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

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Latitude & Longitude (WGS84): 48° 0' 58'' North , 84° 45' 39'' West
Latitude & Longitude (decimal): 48.01611,-84.76083

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

9 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Neoarchean - Mesoarchean
2500 - 3200 Ma
Felsic to intermediate metavolcanic rocks

Age: Archean (2500 - 3200 Ma)

Comments: Superior Province

Lithology: Rhyolitic, rhyodacitic flows, tuffs and breccias

Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. [1]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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

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