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Robertsville Mine (Mississippi Mine), Palmerston Township, Frontenac Co., Ontario, Canada

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Latitude & Longitude (WGS84): 44° 54' 7'' North , 76° 40' 37'' West
Latitude & Longitude (decimal): 44.90194,-76.67694

At contact of crystalline limestone and gneiss.

"The deposit was worked by open pits, the largest measuring 15 by 30 and 60 m deep. The smaller pits are now overgrown. The mine was worked between 1880 and 1895; 27,210 to 36,280 t of ore were shipped to the U.S. Exploratory. Work was conducted on the property in 1951 by Trent River Iron Limited."


1880s: owned and operated by the Mississippi Mining Company Limited. Late 1880s: some work was performed by Kingston and Pembroke Mining Company. 1899: mine was operated on lease from H.A. Ferguson of Kingston to F.W. Schwendiman and Thomas Barnes. Some diamond drilling, widening, deepening and dewatering of the pit were performed and the ore production was resumed. 1918 and 1919 property briefly worked by the Poe Mining Company.
Mid-1920s: 5 ton sample of crude ore from the Robertsville (Mississippi) Mine waste dump tested by the Mines Branch, Department of Mines,Ottawa. 1951: dip needle survey was conducted by Minnesota-Huron Mining Company and 2 diamond-drill holes were drilled by Trent River Iron Limited.

Mineral List

8 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

Neoproterozoic - Mesoproterozoic
541 - 1600 Ma
Mafic to ultramafic plutonic rocks

Age: Proterozoic (541 - 1600 Ma)

Comments: Grenville Province Central Metasedimentary Belt

Lithology: Diorite, gabbro, peridotite, pyroxenite, anorthosite, derived metamorphic rocks

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.


Dana 6: 471.

Elfric Drew Ingall (1901) Report on the iron ore deposits along the Kingston and Pembroke railway in Eastern Ontario.Geological Survey of Canada Part 1 Annual Report, Vol XII

MDI Number: MDI31C15NE00005

Ann P.Sabina (1987), Rocks and Minerals for the Collector, Hull-Maniwaki, Quebec; Ottawa-Peterborough, Ontario. GSC Misc. Report 41, p.67

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