Montreal Mine (Ottawa; 33 Company Mine; Trimble; Odanah; Moore; Jupiter; Bourne; Sec. 33 Mine), Gogebic Range, Iron Co., Wisconsin, USA

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Ref.: Rocks & Minerals: 59:63, 67, 69-72. 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.
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."
REF:Deposit:: EMATI
Deposit:: SCHMIDT, 1980: USGS BULLETIN 1460
Production:: LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 56-57.
Commodities (Major) - Iron
Development Status: Producer
Deposit Model: 241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
Host Rock Unit: Iron Formation, Ironwood Formation
Structure: N-Dipping Sediments; Regional Trends Are East To West., An E-W Linear Iron Formation Going From Gogebic, Mi, To Ironwood, Mi, And To Mellen, Wi, And A Bit Farther W.
Tectonic Structure: Canadian Shield

Mineral List

Actinolite Baryte Braunite Calcite var: Manganoan Calcite Celestine Dickite

Dolomite Galena Goethite Gypsum var: Selenite Hematite Kaolinite

Magnetite Manganite Marcasite Minnesotaite Neotocite Pyrite Pyrolusite

Quartz Rhodochrosite Romanèchite Siderite Stilpnomelane Talc Vanadinite

28 entries listed. 26 valid minerals.