Silver Islet mine, Silver Islet, Sibley Township, Thunder Bay District, Ontario, Canadai
| Regional Level Types | |
|---|---|
| Silver Islet mine | Mine (Flooded) |
| Silver Islet | - not defined - |
| Sibley Township | Township |
| Thunder Bay District | District |
| Ontario | Province |
| Canada | Country |
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Latitude & Longitude (WGS84):
48° 19' 17'' North , 88° 48' 43'' West
Latitude & Longitude (decimal):
Type:
Mine (Flooded) - last checked 2022
Deposit first discovered:
1868
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Thunder Bay | 99,334 (2018) | 33.1km |
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, baryte 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 Mainland 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.
Map coordinates are for the shafts visible on Google Earth imagery. See also the "Silver Islet" locality page for further historical information.
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, baryte 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 Mainland 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.
Map coordinates are for the shafts visible on Google Earth imagery. See also the "Silver Islet" locality page for further historical information.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
28 valid minerals.
Detailed Mineral List:
| ⓘ Acanthite Formula: Ag2S |
| ⓘ 'Animikite' Habit: Dendritic, massive Colour: Silver tarnishing black Fluorescence: none |
| ⓘ Annabergite Formula: Ni3(AsO4)2 · 8H2O |
| ⓘ Baryte Formula: BaSO4 |
| ⓘ Breithauptite Formula: NiSb |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chlorargyrite Formula: AgCl |
| ⓘ 'Chlorite Group' |
| ⓘ Cobaltite Formula: CoAsS |
| ⓘ Dolomite Formula: CaMg(CO3)2 |
| ⓘ Domeykite Formula: Cu3As |
| ⓘ Erythrite Formula: Co3(AsO4)2 · 8H2O |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Galena Formula: PbS |
| ⓘ Graphite Formula: C |
| ⓘ Gypsum Formula: CaSO4 · 2H2O |
| ⓘ 'Huntilite' |
| ⓘ 'Macfarlanite' |
| ⓘ Marcasite Formula: FeS2 |
| ⓘ Native Mercury Formula: Hg |
| ⓘ Native Silver Formula: Ag |
| ⓘ Nickeline Formula: NiAs |
| ⓘ Pyrargyrite Formula: Ag3SbS3 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS References: |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
| ⓘ Skutterudite Formula: CoAs3 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stephanite Formula: Ag5SbS4 |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
| ⓘ Wurtzite Formula: (Zn,Fe)S |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver | 1.AA.05 | Ag |
| ⓘ | Native Mercury | 1.AD.05 | Hg |
| ⓘ | Graphite | 1.CB.05a | C |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Domeykite | 2.AA.10b | Cu3As |
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Wurtzite | 2.CB.45 | (Zn,Fe)S |
| ⓘ | Breithauptite | 2.CC.05 | NiSb |
| ⓘ | Nickeline | 2.CC.05 | NiAs |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| ⓘ | Cobaltite | 2.EB.25 | CoAsS |
| ⓘ | Skutterudite | 2.EC.05 | CoAs3 |
| ⓘ | Pyrargyrite | 2.GA.05 | Ag3SbS3 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| ⓘ | Stephanite | 2.GB.10 | Ag5SbS4 |
| Group 3 - Halides | |||
| ⓘ | Chlorargyrite | 3.AA.15 | AgCl |
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| ⓘ | Annabergite | 8.CE.40 | Ni3(AsO4)2 · 8H2O |
| ⓘ | Erythrite | 8.CE.40 | Co3(AsO4)2 · 8H2O |
| Unclassified | |||
| ⓘ | 'Animikite' | - | |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Macfarlanite' | - | |
| ⓘ | 'Huntilite' | - | |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Lake SuperiorLake
North America PlateTectonic Plate
- Mid-continent RiftNarrow Rift
This page contains all mineral locality references listed on mindat.org. 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
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References
Chadbourn, Charles Henry (1923) Paragenesis of the ores of the Silver Islet Mine, Thunder Bay region, Lake Superior. Economic Geology, 18 (1) 77-82 doi:10.2113/gsecongeo.18.1.77
Silver Islet mine, Silver Islet, Sibley Township, Thunder Bay District, Ontario, Canada