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Marmoraton Mine, Marmora Township, Hastings Co., Ontario, Canada

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Latitude & Longitude (WGS84): 44° 28' 42'' North , 77° 39' 28'' West
Latitude & Longitude (decimal): 44.47861,-77.65778
Köppen climate type:Dfb : Warm-summer humid continental climate

An iron mine in Precambrian meta-sediments. Started about 1950 and closed 1977. Workings feature an open pit.

1950-1951- 40 diamond drill holes were drilled by Bethlehem Steel Corp for a total of 37,000 feet. 1952-1955 - Removal of 22 million tons of limestone, mine and plant construction by Marmoraton Mining Co. Ltd. 1955-1967 - 6,053,145 tons of ore shipped from open pit 1/2 mile long by 1/4 mile wide. 1978 - mining in the pit ceased.

This deposit was visited on July 24th, 2003. The partially water-filled open pit was viewed at the site. Activity on the site is limited to Canada Talc and Aecon Ltd. Canada Talc is utilizing the mill buildings to upgrade their talc from their mine in Huntingdon Township while Aecon continues to crush and ship the limestone caprock for aggregrate.

Mineral List

25 valid minerals. 1 erroneous literature entry.

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

Middle Ordovician
458.4 - 470 Ma

ID: 610896
Ottawa Group; Simcoe Group; Shadow Lake Formation

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Ottawa Group; Simcoe Group; Shadow Lake Formation


Lithology: Limestone, dolostone, shale, arkose, sandstone

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: 207-208.
SABINA, A.P. (1970): Rocks & minerals for the collector: Hull – Maniwaki, Quebec; Ottawa – Peterborough, Ontario. Geological Survey of Canada, Paper 69-50, 141p. Reissued in 1987 as Geological Survey of Canada, Miscellaneous Report 41, 141p.
George Robinson Mineral. Record, 13 (2), 73-75.

- catalogue #3402CL, Lemanski collection.

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