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George W. MacLeod mine, McMurray Township, Algoma District, Ontario, Canada

Goethite
George W. MacLeod mine, McMurray Township, Algoma District, Ontario, Canada

Photo: John A. Jaszczak
Latitude: 48°0'58"N
Longitude: 84°45'39"W
Multiple ore zones of the Helen Iron Range have operated at different times under a variety of names by the Algoma Steel Corporation and affiliated companies. 1953: Algoma Ore Properties - No. 5 shaft started and reaches 283 (eventually the Macleod production shaft), surface diamond drilling. 1954: Algoma Ore Properties - No. 5 shaft to 1895 feet, 1800 foot long inclined tramway driven and tied to aerial tramway. 1955: Algoma Ore Properties - No. 5 shaft to 2066 feet, tramway extended to 4410 feet. 1956: Algoma Ore Properties - construction of new sintering plant. 1957-59: Algoma Ore Properties - underground tramway extended to 4877 feet, surface diamond drilling. 1960: Algoma Ore Properties - production from old Helen ore body ceases, production from G. W. Macleod Mine begins. 1998: G. W. Macleod Mine closes and mine rehabilitation begins.

The Helen Iron Range is one of 32 separate iron ranges that make up the Michipicoten Iron Formation. This iron formation caps the 2750 Ma volcanic cycle in the Wawa area and represents a period of considerable chemical and clastic sedimentation. The iron range is terminated by the Talbot lake Fault at the west end and the Wallbank lake Fault at the east. The great thickness of the iron formation at its west end is due to tectonic activity along the Talbot Lake Fault which thickened the iron formation by drag folding.
All five facies are developed in this iron formation, however, all mining at the Macleod Mine has taken place in the carbonate (siderite) facies. A chert horizon lies between the siderite and the footwall volcanic rocks. This unit is not observed in any of the other iron ranges. Some chert and argillite has also been reported at the base of the carbonate facies. Their presence may be due to tectonic activity along the Talbot Fault.

Mineral List

Calcite
Dolomite
Galena
Goethite
Grunerite
Hematite
Pyrite
Pyrrhotite
Siderite


9 entries listed. 9 valid minerals.

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References

Rocks & Min.:59:205-207.
Ontario Ministry of Northern Development and Mines MDI Number: MDI42C02SW00004

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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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