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Porcupine Mine (Creswel; Twin City; Twin Cities Mine), Gillies Township, Thunder Bay District, Ontario, Canadai
Regional Level Types
Porcupine Mine (Creswel; Twin City; Twin Cities Mine)Mine
Gillies TownshipTownship
Thunder Bay DistrictDistrict
OntarioProvince
CanadaCountry

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Latitude & Longitude (WGS84):
48° 18' 28'' North , 89° 39' 48'' West
Latitude & Longitude (decimal):
48.30778,-89.66361
GRN:
N33W43
Type:
Mine
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Neebing1,986(2013)24.1km
Thunder Bay99,334(2018)31.6km
Mindat Locality ID:
18889
Long-form identifier:
mindat:1:2:18889:7
GUID (UUID V4):
0


No description has been added for this locality.Can you add one?

Select Mineral List Type

StandardDetailedGalleryStrunzChemical Elements

Detailed Mineral List:

ⓘAcanthite
Formula:Ag2S
Habit: leaf and nuggets
Description: with wire silver and witherite
ⓘCalcite
Formula:CaCO3
ⓘFluorite
Formula:CaF2
ⓘGalena
Formula:PbS
References:
Frank Karasti
ⓘNative Silver
Formula:Ag
ⓘQuartz
Formula:SiO2
ⓘQuartz var. Amethyst
Formula:SiO2
ⓘQuartz var. Rock Crystal
Formula:SiO2
ⓘQuartz var. Smoky Quartz
Formula:SiO2
ⓘSphalerite
Formula:ZnS
ⓘWitherite
Formula:BaCO3

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
ⓘAcanthite2.BA.35Ag2S
ⓘSphalerite2.CB.05aZnS
ⓘGalena2.CD.10PbS
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘQuartz
var. Amethyst		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘvar. Smoky Quartz4.DA.05SiO2
ⓘvar. Rock Crystal4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘWitherite5.AB.15BaCO3

Other Databases

Ontario Canada Geological SurveyMinfile:MDI52A05SE00010

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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, pleaseregister so you can add to our database. This locality information is for reference purposes only. You should never attempt tovisit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holdersfor access and that you are aware of all safety precautions necessary.

References

Dana 6: 1101.
Sabina, Ann P. (1991) Rocks and minerals for the collector, Sudbury to Winnipeg.Miscellaneous report 49. Geological Survey of Canadap.135
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844.doi:10.2138/am-2024-9486.
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