) Minerals of the Lake Superior Iron Ranges: A. E. Seaman Mineral Museum: Michigan Technological University, 52 p.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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