Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Geco Mine, Gemmell Township, Thunder Bay District, Ontario, Canada

Oldest recorded age at locality: 4000
Youngest recorded age at locality: 2500

mindat Locality ID: 6771
mindat URL: http://www.mindat.org/loc-6771.html

Tectonic Settings: Oceanic Arc (Subduction)

Total number of sublocalities beneath "Geco Mine, Gemmell Township, Thunder Bay District, Ontario, Canada": 0
Total number of bottom-level sublocalities: 0

Latitude: 49°9'19"N
Longitude: 85°47'22"W
Decimal Degree (lat, lon): 49.155277777778,-85.789444444444
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Ag Al C Ca Cl Cu Fe H K Mg Mn Na O Pb S Si Sn Ti Zn Zr 

Elements from minerals reported directly at this locality: Ag Al C Ca Cl Cu Fe H K Mg Mn Na O Pb S Si Sn Ti Zn Zr 

Structural Groups for minerals in this locality: 
AcanthiteAmphiboleBerylCalciteChalcopyriteChloriteClayClinozoisiteCorundumEpidote
EttringiteFeldsparGarnetMicaNickelineNoneNot in a structural groupPyritePyrosmaliteQuartz
RocksaltRutileSphaleriteSpinelStauroliteTitaniteZircon

37 IMA Minerals at location:
Acanthite  (*)Actinolite  (*)Andradite  (*)Anthophyllite  (*)Calcite  (*)
Cassiterite  (*)Chalcopyrite  (*)Cordierite  (*)Corundum  (*)Epidote  (*)
Ferro-actinolite  (*)Ferro-edenite  (*)Ferronigerite-2N1S  (*)Gahnite  (*)Galena  (*)
Gedrite  (*)Hastingsite  (*)Hercynite  (*)Ilmenite  (*)Magnetite  (*)
Microcline  (*)Muscovite  (*)Phlogopite  (*)Pyrite  (*)Pyrosmalite-(Fe)  (*)
Pyrosmalite-(Mn)  (*)Pyrrhotite  (*)Quartz  (*)Rutile  (*)Sillimanite  (*)
Spessartine  (*)Sphalerite  (*)Staurolite  (*)Sudoite  (*)Thaumasite  (*)
Titanite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Acanthite  (*)AcanthiteAg2S2720272002793
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)22720272003419
Andradite  (*)GarnetCa3Fe3+2(SiO4)32720272001534
Anthophyllite  (*)Amphibole   Mg2Mg5Si8O22(OH)2272027200718
Calcite  (*)CalciteCa(CO3)27202720027770
Cassiterite  (*)RutileSnO22720272005171
Chalcopyrite  (*)ChalcopyriteCuFeS227202720027198
Cordierite  (*)BerylMg2Al4Si5O182720272001008
Corundum  (*)CorundumAl2O32720272001797
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)2720272008173
Ferro-actinolite  (*)Amphibole   Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)2272027200129
Ferro-edenite  (*)AmphiboleNaCa2Fe2+5(Si7Al)O22(OH)227202720057
Ferronigerite-2N1S  (*)None(Al,Fe,Zn)2(Al,Sn)6O11(OH)27202720014
Gahnite  (*)SpinelZnAl2O4272027200445
Galena  (*)RocksaltPbS27202720024243
Gedrite  (*)Amphibole   Mg2(Mg3Al2)(Si6Al2)O22(OH)2272027200178
Hastingsite  (*)AmphiboleNaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2272027200209
Hercynite  (*)SpinelFe2+Al2O4272027200407
Ilmenite  (*)CorundumFe2+Ti4+O32720272005433
Magnetite  (*)SpinelFe2+Fe3+2O427202720014899
Microcline  (*)FeldsparK(AlSi3O8)2720272004924
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)227202720017380
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)22720272002273
Pyrite  (*)PyriteFeS227202720039462
Pyrosmalite-(Fe)  (*)Pyrosmalite ClayFe2+8Si6O15(OH)1027202720038
Pyrosmalite-(Mn)  (*)Pyrosmalite ClayMn2+8Si6O15(OH,Cl)1027202720025
Pyrrhotite  (*)NickelineFe7S82720272009056
Quartz  (*)QuartzSiO227202720061156
Rutile  (*)RutileTiO22720272005614
Sillimanite  (*)Not in a structural groupAl2SiO52720272001516
Spessartine  (*)GarnetMn2+3Al2(SiO4)32720272001214
Sphalerite  (*)SphaleriteZnS27202720021482
Staurolite  (*)StauroliteFe2+2Al9Si4O23(OH)272027200978
Sudoite  (*)Chlorite ClayMg2Al3(Si3Al)O10(OH)827202720051
Thaumasite  (*)EttringiteCa3Si(OH)6(CO3)(SO4)·12H2O272027200183
Titanite  (*)TitaniteCaTi(SiO4)O2720272004899
Zircon  (*)ZirconZr(SiO4)2720272005251


3 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
vms-0024727202720Archean       S6771Geco Mine, Gemmell Township, Thunder Bay District, Ontario, CanadaGecoMoiser et al. (2009) USGSOFR2009_1034 
vms-0026940002500Archean     Yes  244258Willroy Mine, Gemmell Township, Thunder Bay District, Ontario, CanadaWillroy No. 1Moiser et al. (2009) USGSOFR2009-1034 
vms-0027040002500Archean     Yes  244258Willroy Mine, Gemmell Township, Thunder Bay District, Ontario, CanadaWillroy No. 3Moiser et al. (2009) USGSOFR2009-1034 

SampleSource LocalityReference URL

All locality data graciously provided by mindat.org

All age data...

Other copyright data...