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Silver Islet mine, Silver Islet, Sibley Township, Thunder Bay District, Ontario, Canada

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Latitude & Longitude (WGS84): 48° 19' 16'' North , 88° 48' 40'' West
Latitude & Longitude (decimal): 48.32111,-88.81111
Köppen climate type:Dfb : Warm-summer humid continental climate

A tiny island in Lake Superior.

The Silver Islet mine was located on a very small, rocky islet just off shore in Lake Superior. To accommodate the workings the islet's size had to be increased with bulkheads and fill. The Silver islet ore deposit was the most productive in the Thunder Bay District and was in the “Island Group”, one of three groups of metalliferous vein ore deposits (Franklin, et al, 1986). The veins of the “Mainland” and “Port Coldwell” groups contain quite simple mineral assemblages including the common sulphides, silver, acanthite, quartz, calcite, barite and fluorite. However, the Silver Islet and Edwards Island deposits are characterized by a five element mineral assemblage, ie. Ag-Co-Ni-As-Bi. The mineral assemblages present in other ore deposits in the Island group appear simple and similar to those of the Mianland group. However, Franklin, et al (1986) note that the other ore deposits are poorly known and that the Silver Islet vein system contains significant areas of simple mineralogy.

Mineral List

28 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


ID: 3185648

Age: Anthropocene ( Ma)

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

1000 - 1600 Ma

ID: 612493
Sibley Gp. (circa 1.34 Ga)

Age: Mesoproterozoic (1000 - 1600 Ma)

Stratigraphic Name: Sibley Group

Comments: Southern and Superior Province

Lithology: Conglomerate, sandstone, shale

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.


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Franklin,JM, Kissin,SA, Smyk,MC and Scott,SD (1986) Silver deposits associated with the Proterozoic rocks of the Thunder Bay district, Ontario. In `Silver Vein Deposits', a symposium held at the GAC/MAC London meeting in 1984, publ. in Can.J.Earth Sci. 23 no.10, pp.1460-1640, 1576-1591.
Wilson, W.E. (1986). Famous mineral localities: the Silver Islet mine, Ontario. Mineralogical Record, 17, 49-60.

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